linux-kernel - Re: safety of *mutex_unlock() (Was: [BUG] signal: sighand unprotected when accessed by /proc)

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Date:	Wed, 18 Jun 2014 12:53:07 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Clark Williams <williams@...hat.com>
Subject: Re: safety of *mutex_unlock() (Was: [BUG] signal: sighand
 unprotected when accessed by /proc)

On Wed, 18 Jun 2014 18:43:59 +0200
Oleg Nesterov <oleg@...hat.com> wrote:

 
> And (contrary to what I said initially) we can rely on this because -rt
> converts spinlock_t into rt_mutex ?

Correct. Because if spinlock_t has this behavior, rt_mutex must have it
too, otherwise -rt will suffer greatly from that. Who knows, maybe this
will fix some strange bug reports that we have had in the past.

-- Steve
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