From 0dc952dc3e6d96d554a19fa7bee3f3b1d55e3cff Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Mon, 5 Mar 2007 00:30:33 -0800 Subject: [PATCH] [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 ++++++++ mm/mempolicy.c | 9 --------- mm/migrate.c | 2 +- 3 files changed, 9 insertions(+), 10 deletions(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 48148e0cdbd1..75e55dcdeb18 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); diff --git a/mm/mempolicy.c b/mm/mempolicy.c index cf2a5381030a..d76e8eb342d0 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -321,15 +321,6 @@ static inline int check_pgd_range(struct vm_area_struct *vma, return 0; } -/* Check if a vma is migratable */ -static inline int vma_migratable(struct vm_area_struct *vma) -{ - if (vma->vm_flags & ( - VM_LOCKED|VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED)) - return 0; - return 1; -} - /* * Check if all pages in a range are on a set of nodes. * If pagelist != NULL then isolate pages from the LRU and diff --git a/mm/migrate.c b/mm/migrate.c index e9b161bde95b..7a66ca25dc8a 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -781,7 +781,7 @@ static int do_move_pages(struct mm_struct *mm, struct page_to_node *pm, err = -EFAULT; vma = find_vma(mm, pp->addr); - if (!vma) + if (!vma || !vma_migratable(vma)) goto set_status; page = follow_page(vma, pp->addr, FOLL_GET);