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Commit 90036ee5 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
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[PATCH] page migration: Fail with error if swap not setup 



Currently the migration of anonymous pages will silently fail if no swap is
setup.  This patch makes page migration functions check for available swap
and fail with -ENODEV if no swap space is available.

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent e0e8eb54

mm/mempolicy.c

+12 −2
Original line number Diff line number Diff line
@@ -330,9 +330,19 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end, 
	int err;

	struct vm_area_struct *first, *vma, *prev;



	/* Clear the LRU lists so pages can be isolated */

	if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))

	if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) {

		/* Must have swap device for migration */

		if (nr_swap_pages <= 0)

			return ERR_PTR(-ENODEV);



		/*

		 * Clear the LRU lists so pages can be isolated.

		 * Note that pages may be moved off the LRU after we have

		 * drained them. Those pages will fail to migrate like other

		 * pages that may be busy.

		 */

		lru_add_drain_all();

	}



	first = find_vma(mm, start);

	if (!first)