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-rw-r--r--mm/migrate.c36
1 files changed, 15 insertions, 21 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 9a0db5bbabe4..880bd592d38e 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1002,33 +1002,27 @@ static int do_pages_stat(struct mm_struct *mm, unsigned long nr_pages,
#define DO_PAGES_STAT_CHUNK_NR 16
const void __user *chunk_pages[DO_PAGES_STAT_CHUNK_NR];
int chunk_status[DO_PAGES_STAT_CHUNK_NR];
- unsigned long i, chunk_nr = DO_PAGES_STAT_CHUNK_NR;
- int err;
- for (i = 0; i < nr_pages; i += chunk_nr) {
- if (chunk_nr > nr_pages - i)
- chunk_nr = nr_pages - i;
+ while (nr_pages) {
+ unsigned long chunk_nr;
- err = copy_from_user(chunk_pages, &pages[i],
- chunk_nr * sizeof(*chunk_pages));
- if (err) {
- err = -EFAULT;
- goto out;
- }
+ chunk_nr = nr_pages;
+ if (chunk_nr > DO_PAGES_STAT_CHUNK_NR)
+ chunk_nr = DO_PAGES_STAT_CHUNK_NR;
+
+ if (copy_from_user(chunk_pages, pages, chunk_nr * sizeof(*chunk_pages)))
+ break;
do_pages_stat_array(mm, chunk_nr, chunk_pages, chunk_status);
- err = copy_to_user(&status[i], chunk_status,
- chunk_nr * sizeof(*chunk_status));
- if (err) {
- err = -EFAULT;
- goto out;
- }
- }
- err = 0;
+ if (copy_to_user(status, chunk_status, chunk_nr * sizeof(*status)))
+ break;
-out:
- return err;
+ pages += chunk_nr;
+ status += chunk_nr;
+ nr_pages -= chunk_nr;
+ }
+ return nr_pages ? -EFAULT : 0;
}
/*