From: Josh Poimboeuf <jpoimboe@kernel.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: "Philippe Mathieu-Daudé" <philmd@linaro.org>,
juri.lelli@redhat.com, dalias@libc.org,
linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
peterz@infradead.org, catalin.marinas@arm.com,
dave.hansen@linux.intel.com, x86@kernel.org,
jiaxun.yang@flygoat.com, linux-mips@vger.kernel.org,
bsegall@google.com, jcmvbkbc@gmail.com, guoren@kernel.org,
hpa@zytor.com, sparclinux@vger.kernel.org, kernel@xen0n.name,
will@kernel.org, vschneid@redhat.com, f.fainelli@gmail.com,
vincent.guittot@linaro.org, ysato@users.sourceforge.jp,
chenhuacai@kernel.org, linux@armlinux.org.uk,
linux-csky@vger.kernel.org, dietmar.eggemann@arm.com,
mingo@redhat.com, bcm-kernel-feedback-list@broadcom.com,
mgorman@suse.de, mattst88@gmail.com,
linux-xtensa@linux-xtensa.org, paulmck@kernel.org,
richard.henderson@linaro.org, npiggin@gmail.com,
ink@jurassic.park.msu.ru, rostedt@goodmis.org,
loongarch@lists.linux.dev, tglx@linutronix.de,
linux-arm-kernel@lists.infradead.org, jgross@suse.com,
chris@zankel.net, tsbogend@alpha.franken.de, bristot@redhat.com,
linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
bp@alien8.de, linuxppc-dev@lists.ozlabs.org, davem@davemloft.net
Subject: Re: [PATCH v2 04/24] arm64/cpu: Mark cpu_die() __noreturn
Date: Wed, 15 Feb 2023 11:45:38 -0800 [thread overview]
Message-ID: <20230215194538.aiiris3uabnuvkkg@treble> (raw)
In-Reply-To: <Y+zZgZIP7RPIgyQf@FVFF77S0Q05N>
On Wed, Feb 15, 2023 at 01:09:21PM +0000, Mark Rutland wrote:
> On Tue, Feb 14, 2023 at 09:13:08AM +0100, Philippe Mathieu-Daudé wrote:
> > On 14/2/23 08:05, Josh Poimboeuf wrote:
> > > cpu_die() doesn't return. Annotate it as such. By extension this also
> > > makes arch_cpu_idle_dead() noreturn.
> > >
> > > Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
> > > ---
> > > arch/arm64/include/asm/smp.h | 2 +-
> > > 1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h
> > > index fc55f5a57a06..5733a31bab08 100644
> > > --- a/arch/arm64/include/asm/smp.h
> > > +++ b/arch/arm64/include/asm/smp.h
> > > @@ -100,7 +100,7 @@ static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
> > > extern int __cpu_disable(void);
> > > extern void __cpu_die(unsigned int cpu);
> > > -extern void cpu_die(void);
> > > +extern void __noreturn cpu_die(void);
> > > extern void cpu_die_early(void);
> >
> > Shouldn't cpu_operations::cpu_die() be declared noreturn first?
>
> The cpu_die() function ends with a BUG(), and so does not return, even if a
> cpu_operations::cpu_die() function that it calls erroneously returned.
>
> We *could* mark cpu_operations::cpu_die() as noreturn, but I'd prefer that we
> did not so that the compiler doesn't optimize away the BUG() which is there to
> catch such erroneous returns.
>
> That said, could we please add __noreturn to the implementation of cpu_die() in
> arch/arm64/kernel/smp.c? i.e. the fixup below.
Done.
> With that fixup:
>
> Acked-by: Mark Rutland <mark.rutland@arm.com>
Thanks!
--
Josh
next prev parent reply other threads:[~2023-02-15 19:45 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-14 7:05 [PATCH v2 00/24] cpu,sched: Mark arch_cpu_idle_dead() __noreturn Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 01/24] alpha/cpu: Expose arch_cpu_idle_dead()'s prototype declaration Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 02/24] alpha/cpu: Make sure arch_cpu_idle_dead() doesn't return Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 03/24] arm/cpu: " Josh Poimboeuf
2023-02-14 11:15 ` Russell King (Oracle)
2023-02-14 18:39 ` Josh Poimboeuf
2023-02-14 22:01 ` Russell King (Oracle)
2023-02-16 18:38 ` [PATCH v2.1 03/24] arm/cpu: Add unreachable() to arch_cpu_idle_dead() Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 04/24] arm64/cpu: Mark cpu_die() __noreturn Josh Poimboeuf
2023-02-14 8:13 ` Philippe Mathieu-Daudé
2023-02-15 13:09 ` Mark Rutland
2023-02-15 19:45 ` Josh Poimboeuf [this message]
2023-02-16 18:41 ` [PATCH v2.1 " Josh Poimboeuf
2023-03-02 10:55 ` Philippe Mathieu-Daudé
2023-02-14 7:05 ` [PATCH v2 05/24] csky/cpu: Make sure arch_cpu_idle_dead() doesn't return Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 06/24] ia64/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-14 8:07 ` Philippe Mathieu-Daudé
2023-02-14 7:05 ` [PATCH v2 07/24] loongarch/cpu: Make sure play_dead() doesn't return Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 08/24] loongarch/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-14 8:06 ` Philippe Mathieu-Daudé
2023-02-14 7:05 ` [PATCH v2 09/24] mips/cpu: Expose play_dead()'s prototype definition Josh Poimboeuf
2023-02-14 7:46 ` Philippe Mathieu-Daudé
2023-02-14 18:11 ` Josh Poimboeuf
2023-02-15 8:29 ` Philippe Mathieu-Daudé
2023-02-16 18:42 ` [PATCH v2.1 " Josh Poimboeuf
2023-03-01 18:16 ` Josh Poimboeuf
2023-03-02 10:54 ` Philippe Mathieu-Daudé
2023-02-14 7:05 ` [PATCH v2 10/24] mips/cpu: Make sure play_dead() doesn't return Josh Poimboeuf
2023-02-14 7:50 ` Philippe Mathieu-Daudé
2023-02-14 7:05 ` [PATCH v2 11/24] mips/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-14 7:50 ` Philippe Mathieu-Daudé
2023-02-14 7:05 ` [PATCH v2 12/24] powerpc/cpu: Mark start_secondary_resume() __noreturn Josh Poimboeuf
2023-02-14 7:19 ` Christophe Leroy
2023-02-14 7:05 ` [PATCH v2 13/24] sh/cpu: Make sure play_dead() doesn't return Josh Poimboeuf
2023-02-14 7:57 ` Philippe Mathieu-Daudé
2023-02-14 18:28 ` Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 14/24] sh/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 15/24] sh/cpu: Expose arch_cpu_idle_dead()'s prototype definition Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 16/24] sparc/cpu: Mark cpu_play_dead() __noreturn Josh Poimboeuf
2023-02-14 7:52 ` Philippe Mathieu-Daudé
2023-02-14 7:05 ` [PATCH v2 17/24] x86/cpu: Make sure play_dead() doesn't return Josh Poimboeuf
2023-02-14 8:05 ` Philippe Mathieu-Daudé
2023-02-14 7:05 ` [PATCH v2 18/24] x86/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 19/24] xtensa/cpu: Make sure cpu_die() doesn't return Josh Poimboeuf
2023-02-14 7:55 ` Philippe Mathieu-Daudé
2023-02-14 18:23 ` Josh Poimboeuf
2023-02-14 19:29 ` Steven Rostedt
2023-02-14 19:48 ` Max Filippov
2023-02-14 20:19 ` Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 20/24] xtensa/cpu: Mark cpu_die() __noreturn Josh Poimboeuf
2023-02-14 12:47 ` Max Filippov
2023-02-14 7:05 ` [PATCH v2 21/24] sched/idle: Make sure weak version of arch_cpu_idle_dead() doesn't return Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 22/24] objtool: Include weak functions in 'global_noreturns' check Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 23/24] init: Make arch_call_rest_init() and rest_init() __noreturn Josh Poimboeuf
2023-02-14 7:05 ` [PATCH v2 24/24] sched/idle: Mark arch_cpu_idle_dead() __noreturn Josh Poimboeuf
2023-02-14 9:25 ` [PATCH v2 00/24] cpu,sched: " Philippe Mathieu-Daudé
2023-02-14 18:29 ` Josh Poimboeuf
2023-02-15 22:22 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230215194538.aiiris3uabnuvkkg@treble \
--to=jpoimboe@kernel.org \
--cc=bcm-kernel-feedback-list@broadcom.com \
--cc=bp@alien8.de \
--cc=bristot@redhat.com \
--cc=bsegall@google.com \
--cc=catalin.marinas@arm.com \
--cc=chenhuacai@kernel.org \
--cc=chris@zankel.net \
--cc=dalias@libc.org \
--cc=dave.hansen@linux.intel.com \
--cc=davem@davemloft.net \
--cc=dietmar.eggemann@arm.com \
--cc=f.fainelli@gmail.com \
--cc=guoren@kernel.org \
--cc=hpa@zytor.com \
--cc=ink@jurassic.park.msu.ru \
--cc=jcmvbkbc@gmail.com \
--cc=jgross@suse.com \
--cc=jiaxun.yang@flygoat.com \
--cc=juri.lelli@redhat.com \
--cc=kernel@xen0n.name \
--cc=linux-alpha@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-csky@vger.kernel.org \
--cc=linux-ia64@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-sh@vger.kernel.org \
--cc=linux-xtensa@linux-xtensa.org \
--cc=linux@armlinux.org.uk \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=loongarch@lists.linux.dev \
--cc=mark.rutland@arm.com \
--cc=mattst88@gmail.com \
--cc=mgorman@suse.de \
--cc=mingo@redhat.com \
--cc=npiggin@gmail.com \
--cc=paulmck@kernel.org \
--cc=peterz@infradead.org \
--cc=philmd@linaro.org \
--cc=richard.henderson@linaro.org \
--cc=rostedt@goodmis.org \
--cc=sparclinux@vger.kernel.org \
--cc=tglx@linutronix.de \
--cc=tsbogend@alpha.franken.de \
--cc=vincent.guittot@linaro.org \
--cc=vschneid@redhat.com \
--cc=will@kernel.org \
--cc=x86@kernel.org \
--cc=ysato@users.sourceforge.jp \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).