Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

[safe/jmp/linux-2.6] / mm / swapfile.c

diff --git a/mm/swapfile.c b/mm/swapfile.c
index ce5dda6..9c590ee 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1151,8 +1151,7 @@ static int try_to_unuse(unsigned int type)
                                } else
                                        retval = unuse_mm(mm, entry, page);
 
-                               if (set_start_mm &&
-                                   swap_count(*swap_map) < swcount) {
+                               if (set_start_mm && *swap_map < swcount) {
                                        mmput(new_start_mm);
                                        atomic_inc(&mm->mm_users);
                                        new_start_mm = mm;
@@ -1575,9 +1574,9 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
        p->flags &= ~SWP_WRITEOK;
        spin_unlock(&swap_lock);
 
-       current->flags |= PF_SWAPOFF;
+       current->flags |= PF_OOM_ORIGIN;
        err = try_to_unuse(type);
-       current->flags &= ~PF_SWAPOFF;
+       current->flags &= ~PF_OOM_ORIGIN;
 
        if (err) {
                /* re-insert swap space back into swap_list */
@@ -1974,12 +1973,14 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
                goto bad_swap;
        }
 
-       if (blk_queue_nonrot(bdev_get_queue(p->bdev))) {
-               p->flags |= SWP_SOLIDSTATE;
-               p->cluster_next = 1 + (random32() % p->highest_bit);
+       if (p->bdev) {
+               if (blk_queue_nonrot(bdev_get_queue(p->bdev))) {
+                       p->flags |= SWP_SOLIDSTATE;
+                       p->cluster_next = 1 + (random32() % p->highest_bit);
+               }
+               if (discard_swap(p) == 0)
+                       p->flags |= SWP_DISCARDABLE;
        }
-       if (discard_swap(p) == 0)
-               p->flags |= SWP_DISCARDABLE;
 
        mutex_lock(&swapon_mutex);
        spin_lock(&swap_lock);