[patch] mm, swap_cgroup: reschedule when neeed in swap_cgroup_swapoff()

[David Rientjes]

We got need_resched() warnings in swap_cgroup_swapoff() because
swap_cgroup_ctrl[type].length is particularly large.

Reschedule when needed.

Signed-off-by: David Rientjes <rient...@google.com>
---
 mm/swap_cgroup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c
--- a/mm/swap_cgroup.c
+++ b/mm/swap_cgroup.c
@@ -201,6 +201,8 @@ void swap_cgroup_swapoff(int type)
                        struct page *page = map[i];
                        if (page)
                                __free_page(page);
+                       if (!(i % SWAP_CLUSTER_MAX))
+                               cond_resched();
                }
                vfree(map);
        }