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vmap: remove needless lock and list in vmap

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vmap's dirty_list is unused.  It's for optimizing flushing.  but Nick
didn't write the code yet.  so, we don't need it until time as it is
needed.

This patch removes vmap_block's dirty_list and codes related to it.

Signed-off-by: MinChan Kim <minchan.kim@gmail.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
MinChan Kim 2009-03-31 15:19:26 -07:00 committed by Linus Torvalds
parent ef161a9863
commit d086817dc0
1 changed files with 3 additions and 16 deletions
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19
mm/vmalloc.c
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@ -671,10 +671,7 @@ struct vmap_block {
DECLARE_BITMAP(alloc_map, VMAP_BBMAP_BITS);
DECLARE_BITMAP(dirty_map, VMAP_BBMAP_BITS);
union {
struct {
struct list_head free_list;
struct list_head dirty_list;
};
struct list_head free_list;
struct rcu_head rcu_head;
};
};
@ -741,7 +738,6 @@ static struct vmap_block *new_vmap_block(gfp_t gfp_mask)
bitmap_zero(vb->alloc_map, VMAP_BBMAP_BITS);
bitmap_zero(vb->dirty_map, VMAP_BBMAP_BITS);
INIT_LIST_HEAD(&vb->free_list);
INIT_LIST_HEAD(&vb->dirty_list);
vb_idx = addr_to_vb_idx(va->va_start);
spin_lock(&vmap_block_tree_lock);
@ -772,12 +768,7 @@ static void free_vmap_block(struct vmap_block *vb)
struct vmap_block *tmp;
unsigned long vb_idx;
spin_lock(&vb->vbq->lock);
if (!list_empty(&vb->free_list))
list_del(&vb->free_list);
if (!list_empty(&vb->dirty_list))
list_del(&vb->dirty_list);
spin_unlock(&vb->vbq->lock);
BUG_ON(!list_empty(&vb->free_list));
vb_idx = addr_to_vb_idx(vb->va->va_start);
spin_lock(&vmap_block_tree_lock);
@ -862,11 +853,7 @@ static void vb_free(const void *addr, unsigned long size)
spin_lock(&vb->lock);
bitmap_allocate_region(vb->dirty_map, offset >> PAGE_SHIFT, order);
if (!vb->dirty) {
spin_lock(&vb->vbq->lock);
list_add(&vb->dirty_list, &vb->vbq->dirty);
spin_unlock(&vb->vbq->lock);
}
vb->dirty += 1UL << order;
if (vb->dirty == VMAP_BBMAP_BITS) {
BUG_ON(vb->free || !list_empty(&vb->free_list));