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Commit 142762bd authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds
Browse files

mm: document follow_page() 



Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Izik Eidus <ieidus@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 58a9d3d8

mm/memory.c

+11 −2
Original line number Diff line number Diff line
@@ -1227,8 +1227,17 @@ int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, 
}

EXPORT_SYMBOL_GPL(zap_vma_ptes);



/*

 * Do a quick page-table lookup for a single page.

/**

 * follow_page - look up a page descriptor from a user-virtual address

 * @vma: vm_area_struct mapping @address

 * @address: virtual address to look up

 * @flags: flags modifying lookup behaviour

 *

 * @flags can have FOLL_ flags set, defined in <linux/mm.h>

 *

 * Returns the mapped (struct page *), %NULL if no mapping exists, or

 * an error pointer if there is a mapping to something not represented

 * by a page descriptor (see also vm_normal_page()).

 */

struct page *follow_page(struct vm_area_struct *vma, unsigned long address,

			unsigned int flags)