linux-kernel - [RFC][PATCHSET] wait4()/waitid() cleanups

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Date:   Mon, 15 May 2017 23:31:57 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     linux-kernel@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Oleg Nesterov <oleg@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Christoph Hellwig <hch@....de>
Subject: [RFC][PATCHSET] wait4()/waitid() cleanups

	This series switches compat wait4() and waitid() variants away
from set_fs() use.  A couple of helpers (kernel_wait4() and kernel_waitid())
are introduced, copying siginfo/rusage to userland is taken to sys_wait...().
That allows both to simplify the guts of do_wait() machinery and avoid
messing with set_fs() in compat variants of these syscalls.

	Lightly tested, seems to survive without regressions.  Please,
review.