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x86: Mark stop_this_cpu() __noreturn

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[ Upstream commit f9cdf7ca57cada055f61ef6d0eb4db21c3f200db ]

vmlinux.o: warning: objtool: smp_stop_nmi_callback()+0x2b: unreachable instruction

0000 0000000000047cf0 <smp_stop_nmi_callback>:
...
0026    47d16:  e8 00 00 00 00          call   47d1b <smp_stop_nmi_callback+0x2b>       47d17: R_X86_64_PLT32   stop_this_cpu-0x4
002b    47d1b:  b8 01 00 00 00          mov    $0x1,%eax

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154319.290905453@infradead.org
Stable-dep-of: c0dd9245aa9e ("x86/microcode: Check CPU capabilities after late microcode update correctly")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Peter Zijlstra
2022-03-08 16:30:47 +01:00
committed by Greg Kroah-Hartman
parent 3900b7de1d
commit 8078a170ba
3 changed files with 3 additions and 2 deletions
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2
arch/x86/include/asm/processor.h
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@@ -839,7 +839,7 @@ bool xen_set_default_idle(void);
#define xen_set_default_idle 0 #define xen_set_default_idle 0
#endif #endif
void stop_this_cpu(void *dummy); void __noreturn stop_this_cpu(void *dummy);
void microcode_check(void); void microcode_check(void);
enum l1tf_mitigations { enum l1tf_mitigations {

2
arch/x86/kernel/process.c
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@@ -720,7 +720,7 @@ bool xen_set_default_idle(void)
} }
#endif #endif
void stop_this_cpu(void *dummy) void __noreturn stop_this_cpu(void *dummy)
{ {
local_irq_disable(); local_irq_disable();
/* /*

1
tools/objtool/check.c
View File

@@ -180,6 +180,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"kunit_try_catch_throw", "kunit_try_catch_throw",
"xen_start_kernel", "xen_start_kernel",
"cpu_bringup_and_idle", "cpu_bringup_and_idle",
"stop_this_cpu",
}; };
if (!func) if (!func)