Messages in this thread Patch in this message | | | From | Joonsoo Kim <> | Subject | [PATCH 2/3] mm: fix possible incorrect return value of migrate_pages() syscall | Date | Tue, 17 Jul 2012 01:14:31 +0900 |
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do_migrate_pages() can return the number of pages not migrated. Because migrate_pages() syscall return this value directly, migrate_pages() syscall may return the number of pages not migrated. In fail case in migrate_pages() syscall, we should return error value. So change err to -EIO
Additionally, Correct comment above do_migrate_pages()
Signed-off-by: Joonsoo Kim <js1304@gmail.com> Cc: Sasha Levin <levinsasha928@gmail.com> Cc: Christoph Lameter <cl@linux.com>
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 1d771e4..f7df271 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -948,7 +948,7 @@ static int migrate_to_node(struct mm_struct *mm, int source, int dest, * Move pages between the two nodesets so as to preserve the physical * layout as much as possible. * - * Returns the number of page that could not be moved. + * Returns error or the number of pages not migrated. */ int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, const nodemask_t *to, int flags) @@ -1382,6 +1382,8 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, err = do_migrate_pages(mm, old, new, capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); + if (err > 0) + err = -EIO; mmput(mm); out: -- 1.7.9.5
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