[PATCH 14/27] panic: Mark abort() __noreturn

[Josh Poimboeuf <jpoimboe@kernel.org>]

abort() is a C compiler builtin interface, so compilers already know it
doesn't return, but mark it as such explicitly for documentation
purposes.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 arch/arc/kernel/traps.c | 4 +++-
 arch/arm/kernel/traps.c | 2 +-
 include/linux/panic.h   | 2 +-
 kernel/exit.c           | 2 +-
 4 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arc/kernel/traps.c b/arch/arc/kernel/traps.c
index 8d2ea2cbd98b0..803c131c6aa78 100644
--- a/arch/arc/kernel/traps.c
+++ b/arch/arc/kernel/traps.c
@@ -153,7 +153,9 @@ void do_insterror_or_kprobe(unsigned long address, struct pt_regs *regs)
 /*
  * abort() call generated by older gcc for __builtin_trap()
  */
-void abort(void)
+void __noreturn abort(void)
 {
 	__asm__ __volatile__("trap_s  5\n");
+
+	unreachable();
 }
diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c
index afbd2ebe5c39d..a3bd26d41612f 100644
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@@ -777,7 +777,7 @@ asmlinkage void __div0(void)
 }
 EXPORT_SYMBOL(__div0);
 
-void abort(void)
+void __noreturn abort(void)
 {
 	BUG();
 
diff --git a/include/linux/panic.h b/include/linux/panic.h
index f1dd417e54b29..da8778360dadf 100644
--- a/include/linux/panic.h
+++ b/include/linux/panic.h
@@ -33,7 +33,7 @@ extern int sysctl_panic_on_stackoverflow;
 extern bool crash_kexec_post_notifiers;
 
 extern void __stack_chk_fail(void);
-void abort(void);
+void abort(void) __noreturn;
 
 /*
  * panic_cpu is used for synchronizing panic() and crash_kexec() execution. It
diff --git a/kernel/exit.c b/kernel/exit.c
index 2c0b1c02920f4..2c55dc0fbbec8 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -2028,7 +2028,7 @@ COMPAT_SYSCALL_DEFINE5(waitid,
  *
  * See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88345#c11
  */
-__weak __function_aligned void abort(void)
+__weak __function_aligned void __noreturn abort(void)
 {
 	BUG();
 
-- 
2.55.0