1. 05 Apr, 2018 4 commits
    • Dominik Brodowski's avatar
      syscalls/core: Prepare CONFIG_ARCH_HAS_SYSCALL_WRAPPER=y for compat syscalls · 7303e30e
      Dominik Brodowski authored
      It may be useful for an architecture to override the definitions of the
      COMPAT_SYSCALL_DEFINE0() and __COMPAT_SYSCALL_DEFINEx() macros in
      <linux/compat.h>, in particular to use a different calling convention
      for syscalls. This patch provides a mechanism to do so, based on the
      previously introduced CONFIG_ARCH_HAS_SYSCALL_WRAPPER. If it is enabled,
      <asm/sycall_wrapper.h> is included in <linux/compat.h> and may be used
      to define the macros mentioned above. Moreover, as the syscall calling
      convention may be different if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is set,
      the compat syscall function prototypes in <linux/compat.h> are #ifndef'd
      out in that case.
      
      As some of the syscalls and/or compat syscalls may not be present,
      the COND_SYSCALL() and COND_SYSCALL_COMPAT() macros in kernel/sys_ni.c
      as well as the SYS_NI() and COMPAT_SYS_NI() macros in
      kernel/time/posix-stubs.c can be re-defined in <asm/syscall_wrapper.h> iff
      CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/20180405095307.3730-5-linux@dominikbrodowski.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      7303e30e
    • Dominik Brodowski's avatar
      syscalls/x86: Use 'struct pt_regs' based syscall calling convention for 64-bit syscalls · fa697140
      Dominik Brodowski authored
      Let's make use of ARCH_HAS_SYSCALL_WRAPPER=y on pure 64-bit x86-64 systems:
      
      Each syscall defines a stub which takes struct pt_regs as its only
      argument. It decodes just those parameters it needs, e.g:
      
      	asmlinkage long sys_xyzzy(const struct pt_regs *regs)
      	{
      		return SyS_xyzzy(regs->di, regs->si, regs->dx);
      	}
      
      This approach avoids leaking random user-provided register content down
      the call chain.
      
      For example, for sys_recv() which is a 4-parameter syscall, the assembly
      now is (in slightly reordered fashion):
      
      	<sys_recv>:
      		callq	<__fentry__>
      
      		/* decode regs->di, ->si, ->dx and ->r10 */
      		mov	0x70(%rdi),%rdi
      		mov	0x68(%rdi),%rsi
      		mov	0x60(%rdi),%rdx
      		mov	0x38(%rdi),%rcx
      
      		[ SyS_recv() is automatically inlined by the compiler,
      		  as it is not [yet] used anywhere else ]
      		/* clear %r9 and %r8, the 5th and 6th args */
      		xor	%r9d,%r9d
      		xor	%r8d,%r8d
      
      		/* do the actual work */
      		callq	__sys_recvfrom
      
      		/* cleanup and return */
      		cltq
      		retq
      
      The only valid place in an x86-64 kernel which rightfully calls
      a syscall function on its own -- vsyscall -- needs to be modified
      to pass struct pt_regs onwards as well.
      
      To keep the syscall table generation working independent of
      SYSCALL_PTREGS being enabled, the stubs are named the same as the
      "original" syscall stubs, i.e. sys_*().
      
      This patch is based on an original proof-of-concept
      
       | From: Linus Torvalds <torvalds@linux-foundation.org>
       | Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
      
      and was split up and heavily modified by me, in particular to base it on
      ARCH_HAS_SYSCALL_WRAPPER, to limit it to 64-bit-only for the time being,
      and to update the vsyscall to the new calling convention.
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/20180405095307.3730-4-linux@dominikbrodowski.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      fa697140
    • Dominik Brodowski's avatar
      syscalls/core: Introduce CONFIG_ARCH_HAS_SYSCALL_WRAPPER=y · 1bd21c6c
      Dominik Brodowski authored
      It may be useful for an architecture to override the definitions of the
      SYSCALL_DEFINE0() and __SYSCALL_DEFINEx() macros in <linux/syscalls.h>,
      in particular to use a different calling convention for syscalls.
      
      This patch provides a mechanism to do so: It introduces
      CONFIG_ARCH_HAS_SYSCALL_WRAPPER. If it is enabled, <asm/sycall_wrapper.h>
      is included in <linux/syscalls.h> and may be used to define the macros
      mentioned above. Moreover, as the syscall calling convention may be
      different if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is set, the syscall function
      prototypes in <linux/syscalls.h> are #ifndef'd out in that case.
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/20180405095307.3730-3-linux@dominikbrodowski.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      1bd21c6c
    • Linus Torvalds's avatar
      x86/syscalls: Don't pointlessly reload the system call number · dfe64506
      Linus Torvalds authored
      We have it in a register in the low-level asm, just pass it in as an
      argument rather than have do_syscall_64() load it back in from the
      ptregs pointer.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/20180405095307.3730-2-linux@dominikbrodowski.netSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      dfe64506
  2. 03 Apr, 2018 7 commits
    • Linus Torvalds's avatar
      Merge branch 'syscalls-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux · 642e7fd2
      Linus Torvalds authored
      Pull removal of in-kernel calls to syscalls from Dominik Brodowski:
       "System calls are interaction points between userspace and the kernel.
        Therefore, system call functions such as sys_xyzzy() or
        compat_sys_xyzzy() should only be called from userspace via the
        syscall table, but not from elsewhere in the kernel.
      
        At least on 64-bit x86, it will likely be a hard requirement from
        v4.17 onwards to not call system call functions in the kernel: It is
        better to use use a different calling convention for system calls
        there, where struct pt_regs is decoded on-the-fly in a syscall wrapper
        which then hands processing over to the actual syscall function. This
        means that only those parameters which are actually needed for a
        specific syscall are passed on during syscall entry, instead of
        filling in six CPU registers with random user space content all the
        time (which may cause serious trouble down the call chain). Those
        x86-specific patches will be pushed through the x86 tree in the near
        future.
      
        Moreover, rules on how data may be accessed may differ between kernel
        data and user data. This is another reason why calling sys_xyzzy() is
        generally a bad idea, and -- at most -- acceptable in arch-specific
        code.
      
        This patchset removes all in-kernel calls to syscall functions in the
        kernel with the exception of arch/. On top of this, it cleans up the
        three places where many syscalls are referenced or prototyped, namely
        kernel/sys_ni.c, include/linux/syscalls.h and include/linux/compat.h"
      
      * 'syscalls-next' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/linux: (109 commits)
        bpf: whitelist all syscalls for error injection
        kernel/sys_ni: remove {sys_,sys_compat} from cond_syscall definitions
        kernel/sys_ni: sort cond_syscall() entries
        syscalls/x86: auto-create compat_sys_*() prototypes
        syscalls: sort syscall prototypes in include/linux/compat.h
        net: remove compat_sys_*() prototypes from net/compat.h
        syscalls: sort syscall prototypes in include/linux/syscalls.h
        kexec: move sys_kexec_load() prototype to syscalls.h
        x86/sigreturn: use SYSCALL_DEFINE0
        x86: fix sys_sigreturn() return type to be long, not unsigned long
        x86/ioport: add ksys_ioperm() helper; remove in-kernel calls to sys_ioperm()
        mm: add ksys_readahead() helper; remove in-kernel calls to sys_readahead()
        mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff()
        mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64()
        fs: add ksys_fallocate() wrapper; remove in-kernel calls to sys_fallocate()
        fs: add ksys_p{read,write}64() helpers; remove in-kernel calls to syscalls
        fs: add ksys_truncate() wrapper; remove in-kernel calls to sys_truncate()
        fs: add ksys_sync_file_range helper(); remove in-kernel calls to syscall
        kernel: add ksys_setsid() helper; remove in-kernel call to sys_setsid()
        kernel: add ksys_unshare() helper; remove in-kernel calls to sys_unshare()
        ...
      642e7fd2
    • Omar Sandoval's avatar
      bitmap: fix memset optimization on big-endian systems · 21035965
      Omar Sandoval authored
      Commit 2a98dc02 ("include/linux/bitmap.h: turn bitmap_set and
      bitmap_clear into memset when possible") introduced an optimization to
      bitmap_{set,clear}() which uses memset() when the start and length are
      constants aligned to a byte.
      
      This is wrong on big-endian systems; our bitmaps are arrays of unsigned
      long, so bit n is not at byte n / 8 in memory.  This was caught by the
      Btrfs selftests, but the bitmap selftests also fail when run on a
      big-endian machine.
      
      We can still use memset if the start and length are aligned to an
      unsigned long, so do that on big-endian.  The same problem applies to
      the memcmp in bitmap_equal(), so fix it there, too.
      
      Fixes: 2a98dc02 ("include/linux/bitmap.h: turn bitmap_set and bitmap_clear into memset when possible")
      Fixes: 2c6deb01 ("bitmap: use memcmp optimisation in more situations")
      Cc: stable@kernel.org
      Reported-by: ernsteiswuerfel's avatar"Erhard F." <erhard_f@mailbox.org>
      Cc: Matthew Wilcox <mawilcox@microsoft.com>
      Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      21035965
    • Linus Torvalds's avatar
      Merge tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic · f5a8eb63
      Linus Torvalds authored
      Pul removal of obsolete architecture ports from Arnd Bergmann:
       "This removes the entire architecture code for blackfin, cris, frv,
        m32r, metag, mn10300, score, and tile, including the associated device
        drivers.
      
        I have been working with the (former) maintainers for each one to
        ensure that my interpretation was right and the code is definitely
        unused in mainline kernels. Many had fond memories of working on the
        respective ports to start with and getting them included in upstream,
        but also saw no point in keeping the port alive without any users.
      
        In the end, it seems that while the eight architectures are extremely
        different, they all suffered the same fate: There was one company in
        charge of an SoC line, a CPU microarchitecture and a software
        ecosystem, which was more costly than licensing newer off-the-shelf
        CPU cores from a third party (typically ARM, MIPS, or RISC-V). It
        seems that all the SoC product lines are still around, but have not
        used the custom CPU architectures for several years at this point. In
        contrast, CPU instruction sets that remain popular and have actively
        maintained kernel ports tend to all be used across multiple licensees.
      
        [ See the new nds32 port merged in the previous commit for the next
          generation of "one company in charge of an SoC line, a CPU
          microarchitecture and a software ecosystem"   - Linus ]
      
        The removal came out of a discussion that is now documented at
        https://lwn.net/Articles/748074/. Unlike the original plans, I'm not
        marking any ports as deprecated but remove them all at once after I
        made sure that they are all unused. Some architectures (notably tile,
        mn10300, and blackfin) are still being shipped in products with old
        kernels, but those products will never be updated to newer kernel
        releases.
      
        After this series, we still have a few architectures without mainline
        gcc support:
      
         - unicore32 and hexagon both have very outdated gcc releases, but the
           maintainers promised to work on providing something newer. At least
           in case of hexagon, this will only be llvm, not gcc.
      
         - openrisc, risc-v and nds32 are still in the process of finishing
           their support or getting it added to mainline gcc in the first
           place. They all have patched gcc-7.3 ports that work to some
           degree, but complete upstream support won't happen before gcc-8.1.
           Csky posted their first kernel patch set last week, their situation
           will be similar
      
        [ Palmer Dabbelt points out that RISC-V support is in mainline gcc
          since gcc-7, although gcc-7.3.0 is the recommended minimum  - Linus ]"
      
      This really says it all:
      
       2498 files changed, 95 insertions(+), 467668 deletions(-)
      
      * tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (74 commits)
        MAINTAINERS: UNICORE32: Change email account
        staging: iio: remove iio-trig-bfin-timer driver
        tty: hvc: remove tile driver
        tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers
        serial: remove tile uart driver
        serial: remove m32r_sio driver
        serial: remove blackfin drivers
        serial: remove cris/etrax uart drivers
        usb: Remove Blackfin references in USB support
        usb: isp1362: remove blackfin arch glue
        usb: musb: remove blackfin port
        usb: host: remove tilegx platform glue
        pwm: remove pwm-bfin driver
        i2c: remove bfin-twi driver
        spi: remove blackfin related host drivers
        watchdog: remove bfin_wdt driver
        can: remove bfin_can driver
        mmc: remove bfin_sdh driver
        input: misc: remove blackfin rotary driver
        input: keyboard: remove bf54x driver
        ...
      f5a8eb63
    • Linus Torvalds's avatar
      Merge tag 'nds32-for-linus-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux · c9297d28
      Linus Torvalds authored
      Pull nds32 architecture support from Greentime Hu:
       "This contains the core nds32 Linux port (including interrupt
        controller driver and timer driver), which has been through seven
        rounds of review on mailing list.
      
        It is able to boot to shell and passes most LTP-2017 testsuites in
        nds32 AE3XX platform:
      
          Total Tests: 1901
          Total Skipped Tests: 618
          Total Failures: 78"
      Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
      
      * tag 'nds32-for-linus-4.17' of git://git.kernel.org/pub/scm/linux/kernel/git/greentime/linux: (44 commits)
        nds32: To use the generic dump_stack()
        nds32: fix building failed if using elf toolchain.
        nios2: add ioremap_nocache declaration before include asm-generic/io.h.
        nds32: fix building failed if using older version gcc.
        dt-bindings: timer: Add andestech atcpit100 timer binding doc
        clocksource/drivers/atcpit100: VDSO support
        clocksource/drivers/atcpit100: Add andestech atcpit100 timer
        net: faraday add nds32 support.
        irqchip: Andestech Internal Vector Interrupt Controller driver
        dt-bindings: interrupt-controller: Andestech Internal Vector Interrupt Controller
        dt-bindings: nds32 SoC Bindings
        dt-bindings: nds32 L2 cache controller Bindings
        dt-bindings: nds32 CPU Bindings
        MAINTAINERS: Add nds32
        nds32: Build infrastructure
        nds32: defconfig
        nds32: Miscellaneous header files
        nds32: Device tree support
        nds32: Generic timers support
        nds32: Loadable modules
        ...
      c9297d28
    • Linus Torvalds's avatar
      Merge tag 'm68k-for-v4.17-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k · 17e3cd22
      Linus Torvalds authored
      Pull m68k updates from Geert Uytterhoeven:
      
       - Macintosh enhancements and fixes
      
       - Remove useless memory layout printing using hashed pointers
      
       - Add missing Amiga Zorro bus DMA mask
      
       - Small fixes and cleanups
      
       - Defconfig updates
      
      * tag 'm68k-for-v4.17-tag1' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
        m68k/mac: Remove bogus "FIXME" comment
        m68k/mac: Enable RTC for 100-series PowerBooks
        m68k/mac: Clean up whitespace and remove redundant parentheses
        m68k/defconfig: Update defconfigs for v4.16-rc5
        zorro: Set up z->dev.dma_mask for the DMA API
        m68k/time: Stop validating rtc_time in .read_time
        m68k/mm: Stop printing the virtual memory layout
        macintosh/via-pmu68k: Initialize PMU driver with setup_arch and arch_initcall
        m68k/mac: Fix apparent race condition in Baboon interrupt dispatch
        m68k/mac: Enable PDMA support for PowerBook 190
      17e3cd22
    • Linus Torvalds's avatar
      Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · bc16d405
      Linus Torvalds authored
      Pull EFI updates from Ingo Molnar:
       "The main EFI changes in this cycle were:
      
         - Fix the apple-properties code (Andy Shevchenko)
      
         - Add WARN() on arm64 if UEFI Runtime Services corrupt the reserved
           x18 register (Ard Biesheuvel)
      
         - Use efi_switch_mm() on x86 instead of manipulating %cr3 directly
           (Sai Praneeth)
      
         - Fix early memremap leak in ESRT code (Ard Biesheuvel)
      
         - Switch to L"xxx" notation for wide string literals (Ard Biesheuvel)
      
         - ... plus misc other cleanups and bugfixes"
      
      * 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/efi: Use efi_switch_mm() rather than manually twiddling with %cr3
        x86/efi: Replace efi_pgd with efi_mm.pgd
        efi: Use string literals for efi_char16_t variable initializers
        efi/esrt: Fix handling of early ESRT table mapping
        efi: Use efi_mm in x86 as well as ARM
        efi: Make const array 'apple' static
        efi/apple-properties: Use memremap() instead of ioremap()
        efi: Reorder pr_notice() with add_device_randomness() call
        x86/efi: Replace GFP_ATOMIC with GFP_KERNEL in efi_query_variable_store()
        efi/arm64: Check whether x18 is preserved by runtime services calls
        efi/arm*: Stop printing addresses of virtual mappings
        efi/apple-properties: Remove redundant attribute initialization from unmarshal_key_value_pairs()
        efi/arm*: Only register page tables when they exist
      bc16d405
    • Linus Torvalds's avatar
      Merge branch 'x86-dma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 2fcd2b30
      Linus Torvalds authored
      Pull x86 dma mapping updates from Ingo Molnar:
       "This tree, by Christoph Hellwig, switches over the x86 architecture to
        the generic dma-direct and swiotlb code, and also unifies more of the
        dma-direct code between architectures. The now unused x86-only
        primitives are removed"
      
      * 'x86-dma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        dma-mapping: Don't clear GFP_ZERO in dma_alloc_attrs
        swiotlb: Make swiotlb_{alloc,free}_buffer depend on CONFIG_DMA_DIRECT_OPS
        dma/swiotlb: Remove swiotlb_{alloc,free}_coherent()
        dma/direct: Handle force decryption for DMA coherent buffers in common code
        dma/direct: Handle the memory encryption bit in common code
        dma/swiotlb: Remove swiotlb_set_mem_attributes()
        set_memory.h: Provide set_memory_{en,de}crypted() stubs
        x86/dma: Remove dma_alloc_coherent_gfp_flags()
        iommu/intel-iommu: Enable CONFIG_DMA_DIRECT_OPS=y and clean up intel_{alloc,free}_coherent()
        iommu/amd_iommu: Use CONFIG_DMA_DIRECT_OPS=y and dma_direct_{alloc,free}()
        x86/dma/amd_gart: Use dma_direct_{alloc,free}()
        x86/dma/amd_gart: Look at dev->coherent_dma_mask instead of GFP_DMA
        x86/dma: Use generic swiotlb_ops
        x86/dma: Use DMA-direct (CONFIG_DMA_DIRECT_OPS=y)
        x86/dma: Remove dma_alloc_coherent_mask()
      2fcd2b30
  3. 02 Apr, 2018 29 commits
    • Linus Torvalds's avatar
      Merge branch 'sched-wait-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · ce6eba3d
      Linus Torvalds authored
      Pull wait_var_event updates from Ingo Molnar:
       "This introduces the new wait_var_event() API, which is a more flexible
        waiting primitive than wait_on_atomic_t().
      
        All wait_on_atomic_t() users are migrated over to the new API and
        wait_on_atomic_t() is removed. The migration fixes one bug and should
        result in no functional changes for the other usecases"
      
      * 'sched-wait-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        sched/wait: Improve __var_waitqueue() code generation
        sched/wait: Remove the wait_on_atomic_t() API
        sched/wait, arch/mips: Fix and convert wait_on_atomic_t() usage to the new wait_var_event() API
        sched/wait, fs/ocfs2: Convert wait_on_atomic_t() usage to the new wait_var_event() API
        sched/wait, fs/nfs: Convert wait_on_atomic_t() usage to the new wait_var_event() API
        sched/wait, fs/fscache: Convert wait_on_atomic_t() usage to the new wait_var_event() API
        sched/wait, fs/btrfs: Convert wait_on_atomic_t() usage to the new wait_var_event() API
        sched/wait, fs/afs: Convert wait_on_atomic_t() usage to the new wait_var_event() API
        sched/wait, drivers/media: Convert wait_on_atomic_t() usage to the new wait_var_event() API
        sched/wait, drivers/drm: Convert wait_on_atomic_t() usage to the new wait_var_event() API
        sched/wait: Introduce wait_var_event()
      ce6eba3d
    • Linus Torvalds's avatar
      Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · a5532439
      Linus Torvalds authored
      Pull x86 timer updates from Ingo Molnar:
       "Two changes: add the new convert_art_ns_to_tsc() API for upcoming
        Intel Goldmont+ drivers, and remove the obsolete rdtscll() API"
      
      * 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/tsc: Get rid of rdtscll()
        x86/tsc: Convert ART in nanoseconds to TSC
      a5532439
    • Linus Torvalds's avatar
      Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · cea061e4
      Linus Torvalds authored
      Pull x86 platform updates from Ingo Molnar:
       "The main changes in this cycle were:
      
         - Add "Jailhouse" hypervisor support (Jan Kiszka)
      
         - Update DeviceTree support (Ivan Gorinov)
      
         - Improve DMI date handling (Andy Shevchenko)"
      
      * 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/PCI: Fix a potential regression when using dmi_get_bios_year()
        firmware/dmi_scan: Uninline dmi_get_bios_year() helper
        x86/devicetree: Use CPU description from Device Tree
        of/Documentation: Specify local APIC ID in "reg"
        MAINTAINERS: Add entry for Jailhouse
        x86/jailhouse: Allow to use PCI_MMCONFIG without ACPI
        x86: Consolidate PCI_MMCONFIG configs
        x86: Align x86_64 PCI_MMCONFIG with 32-bit variant
        x86/jailhouse: Enable PCI mmconfig access in inmates
        PCI: Scan all functions when running over Jailhouse
        jailhouse: Provide detection for non-x86 systems
        x86/devicetree: Fix device IRQ settings in DT
        x86/devicetree: Initialize device tree before using it
        pci: Simplify code by using the new dmi_get_bios_year() helper
        ACPI/sleep: Simplify code by using the new dmi_get_bios_year() helper
        x86/pci: Simplify code by using the new dmi_get_bios_year() helper
        dmi: Introduce the dmi_get_bios_year() helper function
        x86/platform/quark: Re-use DEFINE_SHOW_ATTRIBUTE() macro
        x86/platform/atom: Re-use DEFINE_SHOW_ATTRIBUTE() macro
      cea061e4
    • Linus Torvalds's avatar
      Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · d22fff81
      Linus Torvalds authored
      Pull x86 mm updates from Ingo Molnar:
      
       - Extend the memmap= boot parameter syntax to allow the redeclaration
         and dropping of existing ranges, and to support all e820 range types
         (Jan H. Schönherr)
      
       - Improve the W+X boot time security checks to remove false positive
         warnings on Xen (Jan Beulich)
      
       - Support booting as Xen PVH guest (Juergen Gross)
      
       - Improved 5-level paging (LA57) support, in particular it's possible
         now to have a single kernel image for both 4-level and 5-level
         hardware (Kirill A. Shutemov)
      
       - AMD hardware RAM encryption support (SME/SEV) fixes (Tom Lendacky)
      
       - Preparatory commits for hardware-encrypted RAM support on Intel CPUs.
         (Kirill A. Shutemov)
      
       - Improved Intel-MID support (Andy Shevchenko)
      
       - Show EFI page tables in page_tables debug files (Andy Lutomirski)
      
       - ... plus misc fixes and smaller cleanups
      
      * 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (56 commits)
        x86/cpu/tme: Fix spelling: "configuation" -> "configuration"
        x86/boot: Fix SEV boot failure from change to __PHYSICAL_MASK_SHIFT
        x86/mm: Update comment in detect_tme() regarding x86_phys_bits
        x86/mm/32: Remove unused node_memmap_size_bytes() & CONFIG_NEED_NODE_MEMMAP_SIZE logic
        x86/mm: Remove pointless checks in vmalloc_fault
        x86/platform/intel-mid: Add special handling for ACPI HW reduced platforms
        ACPI, x86/boot: Introduce the ->reduced_hw_early_init() ACPI callback
        ACPI, x86/boot: Split out acpi_generic_reduce_hw_init() and export
        x86/pconfig: Provide defines and helper to run MKTME_KEY_PROG leaf
        x86/pconfig: Detect PCONFIG targets
        x86/tme: Detect if TME and MKTME is activated by BIOS
        x86/boot/compressed/64: Handle 5-level paging boot if kernel is above 4G
        x86/boot/compressed/64: Use page table in trampoline memory
        x86/boot/compressed/64: Use stack from trampoline memory
        x86/boot/compressed/64: Make sure we have a 32-bit code segment
        x86/mm: Do not use paravirtualized calls in native_set_p4d()
        kdump, vmcoreinfo: Export pgtable_l5_enabled value
        x86/boot/compressed/64: Prepare new top-level page table for trampoline
        x86/boot/compressed/64: Set up trampoline memory
        x86/boot/compressed/64: Save and restore trampoline memory
        ...
      d22fff81
    • Linus Torvalds's avatar
      Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 986b37c0
      Linus Torvalds authored
      Pull x86 cleanups and msr updates from Ingo Molnar:
       "The main change is a performance/latency improvement to /dev/msr
        access. The rest are misc cleanups"
      
      * 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/msr: Make rdmsrl_safe_on_cpu() scheduling safe as well
        x86/cpuid: Allow cpuid_read() to schedule
        x86/msr: Allow rdmsr_safe_on_cpu() to schedule
        x86/rtc: Stop using deprecated functions
        x86/dumpstack: Unify show_regs()
        x86/fault: Do not print IP in show_fault_oops()
        x86/MSR: Move native_* variants to msr.h
      986b37c0
    • Linus Torvalds's avatar
      Merge branch 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · e68b4bad
      Linus Torvalds authored
      Pull x86 build updates from Ingo Molnar:
       "The biggest change is the forcing of asm-goto support on x86, which
        effectively increases the GCC minimum supported version to gcc-4.5 (on
        x86)"
      
      * 'x86-build-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/build: Don't pass in -D__KERNEL__ multiple times
        x86: Remove FAST_FEATURE_TESTS
        x86: Force asm-goto
        x86/build: Drop superfluous ALIGN from the linker script
      e68b4bad
    • Linus Torvalds's avatar
      Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 5e46caf6
      Linus Torvalds authored
      Pull x86 asm fixlets from Ingo Molnar:
       "A clobber list fix and cleanups"
      
      * 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/asm: Trim clear_page.S includes
        x86/asm: Clobber flags in clear_page()
      5e46caf6
    • Linus Torvalds's avatar
      Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 2451d1e5
      Linus Torvalds authored
      Pull x86 apic updates from Ingo Molnar:
       "The main x86 APIC/IOAPIC changes in this cycle were:
      
         - Robustify kexec support to more carefully restore IRQ hardware
           state before calling into kexec/kdump kernels. (Baoquan He)
      
         - Clean up the local APIC code a bit (Dou Liyang)
      
         - Remove unused callbacks (David Rientjes)"
      
      * 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/apic: Finish removing unused callbacks
        x86/apic: Drop logical_smp_processor_id() inline
        x86/apic: Modernize the pending interrupt code
        x86/apic: Move pending interrupt check code into it's own function
        x86/apic: Set up through-local-APIC mode on the boot CPU if 'noapic' specified
        x86/apic: Rename variables and functions related to x86_io_apic_ops
        x86/apic: Remove the (now) unused disable_IO_APIC() function
        x86/apic: Fix restoring boot IRQ mode in reboot and kexec/kdump
        x86/apic: Split disable_IO_APIC() into two functions to fix CONFIG_KEXEC_JUMP=y
        x86/apic: Split out restore_boot_irq_mode() from disable_IO_APIC()
        x86/apic: Make setup_local_APIC() static
        x86/apic: Simplify init_bsp_APIC() usage
        x86/x2apic: Mark set_x2apic_phys_mode() as __init
      2451d1e5
    • Linus Torvalds's avatar
      Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 67dbfc14
      Linus Torvalds authored
      Pull SMP hotplug updates from Ingo Molnar:
       "Simplify the CPU hot-plug state machine"
      
      * 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        cpu/hotplug: Fix unused function warning
        cpu/hotplug: Merge cpuhp_bp_states and cpuhp_ap_states
      67dbfc14
    • Linus Torvalds's avatar
      Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 46e0d28b
      Linus Torvalds authored
      Pull scheduler updates from Ingo Molnar:
       "The main scheduler changes in this cycle were:
      
         - NUMA balancing improvements (Mel Gorman)
      
         - Further load tracking improvements (Patrick Bellasi)
      
         - Various NOHZ balancing cleanups and optimizations (Peter Zijlstra)
      
         - Improve blocked load handling, in particular we can now reduce and
           eventually stop periodic load updates on 'very idle' CPUs. (Vincent
           Guittot)
      
         - On isolated CPUs offload the final 1Hz scheduler tick as well, plus
           related cleanups and reorganization. (Frederic Weisbecker)
      
         - Core scheduler code cleanups (Ingo Molnar)"
      
      * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (45 commits)
        sched/core: Update preempt_notifier_key to modern API
        sched/cpufreq: Rate limits for SCHED_DEADLINE
        sched/fair: Update util_est only on util_avg updates
        sched/cpufreq/schedutil: Use util_est for OPP selection
        sched/fair: Use util_est in LB and WU paths
        sched/fair: Add util_est on top of PELT
        sched/core: Remove TASK_ALL
        sched/completions: Use bool in try_wait_for_completion()
        sched/fair: Update blocked load when newly idle
        sched/fair: Move idle_balance()
        sched/nohz: Merge CONFIG_NO_HZ_COMMON blocks
        sched/fair: Move rebalance_domains()
        sched/nohz: Optimize nohz_idle_balance()
        sched/fair: Reduce the periodic update duration
        sched/nohz: Stop NOHZ stats when decayed
        sched/cpufreq: Provide migration hint
        sched/nohz: Clean up nohz enter/exit
        sched/fair: Update blocked load from NEWIDLE
        sched/fair: Add NOHZ stats balancing
        sched/fair: Restructure nohz_balance_kick()
        ...
      46e0d28b
    • Linus Torvalds's avatar
      Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 86bbbeba
      Linus Torvalds authored
      Pull x86 RAS updates from Ingo Molnar:
       "The main changes in this cycle were:
      
         - AMD MCE support/decoding improvements (Yazen Ghannam)
      
         - general MCE header cleanups and reorganization (Borislav Petkov)"
      
      * 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        Revert "x86/mce/AMD: Collect error info even if valid bits are not set"
        x86/MCE: Cleanup and complete struct mce fields definitions
        x86/mce/AMD: Carve out SMCA get_block_address() code
        x86/mce/AMD: Get address from already initialized block
        x86/mce/AMD, EDAC/mce_amd: Enumerate Reserved SMCA bank type
        x86/mce/AMD: Pass the bank number to smca_get_bank_type()
        x86/mce/AMD: Collect error info even if valid bits are not set
        x86/mce: Issue the 'mcelog --ascii' message only on !AMD
        x86/mce: Convert 'struct mca_config' bools to a bitfield
        x86/mce: Put private structures and definitions into the internal header
      86bbbeba
    • Howard McLauchlan's avatar
      bpf: whitelist all syscalls for error injection · c9a21195
      Howard McLauchlan authored
      Error injection is a useful mechanism to fail arbitrary kernel
      functions. However, it is often hard to guarantee an error propagates
      appropriately to user space programs. By injecting into syscalls, we can
      return arbitrary values to user space directly; this increases
      flexibility and robustness in testing, allowing us to test user space
      error paths effectively.
      
      The following script, for example, fails calls to sys_open() from a
      given pid:
      
      from bcc import BPF
      from sys import argv
      
      pid = argv[1]
      
      prog = r"""
      
      int kprobe__SyS_open(struct pt_regs *ctx, const char *pathname, int flags)
      {
          u32 pid = bpf_get_current_pid_tgid();
          if (pid == %s)
              bpf_override_return(ctx, -ENOMEM);
          return 0;
      }
      """ % pid
      
      b = BPF(text=prog)
      while 1:
          b.perf_buffer_poll()
      
      This patch whitelists all syscalls defined with SYSCALL_DEFINE and
      COMPAT_SYSCALL_DEFINE for error injection. These changes are not
      intended to be considered stable, and would normally be configured off.
      Signed-off-by: default avatarHoward McLauchlan <hmclauchlan@fb.com>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      c9a21195
    • Dominik Brodowski's avatar
      kernel/sys_ni: remove {sys_,sys_compat} from cond_syscall definitions · 67a7acd3
      Dominik Brodowski authored
      This keeps it in line with the SYSCALL_DEFINEx() / COMPAT_SYSCALL_DEFINEx()
      calling convention.
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      67a7acd3
    • Dominik Brodowski's avatar
      kernel/sys_ni: sort cond_syscall() entries · 70dd4b31
      Dominik Brodowski authored
      Shuffle the cond_syscall() entries in kernel/sys_ni.c around so that they
      are kept in the same order as in include/uapi/asm-generic/unistd.h. For
      better structuring, add the same comments as in that file, but keep a few
      additional comments and extend the commentary where it seems useful.
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      70dd4b31
    • Dominik Brodowski's avatar
      syscalls/x86: auto-create compat_sys_*() prototypes · 3e2052e5
      Dominik Brodowski authored
      compat_sys_*() functions are no longer called from within the kernel on
      x86 except from the system call table. Linking the system call does not
      require compat_sys_*() function prototypes at least on x86. Therefore,
      generate compat_sys_*() prototypes on-the-fly within the
      COMPAT_SYSCALL_DEFINEx() macro, and remove x86-specific prototypes from
      various header files.
      Suggested-by: default avatarAndy Lutomirski <luto@kernel.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: netdev@vger.kernel.org
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: x86@kernel.org
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      3e2052e5
    • Dominik Brodowski's avatar
      syscalls: sort syscall prototypes in include/linux/compat.h · c679a089
      Dominik Brodowski authored
      Shuffle the syscall prototypes in include/linux/compat.h around so
      that they are kept in the same order as in
      include/uapi/asm-generic/unistd.h. The individual entries are kept
      the same, and neither modified to bring them in line with kernel coding
      style nor wrapped in proper ifdefs -- as an exception to this, add the
      prefix "asmlinkage" where it was missing.
      
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      c679a089
    • Dominik Brodowski's avatar
      net: remove compat_sys_*() prototypes from net/compat.h · 0621150d
      Dominik Brodowski authored
      As the syscall functions should only be called from the system call table
      but not from elsewhere in the kernel, it is sufficient that they are
      defined in linux/compat.h.
      
      Cc: David S. Miller <davem@davemloft.net>
      Cc: netdev@vger.kernel.org
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      0621150d
    • Dominik Brodowski's avatar
      syscalls: sort syscall prototypes in include/linux/syscalls.h · 3c1c456f
      Dominik Brodowski authored
      Shuffle the syscall prototypes in include/linux/syscalls.h around so
      that they are kept in the same order as in
      include/uapi/asm-generic/unistd.h. The individual entries are kept
      the same, and neither modified to bring them in line with kernel coding
      style nor wrapped in proper ifdefs.
      
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      3c1c456f
    • Dominik Brodowski's avatar
      kexec: move sys_kexec_load() prototype to syscalls.h · 1bec510a
      Dominik Brodowski authored
      As the syscall function should only be called from the system call table
      but not from elsewhere in the kernel, move the prototype for
      sys_kexec_load() to include/syscall.h.
      
      Cc: Eric Biederman <ebiederm@xmission.com>
      Cc: kexec@lists.infradead.org
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      1bec510a
    • Tautschnig, Michael's avatar
      x86/sigreturn: use SYSCALL_DEFINE0 · 4c8ca51a
      Tautschnig, Michael authored
      All definitions of syscalls in x86 except for those patched here have
      already been using the appropriate SYSCALL_DEFINE*.
      Signed-off-by: default avatarMichael Tautschnig <tautschn@amazon.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Jaswinder Singh <jaswinder@infradead.org>
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: x86@kernel.org
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      4c8ca51a
    • Dominik Brodowski's avatar
      x86: fix sys_sigreturn() return type to be long, not unsigned long · 025bd390
      Dominik Brodowski authored
      Same as with other system calls, sys_sigreturn() should return a value
      of type long, not unsigned long. This also matches the behaviour for
      IA32_EMULATION, see sys32_sigreturn() in arch/x86/ia32/ia32_signal.c .
      
      Cc: Andi Kleen <ak@linux.intel.com>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Jiri Slaby <jslaby@suse.com>
      Cc: x86@kernel.org
      Cc: Michael Tautschnig <tautschn@amazon.co.uk>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      025bd390
    • Dominik Brodowski's avatar
      x86/ioport: add ksys_ioperm() helper; remove in-kernel calls to sys_ioperm() · 66f4e88c
      Dominik Brodowski authored
      Using this helper allows us to avoid the in-kernel calls to the
      sys_ioperm() syscall. The ksys_ prefix denotes that this function is meant
      as a drop-in replacement for the syscall. In particular, it uses the same
      calling convention as sys_ioperm().
      
      This patch is part of a series which removes in-kernel calls to syscalls.
      On this basis, the syscall entry path can be streamlined. For details, see
      http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
      
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Jiri Slaby <jslaby@suse.com>
      Cc: x86@kernel.org
      Acked-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      66f4e88c
    • Dominik Brodowski's avatar
      mm: add ksys_readahead() helper; remove in-kernel calls to sys_readahead() · c7b95d51
      Dominik Brodowski authored
      Using this helper allows us to avoid the in-kernel calls to the
      sys_readahead() syscall. The ksys_ prefix denotes that this function is
      meant as a drop-in replacement for the syscall. In particular, it uses the
      same calling convention as sys_readahead().
      
      This patch is part of a series which removes in-kernel calls to syscalls.
      On this basis, the syscall entry path can be streamlined. For details, see
      http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
      
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: linux-mm@kvack.org
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      c7b95d51
    • Dominik Brodowski's avatar
      mm: add ksys_mmap_pgoff() helper; remove in-kernel calls to sys_mmap_pgoff() · a90f590a
      Dominik Brodowski authored
      Using this helper allows us to avoid the in-kernel calls to the
      sys_mmap_pgoff() syscall. The ksys_ prefix denotes that this function is
      meant as a drop-in replacement for the syscall. In particular, it uses the
      same calling convention as sys_mmap_pgoff().
      
      This patch is part of a series which removes in-kernel calls to syscalls.
      On this basis, the syscall entry path can be streamlined. For details, see
      http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
      
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: linux-mm@kvack.org
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      a90f590a
    • Dominik Brodowski's avatar
      mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64() · 9d5b7c95
      Dominik Brodowski authored
      Using the ksys_fadvise64_64() helper allows us to avoid the in-kernel
      calls to the sys_fadvise64_64() syscall. The ksys_ prefix denotes that
      this function is meant as a drop-in replacement for the syscall. In
      particular, it uses the same calling convention as ksys_fadvise64_64().
      
      Some compat stubs called sys_fadvise64(), which then just passed through
      the arguments to sys_fadvise64_64(). Get rid of this indirection, and call
      ksys_fadvise64_64() directly.
      
      This patch is part of a series which removes in-kernel calls to syscalls.
      On this basis, the syscall entry path can be streamlined. For details, see
      http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
      
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: linux-mm@kvack.org
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      9d5b7c95
    • Dominik Brodowski's avatar
      fs: add ksys_fallocate() wrapper; remove in-kernel calls to sys_fallocate() · edf292c7
      Dominik Brodowski authored
      Using the ksys_fallocate() wrapper allows us to get rid of in-kernel
      calls to the sys_fallocate() syscall. The ksys_ prefix denotes that this
      function is meant as a drop-in replacement for the syscall. In
      particular, it uses the same calling convention as sys_fallocate().
      
      This patch is part of a series which removes in-kernel calls to syscalls.
      On this basis, the syscall entry path can be streamlined. For details, see
      http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
      
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      edf292c7
    • Dominik Brodowski's avatar
      fs: add ksys_p{read,write}64() helpers; remove in-kernel calls to syscalls · 36028d5d
      Dominik Brodowski authored
      Using the ksys_p{read,write}64() wrappers allows us to get rid of
      in-kernel calls to the sys_pread64() and sys_pwrite64() syscalls.
      The ksys_ prefix denotes that this function is meant as a drop-in
      replacement for the syscall. In particular, it uses the same calling
      convention as sys_p{read,write}64().
      
      This patch is part of a series which removes in-kernel calls to syscalls.
      On this basis, the syscall entry path can be streamlined. For details, see
      http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
      
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      36028d5d
    • Dominik Brodowski's avatar
      fs: add ksys_truncate() wrapper; remove in-kernel calls to sys_truncate() · df260e21
      Dominik Brodowski authored
      Using the ksys_truncate() wrapper allows us to get rid of in-kernel
      calls to the sys_truncate() syscall. The ksys_ prefix denotes that this
      function is meant as a drop-in replacement for the syscall. In
      particular, it uses the same calling convention as sys_truncate().
      
      This patch is part of a series which removes in-kernel calls to syscalls.
      On this basis, the syscall entry path can be streamlined. For details, see
      http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
      
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      df260e21
    • Dominik Brodowski's avatar
      fs: add ksys_sync_file_range helper(); remove in-kernel calls to syscall · 806cbae1
      Dominik Brodowski authored
      Using this helper allows us to avoid the in-kernel calls to the
      sys_sync_file_range() syscall. The ksys_ prefix denotes that this function
      is meant as a drop-in replacement for the syscall. In particular, it uses
      the same calling convention as sys_sync_file_range().
      
      This patch is part of a series which removes in-kernel calls to syscalls.
      On this basis, the syscall entry path can be streamlined. For details, see
      http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
      
      Cc: Al Viro <viro@zeniv.linux.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
      806cbae1