From nobody Mon Feb 9 06:50:59 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9CA79231845; Fri, 2 Jan 2026 07:16:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767338185; cv=none; b=Cy4/w4sYMxe/89hvOxghX14OBNAgcbNU5bTiSzeLbYYCGqQR5sfKt+WILt6g5f5N7bfGHeEb3F+PEvXtHCEJPUAw2evXHRDbCnvp7NvEWRncp/ajBx9zXkV45XJCIU3TbqVoJrArySX80EAihl3xeSGW4nizsXGAFST3hlS76NU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767338185; c=relaxed/simple; bh=6IdQhWHRL8sxQR3hfcJIbaJ1RnY35D0jn+3c047cMJE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To:Cc; b=u+xHo4vfV56cmAMZc/15FzUNjeoviPJZy9HCUHBU1Eqn1YhyrieHRebDG48+/fYjcheIKpKcEKcFF7WfnHv0KyneJrMROFDI45uUQiduX+1r0lF7OE+jg2Hqr6C0sIzEEomgBTzgSLoj1tAyxq/4yk5E7Iu70f/OCqAdiBVO3A8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=4DXSF9WW; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=Bsy8va++; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="4DXSF9WW"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Bsy8va++" From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1767338174; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=rUVfCdYU+P2/tuhq3RExnWJpGzo44bddZzASzjEowLU=; b=4DXSF9WWuZcRtKVleaHmSt2nqwEqk0XeBwPTXfycL7khpkOtVy7PZL+IEkYJ+eNkamw8xo BV5LuE1BdaJ7cvM9EeqVqxaAMrLs+tUdalVb6Ye/l2hXP1fuuSyJI7ORq4cpUDlnZcMtNY SOb1L+UF0GHPdImIIuZdMCLrapGW8vCqsB44fIb9wHGckiZs2SvE4Sny3wFTVTklPLUnFu auEJMlqFFFORED4uZqzhD5kFFUFu5dJtrw61jvqCxARTKupo9+2wQD4gSrYB5OUxi3fcaK 5Q5LaN6YFtjHirouZrUvTKh82vS6FyCbBDyAKBTrzawoNm9N2rfcO1J+LPEysw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1767338174; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=rUVfCdYU+P2/tuhq3RExnWJpGzo44bddZzASzjEowLU=; b=Bsy8va++cov7ou85DSjmBzb+UqL3kuYF9dI8cJdbQmk4SG9e5lad3zeJptjL41PzpTIpAv 80az9HoiU0mXalAg== Date: Fri, 02 Jan 2026 08:15:46 +0100 Subject: [PATCH] ARM: fix memset64() on big-endian Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260102-armeb-memset64-v1-1-9aa15fb8e820@linutronix.de> X-B4-Tracking: v=1; b=H4sIAKFwV2kC/x3MSwqAIBRG4a3EHSeoPai2Eg2sfusOtNCIINx70 vAbnPNSRGBEGoqXAm6OfPgMVRa07MZvELxmk5a6UbqSwgSHWTi4iKuthVRWG3SV7WEpR2eA5ec fjlNKH9hYpU9gAAAA X-Change-ID: 20251230-armeb-memset64-01f2ae83f9ef To: Russell King , Andrew Morton , Matthew Wilcox Cc: Russell King , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Arnd Bergmann , stable@vger.kernel.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Developer-Signature: v=1; a=ed25519-sha256; t=1767338172; l=1275; i=thomas.weissschuh@linutronix.de; s=20240209; h=from:subject:message-id; bh=6IdQhWHRL8sxQR3hfcJIbaJ1RnY35D0jn+3c047cMJE=; b=vEVVWgHwwrx7iXQyo/+hyWo5gF0lLYQfBaL2JT9JVklqDQvWNqK5LsdnA7oyvXXXaS2ldaDjJ PEg1QMTO0LiBo5aDEQ3d1izbZj+4V/Dc/JYRHTdr+oRADmoZ+If3X+0 X-Developer-Key: i=thomas.weissschuh@linutronix.de; a=ed25519; pk=pfvxvpFUDJV2h2nY0FidLUml22uGLSjByFbM6aqQQws= On big-endian systems the 32-bit low and high halves need to be swapped, for the underlying assembly implemenation to work correctly. Fixes: fd1d362600e2 ("ARM: implement memset32 & memset64") Cc: stable@vger.kernel.org Signed-off-by: Thomas Wei=C3=9Fschuh Reviewed-by: Arnd Bergmann Reviewed-by: Matthew Wilcox (Oracle) --- Found by the string_test_memset64 KUnit test. --- arch/arm/include/asm/string.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/arm/include/asm/string.h b/arch/arm/include/asm/string.h index 6c607c68f3ad..c35250c4991b 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); } =20 /* --- base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8 change-id: 20251230-armeb-memset64-01f2ae83f9ef Best regards, --=20 Thomas Wei=C3=9Fschuh