vmap: remove needless lock and list in vmap

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>

1 files changed, 3 insertions, 16 deletions

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index af58324c361a..fab19876b4d1 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -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));