diff options
Diffstat (limited to 'include/linux/highmem.h')
-rw-r--r-- | include/linux/highmem.h | 51 |
1 files changed, 49 insertions, 2 deletions
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 98e2cce..12c5e4e 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -73,10 +73,27 @@ static inline void clear_user_highpage(struct page *page, unsigned long vaddr) } #ifndef __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE +/** + * __alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA with caller-specified movable GFP flags + * @movableflags: The GFP flags related to the pages future ability to move like __GFP_MOVABLE + * @vma: The VMA the page is to be allocated for + * @vaddr: The virtual address the page will be inserted into + * + * This function will allocate a page for a VMA but the caller is expected + * to specify via movableflags whether the page will be movable in the + * future or not + * + * An architecture may override this function by defining + * __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE and providing their own + * implementation. + */ static inline struct page * -alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr) +__alloc_zeroed_user_highpage(gfp_t movableflags, + struct vm_area_struct *vma, + unsigned long vaddr) { - struct page *page = alloc_page_vma(GFP_HIGHUSER, vma, vaddr); + struct page *page = alloc_page_vma(GFP_HIGHUSER | movableflags, + vma, vaddr); if (page) clear_user_highpage(page, vaddr); @@ -85,6 +102,36 @@ alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr) } #endif +/** + * alloc_zeroed_user_highpage - Allocate a zeroed HIGHMEM page for a VMA + * @vma: The VMA the page is to be allocated for + * @vaddr: The virtual address the page will be inserted into + * + * This function will allocate a page for a VMA that the caller knows will + * not be able to move in the future using move_pages() or reclaim. If it + * is known that the page can move, use alloc_zeroed_user_highpage_movable + */ +static inline struct page * +alloc_zeroed_user_highpage(struct vm_area_struct *vma, unsigned long vaddr) +{ + return __alloc_zeroed_user_highpage(0, vma, vaddr); +} + +/** + * alloc_zeroed_user_highpage_movable - Allocate a zeroed HIGHMEM page for a VMA that the caller knows can move + * @vma: The VMA the page is to be allocated for + * @vaddr: The virtual address the page will be inserted into + * + * This function will allocate a page for a VMA that the caller knows will + * be able to migrate in the future using move_pages() or reclaimed + */ +static inline struct page * +alloc_zeroed_user_highpage_movable(struct vm_area_struct *vma, + unsigned long vaddr) +{ + return __alloc_zeroed_user_highpage(__GFP_MOVABLE, vma, vaddr); +} + static inline void clear_highpage(struct page *page) { void *kaddr = kmap_atomic(page, KM_USER0); |