linux-kernel - [tip: objtool/core] x86/cpu: Mark {hlt,resume}_play_dead() _

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Date:   Mon, 17 Apr 2023 10:46:45 -0000
From:   "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     kernel test robot <lkp@...el.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] x86/cpu: Mark {hlt,resume}_play_dead() __noreturn

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     52668badd34b4b346f32c33a9bcba069a06c3caa
Gitweb:        https://git.kernel.org/tip/52668badd34b4b346f32c33a9bcba069a06c3caa
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Wed, 12 Apr 2023 16:49:39 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Fri, 14 Apr 2023 17:31:27 +02:00

x86/cpu: Mark {hlt,resume}_play_dead() __noreturn

Fixes the following warning:

  vmlinux.o: warning: objtool: resume_play_dead+0x21: unreachable instruction

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/r/ce1407c4bf88b1334fe40413126343792a77ca50.1681342859.git.jpoimboe@kernel.org
---
 arch/x86/include/asm/smp.h | 2 +-
 arch/x86/kernel/smpboot.c  | 2 +-
 arch/x86/power/cpu.c       | 2 +-
 tools/objtool/check.c      | 2 ++
 4 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index e6d1d28..47ce4c7 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -125,7 +125,7 @@ int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 int native_cpu_disable(void);
 int common_cpu_die(unsigned int cpu);
 void native_cpu_die(unsigned int cpu);
-void hlt_play_dead(void);
+void __noreturn hlt_play_dead(void);
 void native_play_dead(void);
 void play_dead_common(void);
 void wbinvd_on_cpu(int cpu);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 9013bb2..a6da3f9 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1816,7 +1816,7 @@ static inline void mwait_play_dead(void)
 	}
 }
 
-void hlt_play_dead(void)
+void __noreturn hlt_play_dead(void)
 {
 	if (__this_cpu_read(cpu_info.x86) >= 4)
 		wbinvd();
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index 236447e..7a4d5e9 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -288,7 +288,7 @@ EXPORT_SYMBOL(restore_processor_state);
 #endif
 
 #if defined(CONFIG_HIBERNATION) && defined(CONFIG_HOTPLUG_CPU)
-static void resume_play_dead(void)
+static void __noreturn resume_play_dead(void)
 {
 	play_dead_common();
 	tboot_shutdown(TB_SHUTDOWN_WFS);
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index ceb9848..724a63b 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -212,6 +212,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"do_task_dead",
 		"ex_handler_msr_mce",
 		"fortify_panic",
+		"hlt_play_dead",
 		"kthread_complete_and_exit",
 		"kthread_exit",
 		"kunit_try_catch_throw",
@@ -222,6 +223,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"panic",
 		"panic_smp_self_stop",
 		"rest_init",
+		"resume_play_dead",
 		"rewind_stack_and_make_dead",
 		"sev_es_terminate",
 		"snp_abort",