From: Thomas Weissschuh <thomas.weissschuh@linutronix.de>
Date: Wed, 7 Jan 2026 10:01:49 +0000 (+0100)
Subject: ARM: 9468/1: fix memset64() on big-endian
X-Git-Tag: v6.19~17^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=23ea2a4c72323feb6e3e025e8a6f18336513d5ad;p=thirdparty%2Flinux.git

ARM: 9468/1: fix memset64() on big-endian

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>
---

diff --git a/arch/arm/include/asm/string.h b/arch/arm/include/asm/string.h
index 6c607c68f3ad7..c35250c4991bc 100644
--- 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, uint32_t v, __kernel_size_t n)
 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);
 }
 
 /*