linux-kernel - Re: [PATCH] make GFP_NOTRACK flag unconditional

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Message-ID: <alpine.DEB.2.00.1210152102220.5400@chino.kir.corp.google.com>
Date:	Mon, 15 Oct 2012 21:02:45 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Glauber Costa <glommer@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Christoph Lameter <cl@...ux.com>, Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] make GFP_NOTRACK flag unconditional

On Tue, 2 Oct 2012, David Rientjes wrote:

> > There was a general sentiment in a recent discussion (See
> > https://lkml.org/lkml/2012/9/18/258) that the __GFP flags should be
> > defined unconditionally. Currently, the only offender is GFP_NOTRACK,
> > which is conditional to KMEMCHECK.
> > 
> > This simple patch makes it unconditional.
> > 
> > Signed-off-by: Glauber Costa <glommer@...allels.com>
> > CC: Christoph Lameter <cl@...ux.com>
> > CC: Mel Gorman <mgorman@...e.de>
> > CC: Andrew Morton <akpm@...ux-foundation.org>
> 
> Acked-by: David Rientjes <rientjes@...gle.com>
> 
> I think it was done this way to show that if CONFIG_KMEMCHECK=n then the 
> bit could be reused for something else but I can't think of any reason why 
> that would be useful; what would need to add a gfp bit that would also 
> happen to depend on CONFIG_KMEMCHECK=n?  Nothing comes to mind to save a 
> bit.
> 
> There are other cases of this as well, like __GFP_OTHER_NODE which is only 
> useful for thp and it's defined unconditionally.  So this seems fine to 
> me.
> 

Still missing from linux-next as of this morning, I think this patch 
should be merged.
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