linux-kernel - Re: [PATCH 0/4 v3] smp_call_function

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Message-ID: <1300221569.2250.15.camel@laptop>
Date:	Tue, 15 Mar 2011 21:39:29 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Milton Miller <miltonm@....com>
Cc:	akpm@...ux-foundation.org, Anton Blanchard <anton@...ba.org>,
	xiaoguangrong@...fujitsu.com, mingo@...e.hu, jaxboe@...ionio.com,
	npiggin@...il.com, rusty@...tcorp.com.au, efault@....de,
	Jan Beulich <JBeulich@...ell.com>,
	Dimitri Sivanich <sivanich@....com>,
	Tony Luck <tony.luck@...el.com>, torvalds@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com, benh@...nel.crashing.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4 v3] smp_call_function_many issues from review

On Tue, 2011-03-15 at 13:27 -0600, Milton Miller wrote:
> Picking up this thread from the beginning of Feburary,  I updated
> the comments in 3 and 4 based on Paul's review.  I have inserted
> my proposed alternative to Paul's additional patch as patch 2,
> and tweaked the changelog on 1.
> 
> [PATCH 1/4 v3] call_function_many: fix list delete vs add race
> [PATCH 2/4 v3] call_function_many: add missing ordering
> [PATCH 3/4 v3] smp_call_function_many: handle concurrent clearing of mask
> [PATCH 4/4 v3] smp_call_function_interrupt: use typedef and %pf
> 
> Peter Z acked a prior version of patch 1, and Mike Galbraith has
> done some stress testing on the combinaton of 1,3,4, and Paul's patch.
> 
> The prior posting of this series is available here:
> https://patchwork.kernel.org/patch/522021/
> https://patchwork.kernel.org/patch/522031/
> http://marc.info/?l=linux-kernel&m=129654439817236&w=2
> 
> And Paul's additional patch from review was here
> https://patchwork.kernel.org/patch/525891/
> 
> Looking forward, I would suggest 1 and 2 are required for stable, 3 may
> be suitable as it fixes races that otherwise requires cpumask copies
> as in 75c1c91cb92806f960fcd6e53d2a0c21f343081c ([IA64] eliminate race
> condition in smp_flush_tlb_mm).  By contrast 4 is just comments except
> for the %pS to %pf change.

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Very interesting that patch #2.

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