linux-kernel - Re: [PATCH 01/31] bitops: add parity functions

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Date:	Mon, 28 Mar 2016 19:56:04 -0700
From:	Joe Perches <joe@...ches.com>
To:	Zeng Zhaoxiu <zhaoxiu.zeng@...il.com>,
	Sam Ravnborg <sam@...nborg.org>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Martin Kepplinger <martink@...teo.de>,
	Sasha Levin <sasha.levin@...cle.com>,
	Ingo Molnar <mingo@...nel.org>,
	Yury Norov <yury.norov@...il.com>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 01/31] bitops: add parity functions

On Tue, 2016-03-29 at 10:27 +0800, Zeng Zhaoxiu wrote:
> 在 2016年03月28日 14:51, Sam Ravnborg 写道:
[]
> > Defining these as static inlines in asm-generic prevent an
> > architecture
> > from selecting between a more optimal asm version or the generic version
> > at run-time.
> > sparc would benefit from this as only some sparc chips supports popc.
> > See how this is done for hweight*
> > 
> > 	Sam
> Thanks. I will try.

You might also try to describe in any commit message
and perhaps the internal documentation why using gcc's
__builtin_parity isn't appropriate.