From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 376BBC43458 for ; Tue, 7 Jul 2026 19:06:54 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4gvrLF0RBmz3brH; Wed, 08 Jul 2026 05:06:29 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=172.105.4.254 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1783451189; cv=none; b=LtMGZo4i8giUIWlXBmOrqXLmjgwv3WIheYILl1AdOdW8B37U3/NGMcH9B865WZ/exdWFSZjaLKPTkYAl9LjHvKtwCPFW94LIKaM60uGG4fQ4U+ItkU3Acr8W1cr0WE1ki3OhNNFf+pZwCq58h9PR7weg0Wa1y/1RpqLzkRjwijOzsQ7LqRgIbh9atp4iNxN87O43X0qpz0sNpIRB/LSA+PeL5ritE+S+VXbVA7cMDSRJXC1+9fmX5jLB1LcOWVVskTn2UvvXqg3AKo4aVf+UKlx6vsmrg+E+IMR0Hr3Xma3IVHzvmYYb05joSeugPJfUAM4JmKEKQtXsp3WiufOwuA== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1783451189; c=relaxed/relaxed; bh=EqhpiB2ZofNX2Hns8Xgz4OVDOubexQBaPatIimxnT/c=; h=Date:Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=bz1fBjGJmez/N5SMHJkMqorE6INsxm+CmaNqcTDdAd0pZC4znXbqbe3rVQAFJPfStdgI8SLmt4j/OxUXNo4PDU3Ds8IXKNNLovgXwl2GHkM4xQVOuFkXx5ktF//DYi8+jKdnW4COsFWW91trLXI1BqIhhl1gzmrUKFR6MqkvB+qreDid0x8PsnWyyqSd9xRBcQoZpt2lgJQl699CsPJtIl7/GwU7cPF63iNJ4A94FKeSGTRPwB0WBkTdLm1A5FKEQ4trDY6s8P/5OzoJhq77v5i4rpuIFRm8ZCtfQnIByDxJEcbAzHepnya7LXYuuKdsvTTvXru0WdETsczymQoZcQ== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=OAQsikH3; dkim-atps=neutral; spf=pass (client-ip=172.105.4.254; helo=tor.source.kernel.org; envelope-from=tglx@kernel.org; receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=OAQsikH3; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=172.105.4.254; helo=tor.source.kernel.org; envelope-from=tglx@kernel.org; receiver=lists.ozlabs.org) Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4gvrLD2xj6z2yfS for ; Wed, 08 Jul 2026 05:06:28 +1000 (AEST) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 8777661385; Tue, 7 Jul 2026 19:06:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6FC491F000E9; Tue, 7 Jul 2026 19:06:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783451186; bh=EqhpiB2ZofNX2Hns8Xgz4OVDOubexQBaPatIimxnT/c=; h=Date:From:To:Cc:Subject:References; b=OAQsikH32zcXysH6hCjDCdC0GZdQsSYEYwKYLO4211wdV8Gx5U5QTVE1+P//2FXpn uIqA0JY8lGaPQiDHJVOdRGZSp+QbqEjfTrKS3EEXVNmeOvIQBrVQEfC4uIvhb5uzt+ eT9i9M6+UlE8GQ+lRJyRHgkq+kITYoE5ZzhOkYUKb2PU4bWHESCf+nr7SFJdz6XhZt 2iGqe+3vU4x0dhlP0lRwEovJHlRUe0zFn5tWw2ueZ7uZSvdCbVVh6SrVwQHTuvbp8Z nNfr1ROiFTyIDkK/ZvtATvAtmDATTdK6yv/sLVE04ZyzvrA9oLmxeUKMvdWrrAByna 52gUU2XWEgjgQ== Date: Tue, 07 Jul 2026 21:06:23 +0200 Message-ID: <20260707190254.030598804@kernel.org> User-Agent: quilt/0.69 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Sven Schnelle , linux-s390@vger.kernel.org, Michael Ellerman , Shrikanth Hegde , linuxppc-dev@lists.ozlabs.org, Kees Cook , Huacai Chen , loongarch@lists.linux.dev, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, x86@kernel.org, Mark Rutland , Jinjie Ruan , Andy Lutomirski , Oleg Nesterov , Richard Henderson , Russell King , Catalin Marinas , Guo Ren , Geert Uytterhoeven , Thomas Bogendoerfer , Helge Deller , Yoshinori Sato , Richard Weinberger , Chris Zankel , linux-arm-kernel@lists.infradead.org, linux-alpha@vger.kernel.org, linux-csky@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-um@lists.infradead.org, Arnd Bergmann , Vineet Gupta , Will Deacon , Brian Cain , Michal Simek , Dinh Nguyen , "David S. Miller" , Andreas Larsson , linux-snps-arc@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-openrisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, =?UTF-8?q?Michal=20Such=C3=A1nek?= , Jonathan Corbet , linux-doc@vger.kernel.org Subject: [patch 07/18] s390/syscall: Use enter_from_user_mode_randomize_stack() References: <20260707181957.433213175@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 enter_from_user_mode_randomize_stack() replaces enter_from_user_mode() and the subsequent invocation of add_random_kstack_offset_irqsoff(). As a bonus this avoids the overhead of get/put_cpu_var() in add_random_kstack_offset(). No functional change. Signed-off-by: Thomas Gleixner Cc: Sven Schnelle Cc: linux-s390@vger.kernel.org --- arch/s390/kernel/syscall.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/s390/kernel/syscall.c +++ b/arch/s390/kernel/syscall.c @@ -97,8 +97,8 @@ void noinstr __do_syscall(struct pt_regs { unsigned long nr; - enter_from_user_mode(regs); - add_random_kstack_offset(); + enter_from_user_mode_randomize_stack(regs); + regs->psw = get_lowcore()->svc_old_psw; regs->int_code = get_lowcore()->svc_int_code; update_timer_sys();