diff options
Diffstat (limited to 'mm/highmem.c')
| -rw-r--r-- | mm/highmem.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/mm/highmem.c b/mm/highmem.c index 35d47733cde..7da4a7b6af1 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -104,8 +104,9 @@ static void flush_all_zero_pkmaps(void) flush_tlb_kernel_range(PKMAP_ADDR(0), PKMAP_ADDR(LAST_PKMAP)); } -/* Flush all unused kmap mappings in order to remove stray - mappings. */ +/** + * kmap_flush_unused - flush all unused kmap mappings in order to remove stray mappings + */ void kmap_flush_unused(void) { spin_lock(&kmap_lock); @@ -163,6 +164,14 @@ start: return vaddr; } +/** + * kmap_high - map a highmem page into memory + * @page: &struct page to map + * + * Returns the page's virtual memory address. + * + * We cannot call this from interrupts, as it may block. + */ void *kmap_high(struct page *page) { unsigned long vaddr; @@ -170,8 +179,6 @@ void *kmap_high(struct page *page) /* * For highmem pages, we can't trust "virtual" until * after we have the lock. - * - * We cannot call this from interrupts, as it may block */ spin_lock(&kmap_lock); vaddr = (unsigned long)page_address(page); @@ -185,6 +192,10 @@ void *kmap_high(struct page *page) EXPORT_SYMBOL(kmap_high); +/** + * kunmap_high - map a highmem page into memory + * @page: &struct page to unmap + */ void kunmap_high(struct page *page) { unsigned long vaddr; @@ -259,6 +270,12 @@ static struct page_address_slot *page_slot(struct page *page) return &page_address_htable[hash_ptr(page, PA_HASH_ORDER)]; } +/** + * page_address - get the mapped virtual address of a page + * @page: &struct page to get the virtual address of + * + * Returns the page's virtual address. + */ void *page_address(struct page *page) { unsigned long flags; @@ -288,6 +305,11 @@ done: EXPORT_SYMBOL(page_address); +/** + * set_page_address - set a page's virtual address + * @page: &struct page to set + * @virtual: virtual address to use + */ void set_page_address(struct page *page, void *virtual) { unsigned long flags; |