linux-kernel - Re: [PATCH 4/4] posix-timers: turn it_signal into it

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Message-ID: <20110904202907.GA3404@redhat.com>
Date:	Sun, 4 Sep 2011 22:29:07 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	eric.dumazet@...il.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 4/4] posix-timers: turn it_signal into it_valid flag

On 09/04, Oleg Nesterov wrote:
>
> Although I
> feel this all can be simplified even more.

And perhaps we need some fixes?

I forgot everything I knew about ->it_requeue_pending logic, but it
seems to me that do_schedule_next_timer()->lock_timer() can find and
lock successfully the wrong timer. Another thread can do timer_delete()
and then re-create the timer with the same id.

Oleg.

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