1. 26 Apr, 2007 1 commit
  2. 05 Oct, 2006 1 commit
    • David Howells's avatar
      IRQ: Maintain regs pointer globally rather than passing to IRQ handlers · 7d12e780
      David Howells authored
      
      
      Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
      of passing regs around manually through all ~1800 interrupt handlers in the
      Linux kernel.
      
      The regs pointer is used in few places, but it potentially costs both stack
      space and code to pass it around.  On the FRV arch, removing the regs parameter
      from all the genirq function results in a 20% speed up of the IRQ exit path
      (ie: from leaving timer_interrupt() to leaving do_IRQ()).
      
      Where appropriate, an arch may override the generic storage facility and do
      something different with the variable.  On FRV, for instance, the address is
      maintained in GR28 at all times inside the kernel as part of general exception
      handling.
      
      Having looked over the code, it appears that the parameter may be handed down
      through up to twenty or so layers of functions.  Consider a USB character
      device attached to a USB hub, attached to a USB controller that posts its
      interrupts through a cascaded auxiliary interrupt controller.  A character
      device driver may want to pass regs to the sysrq handler through the input
      layer which adds another few layers of parameter passing.
      
      I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
      main part of the code on FRV and i386, though I can't test most of the drivers.
      I've also done partial conversion for powerpc and MIPS - these at least compile
      with minimal configurations.
      
      This will affect all archs.  Mostly the changes should be relatively easy.
      Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
      
      	struct pt_regs *old_regs = set_irq_regs(regs);
      
      And put the old one back at the end:
      
      	set_irq_regs(old_regs);
      
      Don't pass regs through to generic_handle_irq() or __do_IRQ().
      
      In timer_interrupt(), this sort of change will be necessary:
      
      	-	update_process_times(user_mode(regs));
      	-	profile_tick(CPU_PROFILING, regs);
      	+	update_process_times(user_mode(get_irq_regs()));
      	+	profile_tick(CPU_PROFILING);
      
      I'd like to move update_process_times()'s use of get_irq_regs() into itself,
      except that i386, alone of the archs, uses something other than user_mode().
      
      Some notes on the interrupt handling in the drivers:
      
       (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
           the input_dev struct.
      
       (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
           something different depending on whether it's been supplied with a regs
           pointer or not.
      
       (*) Various IRQ handler function pointers have been moved to type
           irq_handler_t.
      Signed-Off-By: default avatarDavid Howells <dhowells@redhat.com>
      (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
      7d12e780
  3. 25 Sep, 2006 1 commit
  4. 03 Jul, 2006 1 commit
    • Andrew Morton's avatar
      [PATCH] sparc: resource warning fix · 5863aa65
      Andrew Morton authored
      
      
      sound/sparc/amd7930.c: In function 'amd7930_attach_common':
      sound/sparc/amd7930.c:1040: warning: format '%08lx' expects type 'long unsigned int', but argument 5 has type 'resource_size_t'
      
      sound/sparc/cs4231.c:2043: warning: format '%016lx' expects type 'long unsigned int', but argument 5 has type 'resource_size_t'
      
      sound/sparc/dbri.c: In function 'dbri_attach':
      sound/sparc/dbri.c:2650: warning: format '%016lx' expects type 'long unsigned int', but argument 5 has type 'resource_size_t'
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      5863aa65
  5. 02 Jul, 2006 1 commit
  6. 24 Jun, 2006 1 commit
  7. 20 Jun, 2006 1 commit
    • David S. Miller's avatar
      [SPARC]: Kill __irq_itoa(). · c6387a48
      David S. Miller authored
      
      
      This ugly hack was long overdue to die.
      
      It was a way to print out Sparc interrupts in a more freindly format,
      since IRQ numbers were arbitrary opaque 32-bit integers which vectored
      into PIL levels.  These 32-bit integers were not necessarily in the
      0-->NR_IRQS range, but the PILs they vectored to were.
      
      The idea now is that we will increase NR_IRQS a little bit and use a
      virtual<-->real IRQ number mapping scheme similar to PowerPC.
      
      That makes this IRQ printing hack irrelevant, and furthermore only a
      handful of drivers actually used __irq_itoa() making it even less
      useful.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c6387a48
  8. 03 Jan, 2006 3 commits
  9. 12 Sep, 2005 2 commits
    • Takashi Iwai's avatar
      [ALSA] Replace with kzalloc() - others · 561b220a
      Takashi Iwai authored
      
      
      Documentation,SA11xx UDA1341 driver,Generic drivers,MPU401 UART,OPL3
      OPL4,Digigram VX core,I2C cs8427,I2C lib core,I2C tea6330t,L3 drivers
      AK4114 receiver,AK4117 receiver,PDAudioCF driver,PPC PMAC driver
      SPARC AMD7930 driver,SPARC cs4231 driver,Synth,Common EMU synth
      USB generic driver,USB USX2Y
      Replace kcalloc(1,..) with kzalloc().
      Signed-off-by: Takashi Iwai's avatarTakashi Iwai <tiwai@suse.de>
      561b220a
    • Takashi Iwai's avatar
      [ALSA] Add snd_card_set_generic_dev() call · 16dab54b
      Takashi Iwai authored
      
      
      ARM,SA11xx UDA1341 driver,Generic drivers,MPU401 UART,MIPS
      MIPS AU1x00 driver,PPC,PPC PowerMac driver,SPARC,SPARC AMD7930 driver
      SPARC cs4231 driver,SPARC DBRI driver
      - Added snd_card_set_generic_dev() call.
      - Added SND_GENERIC_DRIVER to Kconfig.
      - Clean up the error path in probe if necessary.
      Signed-off-by: Takashi Iwai's avatarTakashi Iwai <tiwai@suse.de>
      16dab54b
  10. 16 Apr, 2005 1 commit
    • Linus Torvalds's avatar
      Linux-2.6.12-rc2 · 1da177e4
      Linus Torvalds authored
      Initial git repository build. I'm not bothering with the full history,
      even though we have it. We can create a separate "historical" git
      archive of that later if we want to, and in the meantime it's about
      3.2GB when imported into git - space that would just make the early
      git days unnecessarily complicated, when we don't have a lot of good
      infrastructure for it.
      
      Let it rip!
      1da177e4