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Diffstat (limited to 'mm/highmem.c')
-rw-r--r--mm/highmem.c31
1 files changed, 5 insertions, 26 deletions
diff --git a/mm/highmem.c b/mm/highmem.c
index 2a07f97dabf1..b32b70cdaed6 100644
--- a/mm/highmem.c
+++ b/mm/highmem.c
@@ -98,8 +98,8 @@ struct page *kmap_to_page(void *vaddr)
{
unsigned long addr = (unsigned long)vaddr;
- if (addr >= PKMAP_ADDR(0) && addr <= PKMAP_ADDR(LAST_PKMAP)) {
- int i = (addr - PKMAP_ADDR(0)) >> PAGE_SHIFT;
+ if (addr >= PKMAP_ADDR(0) && addr < PKMAP_ADDR(LAST_PKMAP)) {
+ int i = PKMAP_NR(addr);
return pte_page(pkmap_page_table[i]);
}
@@ -138,8 +138,7 @@ static void flush_all_zero_pkmaps(void)
* So no dangers, even with speculative execution.
*/
page = pte_page(pkmap_page_table[i]);
- pte_clear(&init_mm, (unsigned long)page_address(page),
- &pkmap_page_table[i]);
+ pte_clear(&init_mm, PKMAP_ADDR(i), &pkmap_page_table[i]);
set_page_address(page, NULL);
need_flush = 1;
@@ -325,11 +324,7 @@ struct page_address_map {
struct list_head list;
};
-/*
- * 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 */
+static struct page_address_map page_address_maps[LAST_PKMAP];
/*
* Hash table bucket
@@ -394,14 +389,7 @@ void set_page_address(struct page *page, void *virtual)
pas = page_slot(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_address_maps[PKMAP_NR((unsigned long)virtual)];
pam->page = page;
pam->virtual = virtual;
@@ -414,9 +402,6 @@ 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;
}
}
@@ -426,20 +411,14 @@ 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);
}
- spin_lock_init(&pool_lock);
}
#endif /* defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) */