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

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Message-ID: <alpine.DEB.2.00.1210022156450.8723@chino.kir.corp.google.com>
Date:	Tue, 2 Oct 2012 22:00:19 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Glauber Costa <glommer@...allels.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>, Mel Gorman <mgorman@...e.de>
Subject: Re: [PATCH] make GFP_NOTRACK flag unconditional

On Fri, 28 Sep 2012, Glauber Costa 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.
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