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-rw-r--r--mm/memory.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/mm/memory.c b/mm/memory.c
index 833952d8b74d..119b7ccdf39b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1227,8 +1227,17 @@ int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
1227} 1227}
1228EXPORT_SYMBOL_GPL(zap_vma_ptes); 1228EXPORT_SYMBOL_GPL(zap_vma_ptes);
1229 1229
1230/* 1230/**
1231 * Do a quick page-table lookup for a single page. 1231 * follow_page - look up a page descriptor from a user-virtual address
1232 * @vma: vm_area_struct mapping @address
1233 * @address: virtual address to look up
1234 * @flags: flags modifying lookup behaviour
1235 *
1236 * @flags can have FOLL_ flags set, defined in <linux/mm.h>
1237 *
1238 * Returns the mapped (struct page *), %NULL if no mapping exists, or
1239 * an error pointer if there is a mapping to something not represented
1240 * by a page descriptor (see also vm_normal_page()).
1232 */ 1241 */
1233struct page *follow_page(struct vm_area_struct *vma, unsigned long address, 1242struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
1234 unsigned int flags) 1243 unsigned int flags)