From 9ea7e6b62c2bd2f7bbfc3f10099df803002dd33b Mon Sep 17 00:00:00 2001 From: Josh Poimboeuf Date: Wed, 12 Apr 2023 16:49:31 -0700 Subject: [PATCH] init: Mark [arch_call_]rest_init() __noreturn In preparation for improving objtool's handling of weak noreturn functions, mark start_kernel(), arch_call_rest_init(), and rest_init() __noreturn. Signed-off-by: Josh Poimboeuf Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Nick Desaulniers Link: https://lore.kernel.org/r/7194ed8a989a85b98d92e62df660f4a90435a723.1681342859.git.jpoimboe@kernel.org --- arch/s390/kernel/setup.c | 2 +- include/linux/start_kernel.h | 4 ++-- init/main.c | 4 ++-- tools/objtool/check.c | 2 ++ 4 files changed, 7 insertions(+), 5 deletions(-) diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index 8ec5cdf9dadc..4259b6c50516 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -396,7 +396,7 @@ int __init arch_early_irq_init(void) return 0; } -void __init arch_call_rest_init(void) +void __init __noreturn arch_call_rest_init(void) { unsigned long stack; diff --git a/include/linux/start_kernel.h b/include/linux/start_kernel.h index 8b369a41c03c..864921e54c92 100644 --- a/include/linux/start_kernel.h +++ b/include/linux/start_kernel.h @@ -9,7 +9,7 @@ up something else. */ extern asmlinkage void __init start_kernel(void); -extern void __init arch_call_rest_init(void); -extern void __ref rest_init(void); +extern void __init __noreturn arch_call_rest_init(void); +extern void __ref __noreturn rest_init(void); #endif /* _LINUX_START_KERNEL_H */ diff --git a/init/main.c b/init/main.c index 4425d1783d5c..161ed956d738 100644 --- a/init/main.c +++ b/init/main.c @@ -683,7 +683,7 @@ static void __init setup_command_line(char *command_line) static __initdata DECLARE_COMPLETION(kthreadd_done); -noinline void __ref rest_init(void) +noinline void __ref __noreturn rest_init(void) { struct task_struct *tsk; int pid; @@ -889,7 +889,7 @@ static int __init early_randomize_kstack_offset(char *buf) early_param("randomize_kstack_offset", early_randomize_kstack_offset); #endif -void __init __weak arch_call_rest_init(void) +void __init __weak __noreturn arch_call_rest_init(void) { rest_init(); } diff --git a/tools/objtool/check.c b/tools/objtool/check.c index df634dafefc4..3d7227f0ea2a 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -202,6 +202,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func, "__reiserfs_panic", "__stack_chk_fail", "__ubsan_handle_builtin_unreachable", + "arch_call_rest_init", "arch_cpu_idle_dead", "cpu_bringup_and_idle", "cpu_startup_entry", @@ -217,6 +218,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func, "machine_real_restart", "make_task_dead", "panic", + "rest_init", "rewind_stack_and_make_dead", "sev_es_terminate", "snp_abort",