On Wed, Mar 21, 2018 at 08:32:31AM +0100, Christoph Hellwig wrote:

This is the io_getevents equivalent of ppoll/pselect and allows to
properly mix signals and aio completions (especially with IOCB_CMD_POLL)
and atomically executes the following sequence:

	sigset_t origmask;

	pthread_sigmask(SIG_SETMASK, &sigmask, &origmask);
	ret = io_getevents(ctx, min_nr, nr, events, timeout);
	pthread_sigmask(SIG_SETMASK, &origmask, NULL);

Note that unlike many other signal related calls we do not pass a sigmask
size, as that would get us to 7 arguments, which aren't easily supported
by the syscall infrastructure.  It seems a lot less painful to just add a
new syscall variant in the unlikely case we're going to increase the
sigset size.

Do we have a manpage for this new syscall and maybe a test program for
it so we can exercise it as part of the kselftests?

And do we really need a compat thunk for a new syscall?  Ugh, I guess
it's needed due to the long mess, right?  No way to just define it the
same way for both arch sizes?

Anyway, the code seems sane to me:

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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