linux-kernel - Re: [patch] mm: add comment about deprecation of __GFP

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Message-ID: <20100216072349.GI5723@laptop>
Date:	Tue, 16 Feb 2010 18:23:49 +1100
From:	Nick Piggin <npiggin@...e.de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Lubos Lunak <l.lunak@...e.cz>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch] mm: add comment about deprecation of __GFP_NOFAIL

On Mon, Feb 15, 2010 at 11:03:50PM -0800, David Rientjes wrote:
> On Tue, 16 Feb 2010, KAMEZAWA Hiroyuki wrote:
> 
> > I hope no 3rd vendor (proprietary) driver uses __GFP_NOFAIL, they tend to
> > believe API is trustable and unchanged.
> > 
> 
> I hope they don't use it with GFP_ATOMIC, either, because it's never been 
> respected in that context.  We can easily audit the handful of cases in 
> the kernel that use __GFP_NOFAIL (it takes five minutes at the max) and 
> prove that none use it with GFP_ATOMIC or GFP_NOFS.  We don't need to add 
> multitudes of warnings about using a deprecated flag with ludicrous 
> combinations (does anyone really expect GFP_ATOMIC | __GFP_NOFAIL to work 
> gracefully)?

You don't need to add warnings, just don't break existing working
combinations and nobody has anything to complain about.

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