From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 E59A717084F; Sun, 26 Jan 2025 14:48:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737902929; cv=none; b=E+99pYm2UOgOjPmv2z4Zu4iL7N8GXRqZTxII1wUTYpVSuVl0OYqXjoGvISdoVzac7jXuO2l3mIayhKY1M76N3BunQsj+PjxcukVMBjGHl/61G5AEzh8qrsSQWwficEPft+d1pVrXdMXntKgvp5jsqKHcNMnfJhyv1c07ApLpBsI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737902929; c=relaxed/simple; bh=eh4cIulasgqyPYNqTd0PIqpVWaBDnASMx9Xs+U8eW9k=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=TkorYxfMyeCi5rO89N+IDGhjFvJVlqGfV8UmgaxBc76HZRo9vwpkV0c86xzham/mtc6WLLQG2kZdUwVpzbrVTo+lqDzxMV20BeAnnYajja9gikFOARy0i0Z7Xas164cyt1Pd2mYwDcwGrClm9vQgTkFy3WQvkCzHMkkw01SYLKQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gVZi/5yO; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gVZi/5yO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4C2CFC4CED3; Sun, 26 Jan 2025 14:48:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737902928; bh=eh4cIulasgqyPYNqTd0PIqpVWaBDnASMx9Xs+U8eW9k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gVZi/5yOPWFByekCISiwlAzV8c+58Cc/0yQLJ3P9oUce56n0fJjrkOkZbDNdF43Ph gDjrDCagpp7SkzA72s8xJ2HvDchI0xW6dZ+exNd6WqllGRwSSUyKkT9h1Qd1cqe9Gl pCCck8taFdCwKlEp2n0EEMcwRhuKR2W6N3pHdmJLiGpBBkIL3RLZkvXVm2u0s1kLRB RzDvG+rrkVlAIj5sQ0AjUnE9Omnka6NY3EyJnbMy/BoGA5c3GzTg1LEbcsA49Kmd4f jpuNuXjb/g7LSdebLoiqDBO9YZDGmQp0qymIIkJJfnor1DH6hIoiDZ3lpLupDerAM/ sTVd/e7DW0ZCg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sven Schnelle , Heiko Carstens , Alexander Gordeev , Sasha Levin , gor@linux.ibm.com, imbrenda@linux.ibm.com, meted@linux.ibm.com, linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 6.13 4/7] s390/stackleak: Use exrl instead of ex in __stackleak_poison() Date: Sun, 26 Jan 2025 09:48:35 -0500 Message-Id: <20250126144839.925271-4-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250126144839.925271-1-sashal@kernel.org> References: <20250126144839.925271-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.13 Content-Transfer-Encoding: 8bit From: Sven Schnelle [ Upstream commit a88c26bb8e04ee5f2678225c0130a5fbc08eef85 ] exrl is present in all machines currently supported, therefore prefer it over ex. This saves one instruction and doesn't need an additional register to hold the address of the target instruction. Signed-off-by: Sven Schnelle Reviewed-by: Heiko Carstens Signed-off-by: Alexander Gordeev Signed-off-by: Sasha Levin --- arch/s390/include/asm/processor.h | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/s390/include/asm/processor.h b/arch/s390/include/asm/processor.h index 8761fd01a9f09..4f8d5592c2981 100644 --- a/arch/s390/include/asm/processor.h +++ b/arch/s390/include/asm/processor.h @@ -163,8 +163,7 @@ static __always_inline void __stackleak_poison(unsigned long erase_low, " la %[addr],256(%[addr])\n" " brctg %[tmp],0b\n" "1: stg %[poison],0(%[addr])\n" - " larl %[tmp],3f\n" - " ex %[count],0(%[tmp])\n" + " exrl %[count],3f\n" " j 4f\n" "2: stg %[poison],0(%[addr])\n" " j 4f\n" -- 2.39.5