[PATCH 02/11] init: Mark start_kernel() __noreturn

[Josh Poimboeuf]

Fixes the following warning:

  vmlinux.o: warning: objtool: x86_64_start_reservations+0x28: unreachable instruction

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Link: https://lore.kernel.org/r/202302161142.K3ziREaj-lkp@xxxxxxxxx/
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
 include/linux/start_kernel.h | 2 +-
 init/main.c                  | 2 +-
 tools/objtool/check.c        | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/start_kernel.h b/include/linux/start_kernel.h
index 864921e54c92..a9806a44a605 100644
--- a/include/linux/start_kernel.h
+++ b/include/linux/start_kernel.h
@@ -8,7 +8,7 @@
 /* Define the prototype for start_kernel here, rather than cluttering
    up something else. */
 
-extern asmlinkage void __init start_kernel(void);
+extern asmlinkage void __init __noreturn start_kernel(void);
 extern void __init __noreturn arch_call_rest_init(void);
 extern void __ref __noreturn rest_init(void);
 
diff --git a/init/main.c b/init/main.c
index 161ed956d738..65aab4e9bb49 100644
--- a/init/main.c
+++ b/init/main.c
@@ -937,7 +937,7 @@ static void __init print_unknown_bootoptions(void)
 	memblock_free(unknown_options, len);
 }
 
-asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
+asmlinkage __visible void __init __no_sanitize_address __noreturn start_kernel(void)
 {
 	char *command_line;
 	char *after_dashes;
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index e7442e7ad676..a6f9a4aeb77b 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -222,6 +222,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"rewind_stack_and_make_dead",
 		"sev_es_terminate",
 		"snp_abort",
+		"start_kernel",
 		"stop_this_cpu",
 		"usercopy_abort",
 		"xen_cpu_bringup_again",
-- 
2.39.2