linux-kernel - Re: [PATCH] x86: Add optimized popcnt variants

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Message-ID: <4B88097E.7010608@zytor.com>
Date:	Fri, 26 Feb 2010 09:48:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...64.org>
CC:	Michal Marek <mmarek@...e.cz>,
	linux-kbuild <linux-kbuild@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jamie Lokier <jamie@...reable.org>,
	Roland Dreier <rdreier@...co.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Brian Gerst <brgerst@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] x86: Add optimized popcnt variants

On 02/25/2010 11:47 PM, Borislav Petkov wrote:
> From: "H. Peter Anvin" <hpa@...or.com>
> Date: Thu, Feb 25, 2010 at 09:27:25PM -0800
> 
>> OK, this patch looks pretty good now, but I'm completely lost as to
>> what the baseline of this patch is supposed to be.
> 
> Yeah, this is based on PeterZ's http://lkml.org/lkml/2010/2/4/119
> 
> But I'm not sure which tree has it...
> 

Looks like -mm, which really means that either Andrew has to take your
patch, too, or we have to wait until that is upstream until we can merge
your patch.

I'm a little nervous about just acking the patch and telling Andrew to
test it, because I don't know what the fallout would look like.  I'm
particularly concerned about gcc version dependencies.

I guess, on the other hand, if it ends up not getting merged until .35
it's not a huge deal either.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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