linux-kernel - [PATCH rc5-mm1 3/3] do_try_to_free_pages gfp

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Date:	Tue, 11 Mar 2008 21:16:04 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Mel Gorman <mel@....ul.ie>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH rc5-mm1 3/3] do_try_to_free_pages gfp_mask redundant

do_try_to_free_pages is taking both a gfp_mask and an sc->gfp_mask,
sometimes one used and sometimes the other; at present they're always
identical, but such duplication begs for trouble: remove gfp_mask arg.

Signed-off-by: Hugh Dickins <hugh@...itas.com>
---

 mm/vmscan.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- 2.6.25-rc5-mm1++/mm/vmscan.c	2008-03-11 20:15:47.000000000 +0000
+++ linux/mm/vmscan.c	2008-03-11 20:21:14.000000000 +0000
@@ -1324,7 +1324,7 @@ static unsigned long shrink_zones(int pr
  * allocation attempt will fail.
  */
 static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
-					gfp_t gfp_mask, struct scan_control *sc)
+					struct scan_control *sc)
 {
 	int priority;
 	int ret = 0;
@@ -1334,7 +1334,7 @@ static unsigned long do_try_to_free_page
 	unsigned long lru_pages = 0;
 	struct zoneref *z;
 	struct zone *zone;
-	enum zone_type high_zoneidx = gfp_zone(gfp_mask);
+	enum zone_type high_zoneidx = gfp_zone(sc->gfp_mask);
 
 	if (scan_global_lru(sc))
 		count_vm_event(ALLOCSTALL);
@@ -1363,7 +1363,7 @@ static unsigned long do_try_to_free_page
 		 * over limit cgroups
 		 */
 		if (scan_global_lru(sc)) {
-			shrink_slab(sc->nr_scanned, gfp_mask, lru_pages);
+			shrink_slab(sc->nr_scanned, sc->gfp_mask, lru_pages);
 			if (reclaim_state) {
 				nr_reclaimed += reclaim_state->reclaimed_slab;
 				reclaim_state->reclaimed_slab = 0;
@@ -1435,7 +1435,7 @@ unsigned long try_to_free_pages(struct z
 		.isolate_pages = isolate_pages_global,
 	};
 
-	return do_try_to_free_pages(zonelist, gfp_mask, &sc);
+	return do_try_to_free_pages(zonelist, &sc);
 }
 
 #ifdef CONFIG_CGROUP_MEM_RES_CTLR
@@ -1457,7 +1457,7 @@ unsigned long try_to_free_mem_cgroup_pag
 	sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) |
 			(GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK);
 	zonelist = NODE_DATA(numa_node_id())->node_zonelists;
-	return do_try_to_free_pages(zonelist, sc.gfp_mask, &sc);
+	return do_try_to_free_pages(zonelist, &sc);
 }
 #endif
 
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