From 6e41c585e38ff696de3a11509a0ad0a11150b0c3 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Wed, 22 Jul 2020 22:14:36 -0400
Subject: [PATCH] unify generic instances of csum_partial_copy_nocheck()
quite a few architectures have the same csum_partial_copy_nocheck() -
simply memcpy() the data and then return the csum of the copy.
hexagon, parisc, ia64, s390, um: explicitly spelled out that way.
arc, arm64, csky, h8300, m68k/nommu, microblaze, mips/GENERIC_CSUM, nds32,
nios2, openrisc, riscv, unicore32: end up picking the same thing spelled
out in lib/checksum.h (with varying amounts of perversions along the way).
everybody else (alpha, arm, c6x, m68k/mmu, mips/!GENERIC_CSUM, powerpc,
sh, sparc, x86, xtensa) have non-generic variants. For all except c6x
the declaration is in their asm/checksum.h. c6x uses the wrapper
from asm-generic/checksum.h that would normally lead to the lib/checksum.h
instance, but in case of c6x we end up using an asm function from arch/c6x
instead.
Screw that mess - have architectures with private instances define
_HAVE_ARCH_CSUM_AND_COPY in their asm/checksum.h and have the default
one right in net/checksum.h conditional on _HAVE_ARCH_CSUM_AND_COPY
*not* defined.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
arch/alpha/include/asm/checksum.h | 1 +
arch/arm/include/asm/checksum.h | 1 +
arch/c6x/include/asm/checksum.h | 3 +++
arch/hexagon/include/asm/checksum.h | 11 -----------
arch/hexagon/lib/checksum.c | 11 -----------
arch/ia64/include/asm/checksum.h | 3 ---
arch/ia64/lib/csum_partial_copy.c | 15 ---------------
arch/m68k/include/asm/checksum.h | 1 +
arch/mips/include/asm/checksum.h | 2 +-
arch/nios2/include/asm/checksum.h | 4 ----
arch/parisc/include/asm/checksum.h | 8 --------
arch/parisc/lib/checksum.c | 17 -----------------
arch/powerpc/include/asm/checksum.h | 1 +
arch/s390/include/asm/checksum.h | 7 -------
arch/sh/include/asm/checksum_32.h | 1 +
arch/sparc/include/asm/checksum.h | 1 +
arch/x86/include/asm/checksum.h | 1 +
arch/x86/um/asm/checksum.h | 16 ----------------
arch/xtensa/include/asm/checksum.h | 1 +
include/asm-generic/checksum.h | 12 ------------
include/net/checksum.h | 9 +++++++++
lib/checksum.c | 11 -----------
22 files changed, 21 insertions(+), 116 deletions(-)
diff --git a/arch/alpha/include/asm/checksum.h b/arch/alpha/include/asm/checksum.h
index 0eac81624d01c..7e8e4fa4362dc 100644
--- a/arch/alpha/include/asm/checksum.h
+++ b/arch/alpha/include/asm/checksum.h
@@ -42,6 +42,7 @@ extern __wsum csum_partial(const void *buff, int len, __wsum sum);
* better 64-bit) boundary
*/
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
+#define _HAVE_ARCH_CSUM_AND_COPY
__wsum csum_and_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp);
__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
diff --git a/arch/arm/include/asm/checksum.h b/arch/arm/include/asm/checksum.h
index ed6073fee338a..53f7695085402 100644
--- a/arch/arm/include/asm/checksum.h
+++ b/arch/arm/include/asm/checksum.h
@@ -41,6 +41,7 @@ __wsum
csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *err_ptr);
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
+#define _HAVE_ARCH_CSUM_AND_COPY
static inline
__wsum csum_and_copy_from_user (const void __user *src, void *dst,
int len, __wsum sum, int *err_ptr)
diff --git a/arch/c6x/include/asm/checksum.h b/arch/c6x/include/asm/checksum.h
index 36770b8308d9d..fa31bdc186b23 100644
--- a/arch/c6x/include/asm/checksum.h
+++ b/arch/c6x/include/asm/checksum.h
@@ -26,6 +26,9 @@ csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
}
#define csum_tcpudp_nofold csum_tcpudp_nofold
+#define _HAVE_ARCH_CSUM_AND_COPY
+extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
+
#include <asm-generic/checksum.h>
#endif /* _ASM_C6X_CHECKSUM_H */
diff --git a/arch/hexagon/include/asm/checksum.h b/arch/hexagon/include/asm/checksum.h
index a5c42f4614c16..4bc6ad96c4c5f 100644
--- a/arch/hexagon/include/asm/checksum.h
+++ b/arch/hexagon/include/asm/checksum.h
@@ -9,17 +9,6 @@
#define do_csum do_csum
unsigned int do_csum(const void *voidptr, int len);
-/*
- * the same as csum_partial, but copies from src while it
- * checksums
- *
- * here even more important to align src and dst on a 32-bit (or even
- * better 64-bit) boundary
- */
-#define csum_partial_copy_nocheck csum_partial_copy_nocheck
-__wsum csum_partial_copy_nocheck(const void *src, void *dst,
- int len, __wsum sum);
-
/*
* computes the checksum of the TCP/UDP pseudo-header
* returns a 16-bit checksum, already complemented
diff --git a/arch/hexagon/lib/checksum.c b/arch/hexagon/lib/checksum.c
index c4a6b72d97def..ba50822a0800b 100644
--- a/arch/hexagon/lib/checksum.c
+++ b/arch/hexagon/lib/checksum.c
@@ -176,14 +176,3 @@ unsigned int do_csum(const void *voidptr, int len)
return 0xFFFF & sum0;
}
-
-/*
- * copy from ds while checksumming, otherwise like csum_partial
- */
-__wsum
-csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
-{
- memcpy(dst, src, len);
- return csum_partial(dst, len, sum);
-}
-EXPORT_SYMBOL(csum_partial_copy_nocheck);
diff --git a/arch/ia64/include/asm/checksum.h b/arch/ia64/include/asm/checksum.h
index 2a1c64629cdcd..f3026213aa32b 100644
--- a/arch/ia64/include/asm/checksum.h
+++ b/arch/ia64/include/asm/checksum.h
@@ -37,9 +37,6 @@ extern __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
*/
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
-extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
- int len, __wsum sum);
-
/*
* This routine is used for miscellaneous IP-like checksums, mainly in
* icmp.c
diff --git a/arch/ia64/lib/csum_partial_copy.c b/arch/ia64/lib/csum_partial_copy.c
index 6e82e0be80409..917e3138b277c 100644
--- a/arch/ia64/lib/csum_partial_copy.c
+++ b/arch/ia64/lib/csum_partial_copy.c
@@ -96,18 +96,3 @@ unsigned long do_csum_c(const unsigned char * buff, int len, unsigned int psum)
out:
return result;
}
-
-/*
- * XXX Fixme
- *
- * This is very ugly but temporary. THIS NEEDS SERIOUS ENHANCEMENTS.
- * But it's very tricky to get right even in C.
- */
-__wsum
-csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
-{
- memcpy(dst, src, len);
- return csum_partial(dst, len, sum);
-}
-
-EXPORT_SYMBOL(csum_partial_copy_nocheck);
diff --git a/arch/m68k/include/asm/checksum.h b/arch/m68k/include/asm/checksum.h
index 3f2c15d6f18c0..ab16881d84cbd 100644
--- a/arch/m68k/include/asm/checksum.h
+++ b/arch/m68k/include/asm/checksum.h
@@ -31,6 +31,7 @@ __wsum csum_partial(const void *buff, int len, __wsum sum);
*/
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
+#define _HAVE_ARCH_CSUM_AND_COPY
extern __wsum csum_and_copy_from_user(const void __user *src,
void *dst,
int len, __wsum sum,
diff --git a/arch/mips/include/asm/checksum.h b/arch/mips/include/asm/checksum.h
index 181f7d14efb98..abdf1086873df 100644
--- a/arch/mips/include/asm/checksum.h
+++ b/arch/mips/include/asm/checksum.h
@@ -101,9 +101,9 @@ __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
* the same as csum_partial, but copies from user space (but on MIPS
* we have just one address space, so this is identical to the above)
*/
+#define _HAVE_ARCH_CSUM_AND_COPY
__wsum csum_partial_copy_nocheck(const void *src, void *dst,
int len, __wsum sum);
-#define csum_partial_copy_nocheck csum_partial_copy_nocheck
/*
* Fold a partial checksum without adding pseudo headers
diff --git a/arch/nios2/include/asm/checksum.h b/arch/nios2/include/asm/checksum.h
index b4316c361729f..69004e07a1ba3 100644
--- a/arch/nios2/include/asm/checksum.h
+++ b/arch/nios2/include/asm/checksum.h
@@ -12,10 +12,6 @@
/* Take these from lib/checksum.c */
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
-__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
- __wsum sum);
-#define csum_partial_copy_nocheck csum_partial_copy_nocheck
-
extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
extern __sum16 ip_compute_csum(const void *buff, int len);
diff --git a/arch/parisc/include/asm/checksum.h b/arch/parisc/include/asm/checksum.h
index fe8c63b2d2c3c..522cd574c0687 100644
--- a/arch/parisc/include/asm/checksum.h
+++ b/arch/parisc/include/asm/checksum.h
@@ -18,14 +18,6 @@
*/
extern __wsum csum_partial(const void *, int, __wsum);
-/*
- * The same as csum_partial, but copies from src while it checksums.
- *
- * Here even more important to align src and dst on a 32-bit (or even
- * better 64-bit) boundary
- */
-extern __wsum csum_partial_copy_nocheck(const void *, void *, int, __wsum);
-
/*
* Optimized for IP headers, which always checksum on 4 octet boundaries.
*
diff --git a/arch/parisc/lib/checksum.c b/arch/parisc/lib/checksum.c
index c6f161583549f..4818f3db84a5c 100644
--- a/arch/parisc/lib/checksum.c
+++ b/arch/parisc/lib/checksum.c
@@ -106,20 +106,3 @@ __wsum csum_partial(const void *buff, int len, __wsum sum)
}
EXPORT_SYMBOL(csum_partial);
-
-/*
- * copy while checksumming, otherwise like csum_partial
- */
-__wsum csum_partial_copy_nocheck(const void *src, void *dst,
- int len, __wsum sum)
-{
- /*
- * It's 2:30 am and I don't feel like doing it real ...
- * This is lots slower than the real thing (tm)
- */
- sum = csum_partial(src, len, sum);
- memcpy(dst, src, len);
-
- return sum;
-}
-EXPORT_SYMBOL(csum_partial_copy_nocheck);
diff --git a/arch/powerpc/include/asm/checksum.h b/arch/powerpc/include/asm/checksum.h
index 9cce06194dccd..d75fc5bf8f373 100644
--- a/arch/powerpc/include/asm/checksum.h
+++ b/arch/powerpc/include/asm/checksum.h
@@ -29,6 +29,7 @@ extern __wsum csum_and_copy_from_user(const void __user *src, void *dst,
extern __wsum csum_and_copy_to_user(const void *src, void __user *dst,
int len, __wsum sum, int *err_ptr);
+#define _HAVE_ARCH_CSUM_AND_COPY
#define csum_partial_copy_nocheck(src, dst, len, sum) \
csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL)
diff --git a/arch/s390/include/asm/checksum.h b/arch/s390/include/asm/checksum.h
index 6d01c96aeb5c4..6813bfa1eeb78 100644
--- a/arch/s390/include/asm/checksum.h
+++ b/arch/s390/include/asm/checksum.h
@@ -39,13 +39,6 @@ csum_partial(const void *buff, int len, __wsum sum)
return sum;
}
-static inline __wsum
-csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum)
-{
- memcpy(dst,src,len);
- return csum_partial(dst, len, sum);
-}
-
/*
* Fold a partial checksum without adding pseudo headers
*/
diff --git a/arch/sh/include/asm/checksum_32.h b/arch/sh/include/asm/checksum_32.h
index 91571a42e44ed..87269642d78d1 100644
--- a/arch/sh/include/asm/checksum_32.h
+++ b/arch/sh/include/asm/checksum_32.h
@@ -34,6 +34,7 @@ asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
int len, __wsum sum,
int *src_err_ptr, int *dst_err_ptr);
+#define _HAVE_ARCH_CSUM_AND_COPY
/*
* Note: when you get a NULL pointer exception here this means someone
* passed in an incorrect kernel address to one of these functions.
diff --git a/arch/sparc/include/asm/checksum.h b/arch/sparc/include/asm/checksum.h
index a6256cb6fc5cc..deb4fe5aeafd3 100644
--- a/arch/sparc/include/asm/checksum.h
+++ b/arch/sparc/include/asm/checksum.h
@@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef ___ASM_SPARC_CHECKSUM_H
#define ___ASM_SPARC_CHECKSUM_H
+#define _HAVE_ARCH_CSUM_AND_COPY
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
#if defined(__sparc__) && defined(__arch64__)
#include <asm/checksum_64.h>
diff --git a/arch/x86/include/asm/checksum.h b/arch/x86/include/asm/checksum.h
index 0ada98d5d09f7..bca625a60186c 100644
--- a/arch/x86/include/asm/checksum.h
+++ b/arch/x86/include/asm/checksum.h
@@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1
#define HAVE_CSUM_COPY_USER
+#define _HAVE_ARCH_CSUM_AND_COPY
#ifdef CONFIG_X86_32
# include <asm/checksum_32.h>
#else
diff --git a/arch/x86/um/asm/checksum.h b/arch/x86/um/asm/checksum.h
index ff6bba2c8ab61..b07824500363f 100644
--- a/arch/x86/um/asm/checksum.h
+++ b/arch/x86/um/asm/checksum.h
@@ -20,22 +20,6 @@
*/
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
-/*
- * Note: when you get a NULL pointer exception here this means someone
- * passed in an incorrect kernel address to one of these functions.
- *
- * If you use these functions directly please don't forget the
- * access_ok().
- */
-
-static __inline__
-__wsum csum_partial_copy_nocheck(const void *src, void *dst,
- int len, __wsum sum)
-{
- memcpy(dst, src, len);
- return csum_partial(dst, len, sum);
-}
-
/**
* csum_fold - Fold and invert a 32bit checksum.
* sum: 32bit unfolded sum
diff --git a/arch/xtensa/include/asm/checksum.h b/arch/xtensa/include/asm/checksum.h
index 243a5fe79d3cd..0c879099977f1 100644
--- a/arch/xtensa/include/asm/checksum.h
+++ b/arch/xtensa/include/asm/checksum.h
@@ -41,6 +41,7 @@ asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst,
int len, __wsum sum,
int *src_err_ptr, int *dst_err_ptr);
+#define _HAVE_ARCH_CSUM_AND_COPY
/*
* Note: when you get a NULL pointer exception here this means someone
* passed in an incorrect kernel address to one of these functions.
diff --git a/include/asm-generic/checksum.h b/include/asm-generic/checksum.h
index cd8b75aa770d0..43e18db89c143 100644
--- a/include/asm-generic/checksum.h
+++ b/include/asm-generic/checksum.h
@@ -16,18 +16,6 @@
*/
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
-/*
- * the same as csum_partial, but copies from src while it
- * checksums
- *
- * here even more important to align src and dst on a 32-bit (or even
- * better 64-bit) boundary
- */
-#ifndef csum_partial_copy_nocheck
-__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
- __wsum sum);
-#endif
-
#ifndef ip_fast_csum
/*
* This is a version of ip_compute_csum() optimized for IP headers,
diff --git a/include/net/checksum.h b/include/net/checksum.h
index 46754ba9d7b70..db9d02b5f88ac 100644
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -47,6 +47,15 @@ static __inline__ __wsum csum_and_copy_to_user
}
#endif
+#ifndef _HAVE_ARCH_CSUM_AND_COPY
+static inline __wsum
+csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
+{
+ memcpy(dst, src, len);
+ return csum_partial(dst, len, sum);
+}
+#endif
+
#ifndef HAVE_ARCH_CSUM_ADD
static inline __wsum csum_add(__wsum csum, __wsum addend)
{
diff --git a/lib/checksum.c b/lib/checksum.c
index c7861e84c5261..6860d6b05a171 100644
--- a/lib/checksum.c
+++ b/lib/checksum.c
@@ -145,17 +145,6 @@ __sum16 ip_compute_csum(const void *buff, int len)
}
EXPORT_SYMBOL(ip_compute_csum);
-/*
- * copy from ds while checksumming, otherwise like csum_partial
- */
-__wsum
-csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum)
-{
- memcpy(dst, src, len);
- return csum_partial(dst, len, sum);
-}
-EXPORT_SYMBOL(csum_partial_copy_nocheck);
-
#ifndef csum_tcpudp_nofold
static inline u32 from64to32(u64 x)
{
--
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