Messages in this thread Patch in this message |  | | | From | Lai Jiangshan <> | | Subject | [PATCH 4/7] highmem: remove pool_lock | | Date | Wed, 6 Jun 2012 16:14:58 +0800 |
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The accesses to the pool are always in kmap_lock critical region, thus pool_lock is not needed.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> --- 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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