linux-kernel - Re: [PATCH 00/12] cpumask: reduce stack pressure from local/passed cpumask variables v2

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Message-ID: <47EA7177.8010605@sgi.com>
Date:	Wed, 26 Mar 2008 08:53:27 -0700
From:	Mike Travis <travis@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/12] cpumask: reduce stack pressure from local/passed
 cpumask variables v2

Ingo Molnar wrote:
> * Mike Travis <travis@....com> wrote:
> 
>> Modify usage of cpumask_t variables to use pointers as much as 
>> possible.
> 
> hm, why is there no minimal patch against -git that does nothing but 
> introduces the new pointer based generic APIs (without using them) - 
> such as set_cpus_allowed_ptr(), etc.? Once that is upstream all the 
> remaining changes can trickle one arch and one subsystem at a time, and 
> once that's done, the old set_cpus_allowed() can be removed. This is far 
> more manageable than one large patch.
> 
> and the cpumask_of_cpu() change should be Kconfig based initially - once 
> all arches have moved to it (or even sooner) we can remove that.
> 
> 	Ingo

Yes, good idea!  I'll see about dividing them up.  Though 99% seems to
be in generic kernel code (kernel/sched.c is by far the biggest user.)

There is one function pointer in a struct that would need an additional entry
if we keep both interfaces.

Thanks,
Mike
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