[PATCH 6.12 014/113] ARM: 9468/1: fix memset64() on big-endian

Greg Kroah-Hartman
2026-02-09T14:35:36Z

From: Thomas Weissschuh <thomas.weissschuh@linutronix.de>

commit 23ea2a4c72323feb6e3e025e8a6f18336513d5ad upstream.

On big-endian systems the 32-bit low and high halves need to be swapped
for the underlying assembly implementation to work correctly.

Fixes: fd1d362600e2 ("ARM: implement memset32 & memset64")
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm/include/asm/string.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/arch/arm/include/asm/string.h
+++ b/arch/arm/include/asm/string.h
@@ -42,7 +42,10 @@ static inline void *memset32(uint32_t *p
extern void *__memset64(uint64_t *, uint32_t low, __kernel_size_t, uint32_t hi);
static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
{
- return __memset64(p, v, n * 8, v >> 32);
+ if (IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN))
+ return __memset64(p, v, n * 8, v >> 32);
+ else
+ return __memset64(p, v >> 32, n * 8, v);
}

/*