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s390/string: Remove strcpy() implementation

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Remove the optimized strcpy() library implementation. This doesn't make any
difference since gcc recognizes all strcpy() usages anyway and uses the
builtin variant. There is not a single branch to strcpy() within the
generated kernel image, which also seems to be the reason why most other
architectures don't have a strcpy() implementation anymore.

Reviewed-by: Mikhail Zaslonko <zaslonko@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens
2025-04-30 11:41:28 +02:00
parent ed5eef1141
commit de6b4f9901
2 changed files with 0 additions and 42 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/s390/include/asm/string.h
-18
View File
@@ -26,7 +26,6 @@ void *memmove(void *dest, const void *src, size_t n);
#define __HAVE_ARCH_MEMSCAN /* inline & arch function */
#define __HAVE_ARCH_STRCAT /* inline & arch function */
#define __HAVE_ARCH_STRCMP /* arch function */
#define __HAVE_ARCH_STRCPY /* inline & arch function */
#define __HAVE_ARCH_STRLCAT /* arch function */
#define __HAVE_ARCH_STRLEN /* inline & arch function */
#define __HAVE_ARCH_STRNCAT /* arch function */
@@ -153,22 +152,6 @@ static inline char *strcat(char *dst, const char *src)
}
#endif
#ifdef __HAVE_ARCH_STRCPY
static inline char *strcpy(char *dst, const char *src)
{
char *ret = dst;
asm volatile(
" lghi 0,0\n"
"0: mvst %[dst],%[src]\n"
" jo 0b"
: [dst] "+&a" (dst), [src] "+&a" (src)
:
: "cc", "memory", "0");
return ret;
}
#endif
#if defined(__HAVE_ARCH_STRLEN) || (defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__))
static inline size_t __no_sanitize_prefix_strfunc(strlen)(const char *s)
{
@@ -206,7 +189,6 @@ static inline size_t strnlen(const char * s, size_t n)
void *memchr(const void * s, int c, size_t n);
void *memscan(void *s, int c, size_t n);
char *strcat(char *dst, const char *src);
char *strcpy(char *dst, const char *src);
size_t strlen(const char *s);
size_t strnlen(const char * s, size_t n);
#endif /* !IN_ARCH_STRING_C */
arch/s390/lib/string.c
-24
View File
@@ -77,30 +77,6 @@ size_t strnlen(const char *s, size_t n)
EXPORT_SYMBOL(strnlen);
#endif
/**
* strcpy - Copy a %NUL terminated string
* @dest: Where to copy the string to
* @src: Where to copy the string from
*
* returns a pointer to @dest
*/
#ifdef __HAVE_ARCH_STRCPY
char *strcpy(char *dest, const char *src)
{
char *ret = dest;
asm volatile(
" lghi 0,0\n"
"0: mvst %[dest],%[src]\n"
" jo 0b\n"
: [dest] "+&a" (dest), [src] "+&a" (src)
:
: "cc", "memory", "0");
return ret;
}
EXPORT_SYMBOL(strcpy);
#endif
/**
* strcat - Append one %NUL-terminated string to another
* @dest: The string to be appended to