From 0dc952dc3e6d96d554a19fa7bee3f3b1d55e3cff Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Mon, 5 Mar 2007 00:30:33 -0800 Subject: [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 Signed-off-by: Lee Schermerhorn Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/migrate.h | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'include') diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 48148e0cdbd..75e55dcdeb1 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); -- cgit v1.2.3