Commit 7fa16c63 authored Jan 08, 2015 by Shiraz Hashim Committed by Gerrit - the friendly Code Review server Jan 21, 2015

mm: pagewalk: call pte_hole() for VM_PFNMAP during walk_page_range



walk_page_range silently skips vma having VM_PFNMAP set,
which leads to undesirable behaviour at client end (who
called walk_page_range). For example for pagemap_read,
when no callbacks are called against VM_PFNMAP vma,
pagemap_read may prepare pagemap data at wrong index.

Change-Id: I057b5c8ede1ae4bb9e3f8639e10bd4fcbf23da7e
Signed-off-by: Shiraz Hashim <shashim@codeaurora.org>

parent 9e9667a8

mm/pagewalk.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -199,7 +199,10 @@ int walk_page_range(unsigned long addr, unsigned long end,
		*/
		if ((vma->vm_start <= addr) &&
		(vma->vm_flags & VM_PFNMAP)) {
		next = vma->vm_end;
		if (walk->pte_hole)
		err = walk->pte_hole(addr, next, walk);
		if (err)
		break;
		pgd = pgd_offset(walk->mm, next);
		continue;
		}