linux-kernel - [tip: x86/urgent] x86,objtool: Mark cpu_startup_entry() _

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Date:   Tue, 19 Apr 2022 20:08:42 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Rick Edgecombe <rick.p.edgecombe@...el.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86,objtool: Mark cpu_startup_entry() __noreturn

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     d4e5268a08b211b536fed29beb24271ecd85187e
Gitweb:        https://git.kernel.org/tip/d4e5268a08b211b536fed29beb24271ecd85187e
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Fri, 08 Apr 2022 11:45:55 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 19 Apr 2022 21:58:48 +02:00

x86,objtool: Mark cpu_startup_entry() __noreturn

GCC-8 isn't clever enough to figure out that cpu_start_entry() is a
noreturn while objtool is. This results in code after the call in
start_secondary(). Give GCC a hand so that they all agree on things.

  vmlinux.o: warning: objtool: start_secondary()+0x10e: unreachable

Reported-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lore.kernel.org/r/20220408094718.383658532@infradead.org
---
 include/linux/cpu.h   | 2 +-
 tools/objtool/check.c | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 9cf51e4..54dc2f9 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -167,7 +167,7 @@ static inline int suspend_disable_secondary_cpus(void) { return 0; }
 static inline void suspend_enable_secondary_cpus(void) { }
 #endif /* !CONFIG_PM_SLEEP_SMP */
 
-void cpu_startup_entry(enum cpuhp_state state);
+void __noreturn cpu_startup_entry(enum cpuhp_state state);
 
 void cpu_idle_poll_ctrl(bool enable);
 
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index bd0c2c8..e3a675d 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -184,6 +184,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"do_group_exit",
 		"stop_this_cpu",
 		"__invalid_creds",
+               "cpu_startup_entry",
 	};
 
 	if (!func)