linux-kernel - Re: [PATCH 2/5] bitops: compile time optimization for hweight

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Message-ID: <20100204155419.GD32711@aftab>
Date:	Thu, 4 Feb 2010 16:54:19 +0100
From:	Borislav Petkov <bp@...64.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	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>
Subject: Re: [PATCH 2/5] bitops: compile time optimization for
 hweight_long(CONSTANT)

On Thu, Feb 04, 2010 at 04:13:52PM +0100, Peter Zijlstra wrote:
> hweight_long() isn't an arch primitive, only __arch_hweight{8,16,32,64}
> are.

Yeah, I'm still looking for the proper location. hweight_long() is the
generic version so do we want to do the

#ifndef __HAVE_ARCH_POPCNT
static inline unsigned long hweight_long(unsigned long w)
...

#endif

thing and define a x86-specific version?

-- 
Regards/Gruss,
Boris.

--
Advanced Micro Devices, Inc.
Operating Systems Research Center
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