From: Peter Zijlstra Date: Tue, 8 Mar 2022 15:30:47 +0000 (+0100) Subject: x86: Mark stop_this_cpu() __noreturn X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f9cdf7ca57cada055f61ef6d0eb4db21c3f200db;p=linux.git x86: Mark stop_this_cpu() __noreturn vmlinux.o: warning: objtool: smp_stop_nmi_callback()+0x2b: unreachable instruction 0000 0000000000047cf0 : ... 0026 47d16: e8 00 00 00 00 call 47d1b 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) Acked-by: Josh Poimboeuf Link: https://lore.kernel.org/r/20220308154319.290905453@infradead.org --- diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 2c5f12ae7d042..dd34100455d20 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 81d8ef036637c..a057a5c08618c 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 0e0e5b5a72c80..c3ddcecdab57a 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)