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Commit b136be5e authored by Joonsoo Kim's avatar Joonsoo Kim Committed by Linus Torvalds
Browse files

mm, vmalloc: use well-defined find_last_bit() func 



Our intention in here is to find last_bit within the region to flush.
There is well-defined function, find_last_bit() for this purpose and its
performance may be slightly better than current implementation.  So change
it.

Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: default avatarWanpeng Li <liwanp@linux.vnet.ibm.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarZhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6b70f7df

mm/vmalloc.c

+6 −9
Original line number Diff line number Diff line
@@ -1016,15 +1016,16 @@ void vm_unmap_aliases(void) 


		rcu_read_lock();

		list_for_each_entry_rcu(vb, &vbq->free, free_list) {

			int i;

			int i, j;



			spin_lock(&vb->lock);

			i = find_first_bit(vb->dirty_map, VMAP_BBMAP_BITS);

			while (i < VMAP_BBMAP_BITS) {

			if (i < VMAP_BBMAP_BITS) {

				unsigned long s, e;

				int j;

				j = find_next_zero_bit(vb->dirty_map,

					VMAP_BBMAP_BITS, i);



				j = find_last_bit(vb->dirty_map,

							VMAP_BBMAP_BITS);

				j = j + 1; /* need exclusive index */



				s = vb->va->va_start + (i << PAGE_SHIFT);

				e = vb->va->va_start + (j << PAGE_SHIFT);
@@ -1034,10 +1035,6 @@ void vm_unmap_aliases(void) 
					start = s;

				if (e > end)

					end = e;



				i = j;

				i = find_next_bit(vb->dirty_map,

							VMAP_BBMAP_BITS, i);

			}

			spin_unlock(&vb->lock);

		}