linux-kernel - Re: [PATCH v5 1/8] smp: Introduce a generic on_each_cpu

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Message-ID: <CAOtvUMdk6DdcHK3Rp8ctwa8BqkF9YLwa09PHTUFCE53VdAY_6A@mail.gmail.com>
Date:	Tue, 3 Jan 2012 10:12:21 +0200
From:	Gilad Ben-Yossef <gilad@...yossef.com>
To:	Michal Nazarewicz <mina86@...a86.com>
Cc:	linux-kernel@...r.kernel.org, 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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, Avi Kivity <avi@...hat.com>
Subject: Re: [PATCH v5 1/8] smp: Introduce a generic on_each_cpu_mask function

2012/1/3 Michal Nazarewicz <mina86@...a86.com>:
> On Mon, 02 Jan 2012 11:24:12 +0100, Gilad Ben-Yossef <gilad@...yossef.com>
> wrote:
>>
>> @@ -102,6 +102,13 @@ static inline void call_function_init(void) { }
>>  int on_each_cpu(smp_call_func_t func, void *info, int wait);
>> /*
>> + * Call a function on processors specified by mask, which might include
>> + * the local one.
>> + */
>> +void on_each_cpu_mask(const struct cpumask *mask, void (*func)(void *),
>> +               void *info, bool wait);
>> +
>
>
> on_each_cpu() returns an int.  For consistency reasons, would it make sense
> to
> make on_each_cpu_maks() to return and int?  I know that the difference is
> that
> smp_call_function() returns and int and smp_call_function_many() returns
> void,
> but to me it actually seems strange and either I'm missing something
> important
> (which is likely) or this needs to get cleaned up at one point as well.
>

I'd say we should go the other way around - kill the return value on
on_each_cpu()

The return value is always a hard coded zero and we have some code that tests
for that return value. Silly...

It looks like it's there for hysterical reasons to me :-)

Gilad



-- 
Gilad Ben-Yossef
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gilad@...yossef.com
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"Unfortunately, cache misses are an equal opportunity pain provider."
-- Mike Galbraith, LKML
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