linux-kernel - [PATCH 3/3] mm, vmalloc: Remove alloc_map from vmap

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Date:	Fri, 07 Jun 2013 17:55:10 +0800
From:	Zhang Yanfei <zhangyanfei@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	chanho.min@....com, Johannes Weiner <hannes@...xchg.org>,
	iamjoonsoo.kim@....com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>, Mel Gorman <mgorman@...e.de>
Subject: [PATCH 3/3] mm, vmalloc: Remove alloc_map from vmap_block

As we have removed the dead code in the vb_alloc, it seems there is
no place to use the alloc_map. So there is no reason to maintain
the alloc_map in vmap_block.

Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
 mm/vmalloc.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 5c037b9..ad11d4f 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -754,7 +754,6 @@ struct vmap_block {
 	struct vmap_area *va;
 	struct vmap_block_queue *vbq;
 	unsigned long free, dirty;
-	DECLARE_BITMAP(alloc_map, VMAP_BBMAP_BITS);
 	DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS);
 	struct list_head free_list;
 	struct rcu_head rcu_head;
@@ -820,7 +819,6 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
 	vb->va = va;
 	vb->free = VMAP_BBMAP_BITS;
 	vb->dirty = 0;
-	bitmap_zero(vb->alloc_map, VMAP_BBMAP_BITS);
 	bitmap_zero(vb->dirty_map, VMAP_BBMAP_BITS);
 	INIT_LIST_HEAD(&vb->free_list);
 
@@ -873,7 +871,6 @@ static void purge_fragmented_blocks(int cpu)
 		if (vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS) {
 			vb->free = 0; /* prevent further allocs after releasing lock */
 			vb->dirty = VMAP_BBMAP_BITS; /* prevent purging it again */
-			bitmap_fill(vb->alloc_map, VMAP_BBMAP_BITS);
 			bitmap_fill(vb->dirty_map, VMAP_BBMAP_BITS);
 			spin_lock(&vbq->lock);
 			list_del_rcu(&vb->free_list);
-- 
1.7.1

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