On Sat, Apr 28, 2012 at 12:15:26AM +0100, Al Viro wrote:
> I think all such architectures need that check lifted to do_notify_resume()
> (and the rest needs it killed, of course). Including x86, by the look
> of it - we _probably_ can't get there with TIF_NOTIFY_RESUME and
> !user_mode(regs), but I'm not entirely sure of that. arm is in about the
> same situation; alpha, ppc{32,64}, sparc{32,64} and m68k really can't get
> there like that (they all check it in the asm glue). mips probably might,
> unless I'm misreading their ret_from_fork()... Fun.
I'm completely unfamiliar with tile assembler, so I might be missing something
there, but AFAICS the following sequence can lead to do_signal() being
called for a kernel thread:
kernel_thread()
ret_from_fork() in child
.Lresume_userspace
do_work_pending()
do_signal()
and unlike many other, tile does _not_ check for !user_mode() anywhere
relevant... Broken?
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