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x86/cpu: Mark {hlt,resume}_play_dead() __noreturn

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Fixes the following warning:

  vmlinux.o: warning: objtool: resume_play_dead+0x21: unreachable instruction

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/ce1407c4bf88b1334fe40413126343792a77ca50.1681342859.git.jpoimboe@kernel.org
This commit is contained in:
Josh Poimboeuf 2023-04-12 16:49:39 -07:00 committed by Peter Zijlstra
parent 09c5ae30d0
commit 52668badd3
4 changed files with 5 additions and 3 deletions
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2
arch/x86/include/asm/smp.h
View File

@ -125,7 +125,7 @@ int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
int native_cpu_disable(void);
int common_cpu_die(unsigned int cpu);
void native_cpu_die(unsigned int cpu);
void hlt_play_dead(void);
void __noreturn hlt_play_dead(void);
void native_play_dead(void);
void play_dead_common(void);
void wbinvd_on_cpu(int cpu);

2
arch/x86/kernel/smpboot.c
View File

@ -1816,7 +1816,7 @@ static inline void mwait_play_dead(void)
}
}
void hlt_play_dead(void)
void __noreturn hlt_play_dead(void)
{
if (__this_cpu_read(cpu_info.x86) >= 4)
wbinvd();

2
arch/x86/power/cpu.c
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@ -288,7 +288,7 @@ EXPORT_SYMBOL(restore_processor_state);
#endif
#if defined(CONFIG_HIBERNATION) && defined(CONFIG_HOTPLUG_CPU)
static void resume_play_dead(void)
static void __noreturn resume_play_dead(void)
{
play_dead_common();
tboot_shutdown(TB_SHUTDOWN_WFS);

2
tools/objtool/check.c
View File

@ -212,6 +212,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"do_task_dead",
"ex_handler_msr_mce",
"fortify_panic",
"hlt_play_dead",
"kthread_complete_and_exit",
"kthread_exit",
"kunit_try_catch_throw",
@ -222,6 +223,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"panic",
"panic_smp_self_stop",
"rest_init",
"resume_play_dead",
"rewind_stack_and_make_dead",
"sev_es_terminate",
"snp_abort",