linux-kernel - [tip: x86/core] x86: Mark stop_this_cpu() _

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Date:   Tue, 15 Mar 2022 10:43:49 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
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@...radead.org>
AuthorDate:    Tue, 08 Mar 2022 16:30:47 +01:00
Committer:     Peter Zijlstra <peterz@...radead.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@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.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)