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

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Message-ID: <20100227082807.GA21706@aftab>
Date:	Sat, 27 Feb 2010 09:28:07 +0100
From:	Borislav Petkov <bp@...64.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Borislav Petkov <bp@...64.org>, 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>
Subject: Re: [PATCH] x86: Add optimized popcnt variants

From: "H. Peter Anvin" <hpa@...or.com>
Date: Fri, Feb 26, 2010 at 09:48:46AM -0800

> 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 have the same concern. Actually, I'll be much more at ease if it saw a
bit of wider testing without hitting mainline just yet. I'll try to give
it some more testing with the machines and toolchains I can get my hands
on next week.

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

Yeah, let's give it another round of testing and queue it for .35 -
AFAIR Ingo runs also a wide testing effort so it spending another cycle
in -tip and being hammered on by us could give us a bit more certainty.

Thanks.

-- 
Regards/Gruss,
Boris.

-
Advanced Micro Devices, Inc.
Operating Systems Research Center
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