The accesses to the pool are always in kmap_lock critical region,
thus pool_lock is not needed.
Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
---
mm/highmem.c | 6 ------
1 files changed, 0 insertions(+), 6 deletions(-)
diff --git a/mm/highmem.c b/mm/highmem.c
index b6ce085..bf7f168 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -316,7 +316,6 @@ 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
@@ -383,11 +382,9 @@ static void set_high_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;
@@ -401,9 +398,7 @@ static void set_high_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;
}
}
@@ -426,7 +421,6 @@ 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) */
--
1.7.7
--
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