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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: mm: convert vma->vm_flags to 64bit
In-Reply-To: <BANLkTinLdWB+ON=TY=KHyzsrC8gC5bXg7Q@mail.gmail.com>
References: <20110412161315.B518.A69D9226@jp.fujitsu.com> <BANLkTinLdWB+ON=TY=KHyzsrC8gC5bXg7Q@mail.gmail.com>
Message-Id: <20110413084047.41DD.A69D9226@jp.fujitsu.com>
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Date: Wed, 13 Apr 2011 08:41:02 +0900 (JST)
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To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: kosaki.motohiro@jp.fujitsu.com, Andrew Morton <akpm@linux-foundation.org>, LKML <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Hugh Dickins <hughd@google.com>, Dave Hansen <dave@linux.vnet.ibm.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Paul Mundt <lethal@linux-sh.org>, Russell King <linux@arm.linux.org.uk>

> On Tue, Apr 12, 2011 at 10:12 AM, KOSAKI Motohiro
> <kosaki.motohiro@jp.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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