From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.mindbit.ro (xs1.mindbit.ro [80.86.107.70]) (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 ABBDD3F0AA9; Wed, 8 Jul 2026 21:40:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.86.107.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783546822; cv=none; b=ZNuopx4u6yfIC37WJotDX6CqR0iuRSLKeKpLdcVOOUD3Xv1KJAoiXTOtXr7It/0mu38j0psdB2zb0vio7LiA3vFNh7KRTWTVSEJ7ARqByPlehikTBDcMjzqLd5nk0JWAFBiTn+vvyFL35yQUMFp5GDwoh6xUfwBkZV7NxwGEBQM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783546822; c=relaxed/simple; bh=06X0wts/VWiidyiW7nEPWVVzTkue+gIEbtnmzGNDpCM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=rDEzU7iXzJPw60qMH7JuBQDc+qS1ktyZa7v0mXeSriYFYGSDMVKeTN1pljCr5bRSQd8eoYzk7l2TD4PDWtIPh/TlKyBMvZ/MyM1yqBWNxk1dtAecO/XRzwzGWAotU0akzcf8ta/uM2PXNdXFY87DrCUKX9S/uzeBExXmQXE5W3s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=rendec.net; spf=pass smtp.mailfrom=rendec.net; dkim=pass (2048-bit key) header.d=rendec.net header.i=@rendec.net header.b=Vxaj5QTr; arc=none smtp.client-ip=80.86.107.70 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=rendec.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rendec.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rendec.net header.i=@rendec.net header.b="Vxaj5QTr" Received: from bat.kanata.rendec.net (unknown [24.114.111.125]) by mail.mindbit.ro (Postfix) with ESMTPSA id 362D5C2A88; Thu, 9 Jul 2026 00:39:55 +0300 (EEST) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.mindbit.ro 362D5C2A88 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rendec.net; s=default; t=1783546818; bh=vh8LzxdSEB6LZ5YWToq98HafI55oS8+SMbKFy7UAtCc=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=Vxaj5QTrZmnMb8kgo0DAnYKLpgF1VNrrEnZhf9ONVOiUDzl0XehMr6So/mzP7wSyL f/bqBaPzsa1UU5XOryNPd/7wb5rGQ7IwzXh6waI3HHJA4HLb35t2X+7MMwejCU49/V wyf2N0EPqZ3qOvz85kyJv8Z4VVG4eamp/AsyfiC+iferCPdwrWRhhI2Gihi8EYWMG6 w9oTc7WxIT/1nxUO9bTb5BDnYHc4NJdQoeD9M4hXia3YTHnUvNPgR3MY/vwUlZnDJN KsGLwDIHTElRb68oeRo724l+p50zYouaHMInNxEVvF4Rx2YclHGHsHkUSx9MW9gMJA BLbx/jCYTxmsw== Message-ID: <0f3a6ccaadc1d330215416d9cec13263d71b685e.camel@rendec.net> Subject: Re: [patch 10/18] entry: Use syscall number instead of rereading it From: Radu Rendec To: Thomas Gleixner , 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, Michal =?ISO-8859-1?Q?Such=E1nek?= , Jonathan Corbet , linux-doc@vger.kernel.org Date: Wed, 08 Jul 2026 17:39:50 -0400 In-Reply-To: <20260707190254.181086755@kernel.org> References: <20260707181957.433213175@kernel.org> <20260707190254.181086755@kernel.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-07-07 at 21:06 +0200, Thomas Gleixner wrote: > rseq_syscall_enter_work() is invoked before the syscall number can be > modified. So there is no point in rereading it from pt_regs. >=20 > Signed-off-by: Thomas Gleixner > --- > =C2=A0include/linux/entry-common.h |=C2=A0=C2=A0=C2=A0 9 +++++---- > =C2=A01 file changed, 5 insertions(+), 4 deletions(-) >=20 > --- a/include/linux/entry-common.h > +++ b/include/linux/entry-common.h > @@ -70,9 +70,10 @@ static inline void syscall_enter_audit(s > =C2=A0 } > =C2=A0} > =C2=A0 > -static __always_inline long syscall_trace_enter(struct pt_regs *regs, un= signed long work) > +static __always_inline long syscall_trace_enter(struct pt_regs *regs, un= signed long work, > + long syscall) > =C2=A0{ > - long syscall, ret =3D 0; > + long ret =3D 0; > =C2=A0 > =C2=A0 /* > =C2=A0 * Handle Syscall User Dispatch.=C2=A0 This must comes first, sinc= e > @@ -90,7 +91,7 @@ static __always_inline long syscall_trac > =C2=A0 * through hrtimer_interrupt(). > =C2=A0 */ > =C2=A0 if (work & SYSCALL_WORK_SYSCALL_RSEQ_SLICE) > - rseq_syscall_enter_work(syscall_get_nr(current, regs)); > + rseq_syscall_enter_work(syscall); > =C2=A0 > =C2=A0 /* Handle ptrace */ > =C2=A0 if (work & (SYSCALL_WORK_SYSCALL_TRACE | SYSCALL_WORK_SYSCALL_EMU)= ) { > @@ -145,7 +146,7 @@ static __always_inline long syscall_ente > =C2=A0 unsigned long work =3D READ_ONCE(current_thread_info()->syscall_wo= rk); > =C2=A0 > =C2=A0 if (work & SYSCALL_WORK_ENTER) > - syscall =3D syscall_trace_enter(regs, work); > + syscall =3D syscall_trace_enter(regs, work, syscall); > =C2=A0 > =C2=A0 return syscall; > =C2=A0} Reviewed-by: Radu Rendec