linux-kernel - Re: [PATCH 28 of 66] _GFP_NO

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Date:	Mon, 29 Nov 2010 20:03:13 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 28 of 66] _GFP_NO_KSWAPD

On Thu, Nov 18, 2010 at 01:18:39PM +0000, Mel Gorman wrote:
> This is not an exact merge with what's currently in mm. Look at the top
> of gfp.h and see "Plain integer GFP bitmasks. Do not use this
> directly.". The 0x400000u definition needs to go there and this becomes
> 
> #define __GFP_NO_KSWAPD		((__force_gfp_t)____0x400000u)
> 
> What you have just generates sparse warnings (I believe) so it's
> harmless.

Agreed.

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -34,6 +34,7 @@ struct vm_area_struct;
 #else
 #define ___GFP_NOTRACK		0
 #endif
+#define ___GFP_NO_KSWAPD	0x400000u
 
 /*
  * GFP bitmasks..
@@ -81,7 +82,7 @@ struct vm_area_struct;
 #define __GFP_RECLAIMABLE ((__force gfp_t)___GFP_RECLAIMABLE) /* Page is reclaimable */
 #define __GFP_NOTRACK	((__force gfp_t)___GFP_NOTRACK)  /* Don't track with kmemcheck */
 
-#define __GFP_NO_KSWAPD	((__force gfp_t)0x400000u)
+#define __GFP_NO_KSWAPD	((__force gfp_t)___GFP_NO_KSWAPD)
 
 /*
  * This may seem redundant, but it's a way of annotating false positives vs.


> Other than needing to define ____GFP_NO_KSWAPD

3 underscores.

> Acked-by: Mel Gorman <mel@....ul.ie>

Added, thanks!
Andrea
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