linux-kernel - [PATCH 0/3] do_sigtimedwait() needs retarget_shared

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Message-ID: <20110423175901.GA484@redhat.com>
Date:	Sat, 23 Apr 2011 19:59:01 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Tejun Heo <tj@...nel.org>,
	"Nikita V. Youshchenko" <nyoushchenko@...sta.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 0/3] do_sigtimedwait() needs retarget_shared_pending()

On 04/18, Linus Torvalds wrote:
>
> In that case, this series looks fairly ok to me. I'm still unsure
> whether it's _required_,

Indeed! It is a bit annoying, I am not sure too. This "problem" is
very, very, old. And nobody complained so far. Except, this _might_
explain the hang reported by Nikita.

OTOH. Probably set_current_blocked() makes sense anyway, it would be
nice to require that nobody can play with ->blocked directly. We can
reconsider retarget_shared_pendind() or simply kill it if it adds the
noticeable overhead in practice.

So, I'll assume we need this changes. Correctness is always good. All
further changes should be simple and straightforward, I am going to
trim CC. Except sys_rt_sigtimedwait() is nasty, we need another helper
for simplicity.

If nobody objects, I'll send at lot of other "needs set_current_blocked"
simple patches to Andrew.

Oleg.

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