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cpu: Mark nmi_panic_self_stop() __noreturn

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In preparation for improving objtool's handling of weak noreturn
functions, mark nmi_panic_self_stop() __noreturn.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/316fc6dfab5a8c4e024c7185484a1ee5fb0afb79.1681342859.git.jpoimboe@kernel.org
This commit is contained in:
Josh Poimboeuf 2023-04-12 16:49:36 -07:00 committed by Peter Zijlstra
parent 7412a60dec
commit 27dea14c7f
5 changed files with 4 additions and 4 deletions
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1
arch/x86/include/asm/reboot.h
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@ -28,7 +28,6 @@ void __noreturn machine_real_restart(unsigned int type);
void cpu_emergency_disable_virtualization(void);
typedef void (*nmi_shootdown_cb)(int, struct pt_regs*);
void nmi_panic_self_stop(struct pt_regs *regs);
void nmi_shootdown_cpus(nmi_shootdown_cb callback);
void run_crash_ipi_callback(struct pt_regs *regs);

2
arch/x86/kernel/reboot.c
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@ -920,7 +920,7 @@ void run_crash_ipi_callback(struct pt_regs *regs)
}
/* Override the weak function in kernel/panic.c */
void nmi_panic_self_stop(struct pt_regs *regs)
void __noreturn nmi_panic_self_stop(struct pt_regs *regs)
{
while (1) {
/* If no CPU is preparing crash dump, we simply loop here. */

2
include/linux/smp.h
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@ -60,7 +60,7 @@ int smp_call_function_single_async(int cpu, struct __call_single_data *csd);
* Architecture-dependent code may override them.
*/
void __noreturn panic_smp_self_stop(void);
void nmi_panic_self_stop(struct pt_regs *regs);
void __noreturn nmi_panic_self_stop(struct pt_regs *regs);
void crash_smp_send_stop(void);
/*

2
kernel/panic.c
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@ -151,7 +151,7 @@ void __weak __noreturn panic_smp_self_stop(void)
* Stop ourselves in NMI context if another CPU has already panicked. Arch code
* may override this to prepare for crash dumping, e.g. save regs info.
*/
void __weak nmi_panic_self_stop(struct pt_regs *regs)
void __weak __noreturn nmi_panic_self_stop(struct pt_regs *regs)
{
panic_smp_self_stop();
}

1
tools/objtool/check.c
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@ -217,6 +217,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"lbug_with_loc",
"machine_real_restart",
"make_task_dead",
"nmi_panic_self_stop",
"panic",
"panic_smp_self_stop",
"rest_init",