The patch titled
Subject: lib/string: remove unnecessary #undefs
has been added to the -mm tree. Its filename is
lib-string-remove-unnecessary-undefs.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/lib-string-remove-unnecessary-undefs.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/lib-string-remove-unnecessary-undefs.patch
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------------------------------------------------------
From: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Subject: lib/string: remove unnecessary #undefs
A few architecture specific string.h functions used to be implemented in
terms of preprocessor defines to the corresponding compiler builtins.
Since this is no longer the case, remove unused #undefs.
Only memcmp is still defined in terms of builtins for a few arches.
Link: https://github.com/ClangBuiltLinux/linux/issues/428
Link: https://lkml.kernel.org/r/20201120041113.89382-1-ndesaulniers@xxxxxxxxxx
Fixes: 5f074f3e192f ("lib/string.c: implement a basic bcmp")
Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Yury Norov <yury.norov@xxxxxxxxx>
Cc: Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx>
Cc: Nathan Chancellor <natechancellor@xxxxxxxxx>
Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/string.c | 4 ----
1 file changed, 4 deletions(-)
--- a/lib/string.c~lib-string-remove-unnecessary-undefs
+++ a/lib/string.c
@@ -85,7 +85,6 @@ EXPORT_SYMBOL(strcasecmp);
* @dest: Where to copy the string to
* @src: Where to copy the string from
*/
-#undef strcpy
char *strcpy(char *dest, const char *src)
{
char *tmp = dest;
@@ -302,7 +301,6 @@ EXPORT_SYMBOL(stpcpy);
* @dest: The string to be appended to
* @src: The string to append to it
*/
-#undef strcat
char *strcat(char *dest, const char *src)
{
char *tmp = dest;
@@ -378,7 +376,6 @@ EXPORT_SYMBOL(strlcat);
* @cs: One string
* @ct: Another string
*/
-#undef strcmp
int strcmp(const char *cs, const char *ct)
{
unsigned char c1, c2;
@@ -958,7 +955,6 @@ EXPORT_SYMBOL(memcmp);
* while this particular implementation is a simple (tail) call to memcmp, do
* not rely on anything but whether the return value is zero or non-zero.
*/
-#undef bcmp
int bcmp(const void *a, const void *b, size_t len)
{
return memcmp(a, b, len);
_
Patches currently in -mm which might be from ndesaulniers@xxxxxxxxxx are
compiler-clang-remove-version-check-for-bpf-tracing.patch
lib-string-remove-unnecessary-undefs.patch
gcov-remove-support-for-gcc-49.patch
