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authorJoonsoo Kim <js1304@gmail.com>2012-12-11 16:01:20 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-11 17:22:24 -0800
commitcc33a303f1c155cf0147964586bb80fa732d8a21 (patch)
tree823c1707b3d527c6bf0190a81aa6ed732c3bfc5c
parent4de22c0584fb0566487b2cba5cdfbce346b18402 (diff)
mm, highmem: remove useless pool_lock
The pool_lock protects the page_address_pool from concurrent access. But, access to the page_address_pool is already protected by kmap_lock. So remove it. Signed-off-by: Joonsoo Kim <js1304@gmail.com> Cc: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Minchan Kin <minchan@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/highmem.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/mm/highmem.c b/mm/highmem.c
index 2576a7118981..f0f0f1d5e691 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -328,7 +328,6 @@ struct page_address_map {
* page_address_map freelist, allocated from page_address_maps.
*/
static struct list_head page_address_pool; /* freelist */
-static spinlock_t pool_lock; /* protects page_address_pool */
/*
* Hash table bucket
@@ -395,11 +394,9 @@ void set_page_address(struct page *page, void *virtual)
if (virtual) { /* Add */
BUG_ON(list_empty(&page_address_pool));
- spin_lock_irqsave(&pool_lock, flags);
pam = list_entry(page_address_pool.next,
struct page_address_map, list);
list_del(&pam->list);
- spin_unlock_irqrestore(&pool_lock, flags);
pam->page = page;
pam->virtual = virtual;
@@ -413,9 +410,7 @@ void set_page_address(struct page *page, void *virtual)
if (pam->page == page) {
list_del(&pam->list);
spin_unlock_irqrestore(&pas->lock, flags);
- spin_lock_irqsave(&pool_lock, flags);
list_add_tail(&pam->list, &page_address_pool);
- spin_unlock_irqrestore(&pool_lock, flags);
goto done;
}
}
@@ -438,7 +433,6 @@ void __init page_address_init(void)
INIT_LIST_HEAD(&page_address_htable[i].lh);
spin_lock_init(&page_address_htable[i].lock);
}
- spin_lock_init(&pool_lock);
}
#endif /* defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) */