linux-kernel - Re: [v7 1/8] smp: introduce a generic on_each_cpu

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Message-ID: <CAOtvUMef-8p8WVL1uZEuMTOyiM+HTUDPjexw4jhL=0-xodta5w@mail.gmail.com>
Date:	Tue, 31 Jan 2012 08:33:03 +0200
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Chris Metcalf <cmetcalf@...era.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Russell King <linux@....linux.org.uk>, linux-mm@...ck.org,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, Rik van Riel <riel@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Sasha Levin <levinsasha928@...il.com>,
	Mel Gorman <mel@....ul.ie>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Kosaki Motohiro <kosaki.motohiro@...il.com>,
	Milton Miller <miltonm@....com>, linux-kernel@...r.kernel.org
Subject: Re: [v7 1/8] smp: introduce a generic on_each_cpu_mask function

On Mon, Jan 30, 2012 at 11:52 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Sun, 29 Jan 2012 14:24:16 +0200
> Gilad Ben-Yossef <gilad@...yossef.com> wrote:
>
>> On Thu, Jan 26, 2012 at 12:01 PM, Gilad Ben-Yossef <gilad@...yossef.com> wrote:
>> > on_each_cpu_mask calls a function on processors specified by
>> > cpumask, which may or may not include the local processor.
>> >
>> > You must not call this function with disabled interrupts or
>> > from a hardware interrupt handler or from a bottom half handler.
>> >
>> > Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
>> > Reviewed-by: Christoph Lameter <cl@...ux.com>
>> > CC: Chris Metcalf <cmetcalf@...era.com>
>> ...
>> > ---
>> > __include/linux/smp.h | __ 22 ++++++++++++++++++++++
>> > __kernel/smp.c __ __ __ __| __ 29 +++++++++++++++++++++++++++++
>> > __2 files changed, 51 insertions(+), 0 deletions(-)
>> >
>>
>>
>> Milton made the very sensible comment that while adding on_each_cpu() in the
>> arch generic code and removing the two arch specific instances from tile and arm
>> in separate patches is good for review, it will break bisect.
>>
>> He suggested I squash  them into a single commit when it goes in.
>>
>> Since you picked the patch set into linux-mm, will now be a good time for that?
>
> I can fold the patches together - I do that all the time.
>
> Please identify exactly whcih patches you're referring to here.
>
> arm-move-arm-over-to-generic-on_each_cpu_mask and
> tile-move-tile-to-use-generic-on_each_cpu_mask should be folded into
> smp-introduce-a-generic-on_each_cpu_mask-function, yes?

Yes. Thank you.

Gilad

-- 
Gilad Ben-Yossef
Chief Coffee Drinker
gilad@...yossef.com
Israel Cell: +972-52-8260388
US Cell: +1-973-8260388
http://benyossef.com

"Unfortunately, cache misses are an equal opportunity pain provider."
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