linux-kernel - Re: [PATCH v4 3/5] x86/syscall: Mark exit[_group] syscall handlers _

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Message-ID: <20240503204417.2kxp2i3xjdmtapxq@treble>
Date: Fri, 3 May 2024 13:44:17 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Paul McKenney <paulmckrcu@...il.com>
Cc: "Paul E. McKenney" <paulmck@...nel.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alexandre Chartre <alexandre.chartre@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Nikolay Borisov <nik.borisov@...e.com>,
	KP Singh <kpsingh@...nel.org>, Waiman Long <longman@...hat.com>,
	Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v4 3/5] x86/syscall: Mark exit[_group] syscall handlers
 __noreturn

On Fri, May 03, 2024 at 12:57:00PM -0700, Josh Poimboeuf wrote:
> On Thu, May 02, 2024 at 04:48:13PM -0700, Paul McKenney wrote:
> > On Sun, Apr 21, 2024 at 2:47 PM Paul McKenney <paulmckrcu@...il.com> wrote:
> > >
> > > And this definitely helped, thank you!
> > >
> > > However, this one still remains:
> > >
> > > vmlinux.o: warning: objtool: ia32_sys_call+0x29b6:
> > > __ia32_sys_exit_group() is missing a __noreturn annotation
> > 
> > And looking at the patched code, this function looks to me to be
> > correctly marked.
> > 
> > No idea...  :-/
> 
> Ah, I think I missed fixing syscall_32.tbl.  Lemme see how to do that...

Can you try adding this on top?

diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 5f8591ce7f25..f30b608d14dc 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -12,7 +12,7 @@
 # The abi is always "i386" for this file.
 #
 0	i386	restart_syscall		sys_restart_syscall
-1	i386	exit			sys_exit
+1	i386	exit			sys_exit			0 noreturn
 2	i386	fork			sys_fork
 3	i386	read			sys_read
 4	i386	write			sys_write
@@ -263,7 +263,7 @@
 249	i386	io_cancel		sys_io_cancel
 250	i386	fadvise64		sys_ia32_fadvise64
 # 251 is available for reuse (was briefly sys_set_zone_reclaim)
-252	i386	exit_group		sys_exit_group
+252	i386	exit_group		sys_exit_group			0 noreturn
 253	i386	lookup_dcookie
 254	i386	epoll_create		sys_epoll_create
 255	i386	epoll_ctl		sys_epoll_ctl