Commit 58c4ce8cd6cd for kernel
commit 58c4ce8cd6cd1fbf1bca2e1d1f42f9e2899fa934
Author: Kees Cook <kees@kernel.org>
Date: Mon Mar 23 01:18:34 2026 +0000
xtensa: Remove arch-specific strncpy() implementation
strncpy() has no remaining callers in the kernel[1]. Remove the
xtensa-specific inline assembly implementation and __HAVE_ARCH_STRNCPY
define, falling back to the generic version in lib/string.c.
Link: https://github.com/KSPP/linux/issues/90 [1]
Signed-off-by: Kees Cook <kees@kernel.org>
diff --git a/arch/xtensa/include/asm/string.h b/arch/xtensa/include/asm/string.h
index ffce43513fa2..e16cda026df7 100644
--- a/arch/xtensa/include/asm/string.h
+++ b/arch/xtensa/include/asm/string.h
@@ -34,31 +34,6 @@ static inline char *strcpy(char *__dest, const char *__src)
return __xdest;
}
-#define __HAVE_ARCH_STRNCPY
-static inline char *strncpy(char *__dest, const char *__src, size_t __n)
-{
- register char *__xdest = __dest;
- unsigned long __dummy;
-
- if (__n == 0)
- return __xdest;
-
- __asm__ __volatile__(
- "1:\n\t"
- "l8ui %2, %1, 0\n\t"
- "s8i %2, %0, 0\n\t"
- "addi %1, %1, 1\n\t"
- "addi %0, %0, 1\n\t"
- "beqz %2, 2f\n\t"
- "bne %1, %5, 1b\n"
- "2:"
- : "=r" (__dest), "=r" (__src), "=&r" (__dummy)
- : "0" (__dest), "1" (__src), "r" ((uintptr_t)__src+__n)
- : "memory");
-
- return __xdest;
-}
-
#define __HAVE_ARCH_STRCMP
static inline int strcmp(const char *__cs, const char *__ct)
{