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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2005-05-05 16:15:17 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-05 16:36:33 -0700
commit0c28130b5c9e8f0b153436d3dae39482e5a70af1 (patch)
treedf2c3f91108cc897cd799196b6044ebb617a8f0a
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 <blaisorblade@yahoo.it> CC: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/i386/kernel/i386_ksyms.c4
-rw-r--r--arch/um/sys-x86_64/ksyms.c3
-rw-r--r--arch/x86_64/kernel/x8664_ksyms.c13
-rw-r--r--lib/string.c4
4 files changed, 4 insertions, 20 deletions
diff --git a/arch/i386/kernel/i386_ksyms.c b/arch/i386/kernel/i386_ksyms.c
index 14ec354bec92..903190a4b3ff 100644
--- a/arch/i386/kernel/i386_ksyms.c
+++ b/arch/i386/kernel/i386_ksyms.c
@@ -169,10 +169,6 @@ EXPORT_SYMBOL(rtc_lock);
EXPORT_SYMBOL_GPL(set_nmi_callback);
EXPORT_SYMBOL_GPL(unset_nmi_callback);
-#undef memcmp
-extern int memcmp(const void *,const void *,__kernel_size_t);
-EXPORT_SYMBOL(memcmp);
-
EXPORT_SYMBOL(register_die_notifier);
#ifdef CONFIG_HAVE_DEC_LOCK
EXPORT_SYMBOL(_atomic_dec_and_lock);
diff --git a/arch/um/sys-x86_64/ksyms.c b/arch/um/sys-x86_64/ksyms.c
index 8d30fa8393c8..a27f0ee6a4f6 100644
--- a/arch/um/sys-x86_64/ksyms.c
+++ b/arch/um/sys-x86_64/ksyms.c
@@ -14,9 +14,6 @@ EXPORT_SYMBOL(__up_wakeup);
/*XXX: we need them because they would be exported by x86_64 */
EXPORT_SYMBOL(__memcpy);
-EXPORT_SYMBOL(strcmp);
-EXPORT_SYMBOL(strcat);
-EXPORT_SYMBOL(strcpy);
/* Networking helper routines. */
/*EXPORT_SYMBOL(csum_partial_copy_from);
diff --git a/arch/x86_64/kernel/x8664_ksyms.c b/arch/x86_64/kernel/x8664_ksyms.c
index 88626e626886..a43dedb58fa2 100644
--- a/arch/x86_64/kernel/x8664_ksyms.c
+++ b/arch/x86_64/kernel/x8664_ksyms.c
@@ -139,35 +139,23 @@ EXPORT_SYMBOL_GPL(unset_nmi_callback);
#undef memmove
#undef memchr
#undef strlen
-#undef strcpy
#undef strncmp
#undef strncpy
#undef strchr
-#undef strcmp
-#undef strcpy
-#undef strcat
-#undef memcmp
extern void * memset(void *,int,__kernel_size_t);
extern size_t strlen(const char *);
extern void * memmove(void * dest,const void *src,size_t count);
-extern char * strcpy(char * dest,const char *src);
-extern int strcmp(const char * cs,const char * ct);
extern void *memchr(const void *s, int c, size_t n);
extern void * memcpy(void *,const void *,__kernel_size_t);
extern void * __memcpy(void *,const void *,__kernel_size_t);
-extern char * strcat(char *, const char *);
-extern int memcmp(const void * cs,const void * ct,size_t count);
EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(strlen);
EXPORT_SYMBOL(memmove);
-EXPORT_SYMBOL(strcpy);
EXPORT_SYMBOL(strncmp);
EXPORT_SYMBOL(strncpy);
EXPORT_SYMBOL(strchr);
-EXPORT_SYMBOL(strcmp);
-EXPORT_SYMBOL(strcat);
EXPORT_SYMBOL(strncat);
EXPORT_SYMBOL(memchr);
EXPORT_SYMBOL(strrchr);
@@ -175,7 +163,6 @@ EXPORT_SYMBOL(strnlen);
EXPORT_SYMBOL(memscan);
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(__memcpy);
-EXPORT_SYMBOL(memcmp);
#ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
/* prototypes are wrong, these are assembly with custom calling functions */
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;

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