From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 C606144D03E; Tue, 7 Jul 2026 19:06:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783451204; cv=none; b=qfgfk2fpSKKSRYB83bGjqbEUtxvMd166s9aF0xRDs/4Q+dmNQ7NdwjTdx3L4IeMq/WuY6ixcSMNuwtVRYq4phxh0Vjm27fFTZVkf3GwghG+yMiZMnwnAEEyx3KGXtMa8FJAJckD4fbAluiAQ+6Mw9I74Q3Po4oC1Um2a1o6iGsQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783451204; c=relaxed/simple; bh=CbRs/wo8Df+GsVt72rPyMFgSfNKcvE6Ap7XL1kO3dI4=; h=Date:Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=G01qH6/MSG+ARm+YHu9qdwgJp9lEZFAsbmsrOWYMCQ1zVx4yOJyycYFzMTbTUxulswJfWBE4sCNFu+10XMxr1MYW7+8q+vCh3u3mhgQH3Csc49nrcjwvQuZGp5RI5N5LjXxUuIC/LSXu/5BkQygTu4h08Vi4f44gCDPYbVqIwmg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=h91mvxoS; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="h91mvxoS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E87121F00A3A; Tue, 7 Jul 2026 19:06:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783451198; bh=bOhoOM4hOcQqUzsvXhQz1H8YtW+B68Wkj0kvWsv9ysw=; h=Date:From:To:Cc:Subject:References; b=h91mvxoSmiGeQM8FkyaGYFZNxd9/IUcToDeSMIPvZRCL7a8UMwB0b0QBesp5xIbLU i7PsT94Sw2onA3+UmpAOBRZfRcPLnTsutjo1QPB6poAvdbvPFcNvVkGP1hB6jDLYDb RKWnZ0yte8HArLwcv9oJe3tjBUUeDOAyh5mMWkxYWu67e92T5hj3A/OUFslD9ZYdOb CoRjmiJVDNi/JotogxyAKQWnRnlRYa4L0e21jTcDihICBULLgdAZvlp5GRhmagJ2DT +Aa9ucQxYNr6w3TZVbEH8jmFMex+6xgUViSmWosj6uNAuMiuHhylsKUcB2NMwZIOYT B1ISbmvWG+Pgw== Date: Tue, 07 Jul 2026 21:06:36 +0200 Message-ID: <20260707190254.181086755@kernel.org> User-Agent: quilt/0.69 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , 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, Sven Schnelle , linux-s390@vger.kernel.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 10/18] entry: Use syscall number instead of rereading it References: <20260707181957.433213175@kernel.org> 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 rseq_syscall_enter_work() is invoked before the syscall number can be modified. So there is no point in rereading it from pt_regs. Signed-off-by: Thomas Gleixner --- include/linux/entry-common.h | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) --- a/include/linux/entry-common.h +++ b/include/linux/entry-common.h @@ -70,9 +70,10 @@ static inline void syscall_enter_audit(s } } -static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned long work) +static __always_inline long syscall_trace_enter(struct pt_regs *regs, unsigned long work, + long syscall) { - long syscall, ret = 0; + long ret = 0; /* * Handle Syscall User Dispatch. This must comes first, since @@ -90,7 +91,7 @@ static __always_inline long syscall_trac * through hrtimer_interrupt(). */ if (work & SYSCALL_WORK_SYSCALL_RSEQ_SLICE) - rseq_syscall_enter_work(syscall_get_nr(current, regs)); + rseq_syscall_enter_work(syscall); /* Handle ptrace */ if (work & (SYSCALL_WORK_SYSCALL_TRACE | SYSCALL_WORK_SYSCALL_EMU)) { @@ -145,7 +146,7 @@ static __always_inline long syscall_ente unsigned long work = READ_ONCE(current_thread_info()->syscall_work); if (work & SYSCALL_WORK_ENTER) - syscall = syscall_trace_enter(regs, work); + syscall = syscall_trace_enter(regs, work, syscall); return syscall; }