提交 cc33a303 编写于 作者: J Joonsoo Kim 提交者: Linus Torvalds

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: NJoonsoo Kim <js1304@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: NMinchan Kin <minchan@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 4de22c05
......@@ -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) */
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