linux-kernel - Re: [PATCH] smp_call_function

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Message-ID: <20100323213126.GA5594@kryten>
Date:	Wed, 24 Mar 2010 08:31:26 +1100
From:	Anton Blanchard <anton@...ba.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	Jens Axboe <jens.axboe@...cle.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	paulmck@...ux.vnet.ibm.com, Milton Miller <miltonm@....com>,
	Nick Piggin <npiggin@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] smp_call_function_many SMP race

 
Hi Peter,

> A rather simple question since my brain isn't quite ready processing the
> content here..

After working my way through that bug my brain wasn't in good shape
either because:

> Isn't reverting that one patch a simpler solution than adding all that
> extra logic? If not, then the above statement seems false and we had a
> bug even with that preempt_enable/disable() pair.

I screwed up the explanation :( The commit message that causes it is
54fdade1c3332391948ec43530c02c4794a38172 (generic-ipi: make struct
call_function_data lockless), and backing it out fixes the issue.

Anton
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