linux-kernel - Re: [PATCH 17 of 66] add pmd mangling generic functions

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Date:	Sat, 27 Nov 2010 07:24:37 +0900
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Mel Gorman <mel@....ul.ie>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 17 of 66] add pmd mangling generic functions

On Fri, Nov 26, 2010 at 2:35 AM, Andrea Arcangeli <aarcange@...hat.com> wrote:
> On Thu, Nov 18, 2010 at 09:32:36AM -0800, Linus Torvalds wrote:
>> I dunno. Those macros are _way_ too big and heavy to be macros or
>> inline functions. Why aren't pmdp_splitting_flush() etc just
>> functions?
>
> That's because ptep_clear_flush and everything else in that file named
> with ptep_* and doing expensive tlb flushes was a macro.

That may be, and you needn't necessarily clean up old use (although
that might be nice as a separate thing), but I wish we didn't make
what is already messy bigger and messier.

         Linus
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