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authorChristoph Lameter <clameter@engr.sgi.com>2007-03-05 00:30:33 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-05 07:57:51 -0800
commit0dc952dc3e6d96d554a19fa7bee3f3b1d55e3cff (patch)
tree1dcf2ff93784716143b7acef816888a71a9504c2 /include
parent1f2b69f9bdce8461341e5fb864568a2ee90079c8 (diff)
downloadop-kernel-dev-0dc952dc3e6d96d554a19fa7bee3f3b1d55e3cff.zip
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[PATCH] Page migration: Fix vma flag checking
Currently we do not check for vma flags if sys_move_pages is called to move individual pages. If sys_migrate_pages is called to move pages then we check for vm_flags that indicate a non migratable vma but that still includes VM_LOCKED and we can migrate mlocked pages. Extract the vma_migratable check from mm/mempolicy.c, fix it and put it into migrate.h so that is can be used from both locations. Problem was spotted by Lee Schermerhorn Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/migrate.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 48148e0..75e55dc 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -5,6 +5,14 @@
typedef struct page *new_page_t(struct page *, unsigned long private, int **);
+/* Check if a vma is migratable */
+static inline int vma_migratable(struct vm_area_struct *vma)
+{
+ if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
+ return 0;
+ return 1;
+}
+
#ifdef CONFIG_MIGRATION
extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
extern int putback_lru_pages(struct list_head *l);
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