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um: Give start_idle_thread() a return code

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[ Upstream commit 7ff1e34bbd ]

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>
This commit is contained in:
Richard Weinberger 2018-06-15 16:42:56 +02:00 committed by Greg Kroah-Hartman
parent 6cddd65095
commit d21e4ba36f
1 changed files with 5 additions and 0 deletions
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5
arch/um/os-Linux/skas/process.c
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@ -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)