linux-kernel - Re: mm: convert vma->vm

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Message-Id: <20110413091301.41E1.A69D9226@jp.fujitsu.com>
Date:	Wed, 13 Apr 2011 09:13:03 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Paul Mundt <lethal@...ux-sh.org>,
	Russell King <linux@....linux.org.uk>
Subject: Re: mm: convert vma->vm_flags to 64bit

> On Tue, 2011-04-12 at 14:06 +0300, Alexey Dobriyan wrote:
> > On Tue, Apr 12, 2011 at 10:12 AM, KOSAKI Motohiro
> > <kosaki.motohiro@...fujitsu.com> wrote:
> > > After next year? All developers don't have to ignore compiler warnings!
> > 
> > At least add vm_flags_t which is sparse-checked, just like we do with gfp_t.
> > 
> > VM_SAO is ppc64 only, so it could be moved into high part,
> > freeing 1 bit?
> 
> My original series did use a type, I don't know what that was dropped,
> it made conversion easier imho.

Yes, I take Hugh's version because vm_flags_t is ugly to me. And arch 
dependent variable size is problematic. Because Almost all driver developers
only test their code on x86. Also, I don't want to add hidden ifdef into mm
code.

Thanks.


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