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Message-ID: <20230201000247.3x3jev6xxxxkfrnm@treble> Date: Tue, 31 Jan 2023 16:02:47 -0800 From: Josh Poimboeuf <jpoimboe@...nel.org> To: "Paul E. McKenney" <paulmck@...nel.org> Cc: Peter Zijlstra <peterz@...radead.org>, sfr@...b.auug.org.au, linux-kernel@...r.kernel.org Subject: Re: objtool warning for next-20221118 On Sat, Jan 28, 2023 at 11:06:34AM -0800, Paul E. McKenney wrote: > Sorry to be a nag, but I am still seeing this. Not a huge problem because > I now filter it out so that it does not get in the way of other bugs, > but I figured that I should follow up. Does this fix it? (works for me) If so, I'll need to extend it for all arches. diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 40d156a31676..5db0daba750f 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -712,6 +712,7 @@ void arch_cpu_idle_enter(void) void arch_cpu_idle_dead(void) { play_dead(); + BUG(); } /* diff --git a/include/linux/cpu.h b/include/linux/cpu.h index 314802f98b9d..7fbbd1572288 100644 --- a/include/linux/cpu.h +++ b/include/linux/cpu.h @@ -185,7 +185,7 @@ void arch_cpu_idle(void); void arch_cpu_idle_prepare(void); void arch_cpu_idle_enter(void); void arch_cpu_idle_exit(void); -void arch_cpu_idle_dead(void); +void __noreturn arch_cpu_idle_dead(void); int cpu_report_state(int cpu); int cpu_check_up_prepare(int cpu); diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index f26ab2675f7d..921b8b3e3d0c 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -71,7 +71,7 @@ static noinline int __cpuidle cpu_idle_poll(void) void __weak arch_cpu_idle_prepare(void) { } void __weak arch_cpu_idle_enter(void) { } void __weak arch_cpu_idle_exit(void) { } -void __weak arch_cpu_idle_dead(void) { } +void __weak arch_cpu_idle_dead(void) { while (1); } void __weak arch_cpu_idle(void) { cpu_idle_force_poll = 1; diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 4b7c8b33069e..a9cb925bf095 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -167,6 +167,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func, "__reiserfs_panic", "__stack_chk_fail", "__ubsan_handle_builtin_unreachable", + "arch_cpu_idle_dead", "cpu_bringup_and_idle", "cpu_startup_entry", "do_exit",
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