From: Josh Poimboeuf <jpoimboe@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: jgross@suse.com, richard.henderson@linaro.org,
ink@jurassic.park.msu.ru, mattst88@gmail.com,
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vschneid@redhat.com, paulmck@kernel.org
Subject: [PATCH 19/22] xtensa/cpu: Make sure cpu_die() doesn't return
Date: Fri, 3 Feb 2023 14:05:28 -0800 [thread overview]
Message-ID: <13cfde410b50047d778f535d12d928813e92c745.1675461757.git.jpoimboe@kernel.org> (raw)
In-Reply-To: <cover.1675461757.git.jpoimboe@kernel.org>
cpu_die() doesn't return. Make that more explicit with a BUG().
BUG() is preferable to unreachable() because BUG() is a more explicit
failure mode and avoids undefined behavior like falling off the edge of
the function into whatever code happens to be next.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
arch/xtensa/kernel/smp.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/xtensa/kernel/smp.c b/arch/xtensa/kernel/smp.c
index 4dc109dd6214..7bad78495536 100644
--- a/arch/xtensa/kernel/smp.c
+++ b/arch/xtensa/kernel/smp.c
@@ -341,6 +341,8 @@ void __ref cpu_die(void)
__asm__ __volatile__(
" movi a2, cpu_restart\n"
" jx a2\n");
+
+ BUG();
}
#endif /* CONFIG_HOTPLUG_CPU */
--
2.39.0
next prev parent reply other threads:[~2023-02-03 22:08 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-03 22:05 [PATCH 00/22] cpu,sched: Mark arch_cpu_idle_dead() __noreturn Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 01/22] alpha/cpu: Expose arch_cpu_idle_dead()'s prototype declaration Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 02/22] alpha/cpu: Make sure arch_cpu_idle_dead() doesn't return Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 03/22] arm/cpu: " Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 04/22] arm64/cpu: Mark cpu_die() __noreturn Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 05/22] csky/cpu: Make sure arch_cpu_idle_dead() doesn't return Josh Poimboeuf
2023-02-04 1:12 ` Guo Ren
2023-02-04 2:29 ` Josh Poimboeuf
2023-02-06 3:11 ` Guo Ren
2023-02-03 22:05 ` [PATCH 06/22] ia64/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 07/22] loongarch/cpu: Make sure play_dead() doesn't return Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 08/22] loongarch/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 09/22] mips/cpu: Expose play_dead()'s prototype definition Josh Poimboeuf
2023-02-06 22:36 ` Florian Fainelli
2023-02-03 22:05 ` [PATCH 10/22] mips/cpu: Make sure play_dead() doesn't return Josh Poimboeuf
2023-02-06 22:36 ` Florian Fainelli
2023-02-03 22:05 ` [PATCH 11/22] mips/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-06 22:36 ` Florian Fainelli
2023-02-03 22:05 ` [PATCH 12/22] powerpc/cpu: Mark start_secondary_resume() __noreturn Josh Poimboeuf
2023-02-06 11:10 ` Michael Ellerman
2023-02-06 22:22 ` Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 13/22] sh/cpu: Make sure play_dead() doesn't return Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 14/22] sh/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 15/22] sh/cpu: Expose arch_cpu_idle_dead()'s prototype definition Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 16/22] sparc/cpu: Mark cpu_play_dead() __noreturn Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 17/22] x86/cpu: Make sure play_dead() doesn't return Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 18/22] x86/cpu: Mark play_dead() __noreturn Josh Poimboeuf
2023-02-03 22:05 ` Josh Poimboeuf [this message]
2023-02-03 22:05 ` [PATCH 20/22] xtensa/cpu: Mark cpu_die() __noreturn Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 21/22] sched/idle: Make sure weak version of arch_cpu_idle_dead() doesn't return Josh Poimboeuf
2023-02-03 22:05 ` [PATCH 22/22] sched/idle: Mark arch_cpu_idle_dead() __noreturn Josh Poimboeuf
2023-02-07 17:33 ` [PATCH v1.1 " Josh Poimboeuf
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