From: Joonsoo Kim <js1304@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Joonsoo Kim <js1304@gmail.com>
Subject: [PATCH 2/5] mm, highmem: remove useless pool_lock
Date: Mon, 29 Oct 2012 04:12:53 +0900 [thread overview]
Message-ID: <1351451576-2611-3-git-send-email-js1304@gmail.com> (raw)
In-Reply-To: <1351451576-2611-1-git-send-email-js1304@gmail.com>
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>
diff --git a/mm/highmem.c b/mm/highmem.c
index b3b3d68..017bad1 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) */
--
1.7.9.5
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next prev parent reply other threads:[~2012-10-28 19:15 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Yes>
2012-07-16 16:14 ` [PATCH 1/3] mm: correct return value of migrate_pages() Joonsoo Kim
2012-07-16 16:14 ` [PATCH 2/3] mm: fix possible incorrect return value of migrate_pages() syscall Joonsoo Kim
2012-07-16 17:26 ` Christoph Lameter
2012-07-16 17:40 ` Michal Nazarewicz
2012-07-16 17:59 ` JoonSoo Kim
2012-07-17 13:02 ` Michal Nazarewicz
2012-07-16 16:14 ` [PATCH 3/3] mm: fix return value in __alloc_contig_migrate_range() Joonsoo Kim
2012-07-16 17:29 ` Christoph Lameter
2012-07-16 17:40 ` Michal Nazarewicz
2012-07-16 18:40 ` JoonSoo Kim
2012-07-17 13:16 ` Michal Nazarewicz
2012-07-16 17:14 ` [PATCH 4] mm: fix possible incorrect return value of move_pages() syscall Joonsoo Kim
2012-07-16 17:30 ` Christoph Lameter
2012-07-16 17:23 ` [PATCH 1/3] mm: correct return value of migrate_pages() Christoph Lameter
2012-07-16 17:32 ` JoonSoo Kim
2012-07-16 17:37 ` Christoph Lameter
2012-07-16 17:40 ` Michal Nazarewicz
2012-07-16 17:57 ` JoonSoo Kim
2012-07-16 18:05 ` Christoph Lameter
2012-07-17 12:33 ` [PATCH 1/4 v2] mm: correct return value of migrate_pages() and migrate_huge_pages() Joonsoo Kim
2012-07-17 12:33 ` [PATCH 2/4 v2] mm: fix possible incorrect return value of migrate_pages() syscall Joonsoo Kim
2012-07-17 14:28 ` Christoph Lameter
2012-07-17 15:41 ` JoonSoo Kim
2012-07-17 12:33 ` [PATCH 3/4 v2] mm: fix return value in __alloc_contig_migrate_range() Joonsoo Kim
2012-07-17 13:25 ` Michal Nazarewicz
2012-07-17 15:45 ` JoonSoo Kim
2012-07-17 15:49 ` [PATCH 3/4 v3] " Joonsoo Kim
2012-07-17 12:33 ` [PATCH 4/4 v2] mm: fix possible incorrect return value of move_pages() syscall Joonsoo Kim
2012-07-27 17:55 ` [RESEND PATCH 1/4 v3] mm: correct return value of migrate_pages() and migrate_huge_pages() Joonsoo Kim
2012-07-27 17:55 ` [RESEND PATCH 2/4 v3] mm: fix possible incorrect return value of migrate_pages() syscall Joonsoo Kim
2012-07-27 20:57 ` Christoph Lameter
2012-07-28 6:16 ` JoonSoo Kim
2012-07-30 19:30 ` Christoph Lameter
2012-07-27 17:55 ` [RESEND PATCH 3/4 v3] mm: fix return value in __alloc_contig_migrate_range() Joonsoo Kim
2012-07-27 17:55 ` [RESEND PATCH 4/4 v3] mm: fix possible incorrect return value of move_pages() syscall Joonsoo Kim
2012-07-27 20:54 ` Christoph Lameter
2012-07-28 6:09 ` JoonSoo Kim
2012-07-30 19:29 ` Christoph Lameter
2012-07-31 3:34 ` JoonSoo Kim
2012-07-31 14:04 ` Christoph Lameter
2012-08-01 5:15 ` Michael Kerrisk
2012-08-01 18:00 ` Christoph Lameter
2012-08-02 5:52 ` Michael Kerrisk
2012-08-24 16:05 ` [PATCH 1/2] slub: rename cpu_partial to max_cpu_object Joonsoo Kim
2012-08-24 16:05 ` [PATCH 2/2] slub: correct the calculation of the number of cpu objects in get_partial_node Joonsoo Kim
2012-08-24 16:15 ` Christoph Lameter
2012-08-24 16:28 ` JoonSoo Kim
2012-08-24 16:31 ` Christoph Lameter
2012-08-24 16:40 ` JoonSoo Kim
2012-08-24 16:12 ` [PATCH 1/2] slub: rename cpu_partial to max_cpu_object Christoph Lameter
2012-08-25 14:11 ` [PATCH 1/2] slab: do ClearSlabPfmemalloc() for all pages of slab Joonsoo Kim
2012-08-25 14:11 ` [PATCH 2/2] slab: fix starting index for finding another object Joonsoo Kim
2012-09-03 10:08 ` [PATCH 1/2] slab: do ClearSlabPfmemalloc() for all pages of slab Mel Gorman
2012-10-20 15:48 ` [PATCH for-v3.7 1/2] slub: optimize poorly inlined kmalloc* functions Joonsoo Kim
2012-10-20 15:48 ` [PATCH for-v3.7 2/2] slub: optimize kmalloc* inlining for GFP_DMA Joonsoo Kim
2012-10-22 14:31 ` Christoph Lameter
2012-10-23 2:29 ` JoonSoo Kim
2012-10-23 6:16 ` Eric Dumazet
2012-10-23 16:12 ` JoonSoo Kim
2012-10-24 8:05 ` [PATCH for-v3.7 1/2] slub: optimize poorly inlined kmalloc* functions Pekka Enberg
2012-10-24 13:36 ` Christoph Lameter
2012-10-28 19:12 ` [PATCH 0/5] minor clean-up and optimize highmem related code Joonsoo Kim
2012-10-28 19:12 ` [PATCH 1/5] mm, highmem: use PKMAP_NR() to calculate an index of pkmap Joonsoo Kim
2012-10-29 1:48 ` Minchan Kim
2012-10-28 19:12 ` Joonsoo Kim [this message]
2012-10-29 1:52 ` [PATCH 2/5] mm, highmem: remove useless pool_lock Minchan Kim
2012-10-30 21:31 ` Andrew Morton
2012-10-31 5:14 ` Minchan Kim
2012-10-31 15:01 ` JoonSoo Kim
2012-10-28 19:12 ` [PATCH 3/5] mm, highmem: remove page_address_pool list Joonsoo Kim
2012-10-29 1:57 ` Minchan Kim
2012-10-28 19:12 ` [PATCH 4/5] mm, highmem: makes flush_all_zero_pkmaps() return index of last flushed entry Joonsoo Kim
2012-10-29 2:06 ` Minchan Kim
2012-10-29 13:12 ` JoonSoo Kim
2012-10-28 19:12 ` [PATCH 5/5] mm, highmem: get virtual address of the page using PKMAP_ADDR() Joonsoo Kim
2012-10-29 2:09 ` Minchan Kim
2012-10-29 2:12 ` [PATCH 0/5] minor clean-up and optimize highmem related code Minchan Kim
2012-10-29 13:15 ` JoonSoo Kim
2012-10-31 17:11 ` JoonSoo Kim
2012-10-31 16:56 ` [PATCH v2 " Joonsoo Kim
2012-10-31 16:56 ` [PATCH v2 1/5] mm, highmem: use PKMAP_NR() to calculate an index of pkmap Joonsoo Kim
2012-10-31 16:56 ` [PATCH v2 2/5] mm, highmem: remove useless pool_lock Joonsoo Kim
2012-10-31 16:56 ` [PATCH v2 3/5] mm, highmem: remove page_address_pool list Joonsoo Kim
2012-10-31 16:56 ` [PATCH v2 4/5] mm, highmem: makes flush_all_zero_pkmaps() return index of first flushed entry Joonsoo Kim
2012-11-01 5:03 ` Minchan Kim
2012-11-02 19:07 ` JoonSoo Kim
2012-11-02 22:42 ` Minchan Kim
2012-11-13 0:30 ` JoonSoo Kim
2012-11-13 12:49 ` Minchan Kim
2012-11-13 14:12 ` JoonSoo Kim
2012-11-13 15:01 ` Minchan Kim
2012-11-14 17:09 ` JoonSoo Kim
2012-11-19 23:46 ` Minchan Kim
2012-11-27 15:01 ` JoonSoo Kim
2012-10-31 16:56 ` [PATCH v2 5/5] mm, highmem: get virtual address of the page using PKMAP_ADDR() Joonsoo Kim
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