4.19-stable review patch. If anyone has any objections, please let me know.
------------------
[ Upstream commit 7ff1e34bbdc15acab823b1ee4240e94623d50ee8 ]
Fixes: arch/um/os-Linux/skas/process.c:613:1: warning: control reaches end of non-void function [-Wreturn-type]
longjmp() never returns but gcc still warns that the end of the function can be reached. Add a return code and debug aid to detect this impossible case.
Signed-off-by: Richard Weinberger richard@nod.at Signed-off-by: Sasha Levin sashal@kernel.org --- arch/um/os-Linux/skas/process.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index c94c3bd70ccd..df4a985716eb 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -610,6 +610,11 @@ int start_idle_thread(void *stack, jmp_buf *switch_buf) fatal_sigsegv(); } longjmp(*switch_buf, 1); + + /* unreachable */ + printk(UM_KERN_ERR "impossible long jump!"); + fatal_sigsegv(); + return 0; }
void initial_thread_cb_skas(void (*proc)(void *), void *arg)