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

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Message-Id: <20110413084047.41DD.A69D9226@jp.fujitsu.com>
Date:	Wed, 13 Apr 2011 08:41:02 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.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, 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.

Good idea.

> VM_SAO is ppc64 only, so it could be moved into high part,
> freeing 1 bit?

Sure. But It have to be done after two kernel release cycle or so on.
I mean I'm afraid anyone add new vm_flags usage concurrently.



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