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Subject[tip: x86/core] x86: Mark stop_this_cpu() __noreturn
The following commit has been merged into the x86/core branch of tip:

Commit-ID: f9cdf7ca57cada055f61ef6d0eb4db21c3f200db
Gitweb: https://git.kernel.org/tip/f9cdf7ca57cada055f61ef6d0eb4db21c3f200db
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Tue, 08 Mar 2022 16:30:47 +01:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 15 Mar 2022 10:32:43 +01:00

x86: Mark stop_this_cpu() __noreturn

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
---
arch/x86/include/asm/processor.h | 2 +-
arch/x86/kernel/process.c | 2 +-
tools/objtool/check.c | 1 +
3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 2c5f12a..dd34100 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -835,7 +835,7 @@ bool xen_set_default_idle(void);
#define xen_set_default_idle 0
#endif

-void stop_this_cpu(void *dummy);
+void __noreturn stop_this_cpu(void *dummy);
void microcode_check(void);

enum l1tf_mitigations {
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 81d8ef0..a057a5c 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -747,7 +747,7 @@ bool xen_set_default_idle(void)
}
#endif

-void stop_this_cpu(void *dummy)
+void __noreturn stop_this_cpu(void *dummy)
{
local_irq_disable();
/*
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 0e0e5b5..c3ddcec 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -181,6 +181,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"kunit_try_catch_throw",
"xen_start_kernel",
"cpu_bringup_and_idle",
+ "stop_this_cpu",
};

if (!func)
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