We can find free page_address_map instance without the page_address_pool.
So remove it.
Signed-off-by: Joonsoo Kim <js1...@gmail.com>
diff --git a/mm/highmem.c b/mm/highmem.c
index 017bad1..731cf9a 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -323,11 +323,7 @@ struct page_address_map {
void *virtual;
struct list_head list;
};
-
-/*
- * page_address_map freelist, allocated from page_address_maps.
- */
-static struct list_head page_address_pool; /* freelist */
+static struct page_address_map page_address_maps[LAST_PKMAP];
/*
* Hash table bucket
@@ -392,12 +388,7 @@ void set_page_address(struct page *page, void *virtual)
pas = page_slot(page);
if (virtual) { /* Add */
- BUG_ON(list_empty(&page_address_pool));
-
- pam = list_entry(page_address_pool.next,
- struct page_address_map, list);
- list_del(&pam->list);
-
+ pam = &page_address_maps[PKMAP_NR((unsigned long)virtual)];
pam->page = page;
pam->virtual = virtual;
@@ -410,7 +401,6 @@ void set_page_address(struct page *page, void *virtual)
if (pam->page == page) {
list_del(&pam->list);
spin_unlock_irqrestore(&pas->lock, flags);
- list_add_tail(&pam->list, &page_address_pool);
goto done;
}
}
@@ -420,15 +410,10 @@ done:
return;
}
-static struct page_address_map page_address_maps[LAST_PKMAP];
-
void __init page_address_init(void)
{
int i;
- INIT_LIST_HEAD(&page_address_pool);
- for (i = 0; i < ARRAY_SIZE(page_address_maps); i++)
- list_add(&page_address_maps[i].list, &page_address_pool);
for (i = 0; i < ARRAY_SIZE(page_address_htable); i++) {
INIT_LIST_HEAD(&page_address_htable[i].lh);
spin_lock_init(&page_address_htable[i].lock);
--
1.7.9.5
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