path: root/lib
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authorPaolo 'Blaisorblade' Giarrusso <>2005-05-05 16:15:17 -0700
committerLinus Torvalds <>2005-05-05 16:36:33 -0700
commit0c28130b5c9e8f0b153436d3dae39482e5a70af1 (patch)
treedf2c3f91108cc897cd799196b6044ebb617a8f0a /lib
parent23352fc252495fdc072b3bd29f57c4c6b7a6bd83 (diff)
[PATCH] x86_64: make string func definition work as intended
In include/asm-x86_64/string.h there are such comments: /* Use C out of line version for memcmp */ #define memcmp __builtin_memcmp int memcmp(const void * cs,const void * ct,size_t count); This would mean that if the compiler does not decide to use __builtin_memcmp, it emits a call to memcmp to be satisfied by the C out-of-line version in lib/string.c. What happens is that after preprocessing, in lib/string.i you may find the definition of "__builtin_strcmp". Actually, by accident, in the object you will find the definition of strcmp and such (maybe a trick intended to redirect calls to __builtin_memcmp to the default memcmp when the definition is not expanded); however, this particular case is not a documented feature as far as I can see. Also, the EXPORT_SYMBOL does not work, so it's duplicated in the arch. I simply added some #undef to lib/string.c and removed the (now duplicated) exports in x86-64 and UML/x86_64 subarchs (the second ones are introduced by another patch I just posted for -mm). Signed-off-by: Paolo 'Blaisorblade' Giarrusso <> CC: Andi Kleen <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'lib')
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c
index 4bb93ad23c60..5c8b55af0df6 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -65,6 +65,7 @@ EXPORT_SYMBOL(strnicmp);
* @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;
@@ -132,6 +133,7 @@ EXPORT_SYMBOL(strlcpy);
* @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;
@@ -209,6 +211,7 @@ EXPORT_SYMBOL(strlcat);
* @cs: One string
* @ct: Another string
+#undef strcmp
int strcmp(const char * cs,const char * ct)
register signed char __res;
@@ -514,6 +517,7 @@ EXPORT_SYMBOL(memmove);
* @ct: Another area of memory
* @count: The size of the area.
+#undef memcmp
int memcmp(const void * cs,const void * ct,size_t count)
const unsigned char *su1, *su2;