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

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Message-ID: <1268149840.5037.3.camel@laptop>
Date:	Tue, 09 Mar 2010 16:50:40 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <bp@...64.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	linux-kbuild <linux-kbuild@...r.kernel.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

On Tue, 2010-03-09 at 16:36 +0100, Borislav Petkov wrote:
> > On 02/27/2010 12:28 AM, Borislav Petkov wrote:
> > > 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.
> > > 
> > 
> > Yes, if we can get into -tip then we'll get more test coverage, so I'll
> > queue it up for .35 as soon as the merge window closes.  Please remind
> > me if I forget.
> 
> Hi Peter,
> 
> I see that you've added the HWEIGHT-capitalized interfaces for
> compile-time constants with fce877e3. Which means, the bits in
> <include/asm-generic/bitops/const_hweight.h> from your original patch at
> http://lkml.org/lkml/2010/2/4/119 need changing (or have changed already
> but I've missed them).
> 
> IOW, where can I get the current version of that last patch so that I can
> base my __arch_hweightXX stuff ontop of it for testing?

Should all be fine as it is, that patch
( http://lkml.org/lkml/2010/2/4/119 ) is against a kernel with fce877e3
in, I've just checked and it still applies to tip/master as of this
writing (although it grew a single 2 line offset for 1 hunk).



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