The patch titled
Subject: mm, highmem: remove useless pool_lock
has been removed from the -mm tree. Its filename was
mm-highmem-remove-useless-pool_lock.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Joonsoo Kim <js1304@xxxxxxxxx>
Subject: 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@xxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Reviewed-by: Minchan Kin <minchan@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/highmem.c | 6 ------
1 file changed, 6 deletions(-)
diff -puN mm/highmem.c~mm-highmem-remove-useless-pool_lock mm/highmem.c
--- a/mm/highmem.c~mm-highmem-remove-useless-pool_lock
+++ a/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,
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,
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) */
_
Patches currently in -mm which might be from js1304@xxxxxxxxx are
origin.patch
bootmem-remove-not-implemented-function-call-bootmem_arch_preferred_node.patch
bootmem-remove-alloc_arch_preferred_bootmem.patch
mm-warn_on_once-if-f_op-mmap-change-vmas-start-address.patch
linux-next.patch
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