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Subject[PATCH v4 37/45] exit: Mark do_group_exit() __noreturn
vmlinux.o: warning: objtool: get_signal()+0x108: unreachable instruction

0000 000000000007f930 <get_signal>:
...
0103 7fa33: e8 00 00 00 00 call 7fa38 <get_signal+0x108> 7fa34: R_X86_64_PLT32 do_group_exit-0x4
0108 7fa38: 41 8b 45 74 mov 0x74(%r13),%eax

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
include/linux/sched/task.h | 2 +-
kernel/exit.c | 2 +-
tools/objtool/check.c | 1 +
3 files changed, 3 insertions(+), 2 deletions(-)

--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -79,7 +79,7 @@ static inline void exit_thread(struct ta
{
}
#endif
-extern void do_group_exit(int);
+extern __noreturn void do_group_exit(int);

extern void exit_files(struct task_struct *);
extern void exit_itimers(struct signal_struct *);
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -907,7 +907,7 @@ SYSCALL_DEFINE1(exit, int, error_code)
* Take down every thread in the group. This is called by fatal signals
* as well as by sys_exit_group (below).
*/
-void
+void __noreturn
do_group_exit(int exit_code)
{
struct signal_struct *sig = current->signal;
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -181,6 +181,7 @@ static bool __dead_end_function(struct o
"kunit_try_catch_throw",
"xen_start_kernel",
"cpu_bringup_and_idle",
+ "do_group_exit",
"stop_this_cpu",
};


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