4.9-stable review patch. If anyone has any objections, please let me know.
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[ 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 23025d645160..0a99d4515065 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -578,6 +578,11 @@ 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)