diff options
Diffstat (limited to 'mm/highmem.c')
| -rw-r--r-- | mm/highmem.c | 30 |
1 files changed, 5 insertions, 25 deletions
diff --git a/mm/highmem.c b/mm/highmem.c index 2da13a5c50e2..b32b70cdaed6 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -99,12 +99,13 @@ 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; + int i = PKMAP_NR(addr); return pte_page(pkmap_page_table[i]); } return virt_to_page(addr); } +EXPORT_SYMBOL(kmap_to_page); static void flush_all_zero_pkmaps(void) { @@ -137,8 +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; @@ -324,11 +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 @@ -393,14 +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; @@ -413,9 +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; } } @@ -425,20 +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) */ |