linux-kernel - Re: [PATCH 2/2] Move FAULT_FLAG_xyz into handle_mm

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Date:	Fri, 10 Apr 2009 12:22:50 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ying Han <yinghan@...gle.com>
cc:	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Waychison <mikew@...gle.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Hugh Dickins <hugh@...itas.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"H. Peter Anvin" <hpa@...or.com>,
	Török Edwin <edwintorok@...il.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH 2/2] Move FAULT_FLAG_xyz into handle_mm_fault() callers

On Fri, 10 Apr 2009, Ying Han wrote:
> 
> How about something like this for x86? If it looks sane, i will apply
> to other arches.

Eventually yes, but only _after_ doing the "mindless patch".

I really want the patches that change calling conventions to "obviously" 
do nothing else (sure, they can still have bugs, but it minimizes the 
risk). Then, _after_ the calling convention has changed, you can do a 
separate "clean up" patch.

> +	unsigned int fault_flags |= FAULT_FLAG_RETRY;

I assume you meant "fault_flags = FAULT_FLAG_RETRY;", ie without the "|=".

But yes, other than that, this is the kind of patch that makes sense - 
having the callers eventually be converted to not use that "write" kind of 
boolean, but use the FAULT_FLAG_WRITE flags themselves directly, and then 
eventually have no "conversion" between the boolean and the fault_flag 
models at all.

			Linus
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