From: Mikulas Patocka mpatocka@redhat.com
commit d35bd764e6899a7bea71958f08d16cea5bfa1919 upstream.
Add cond_resched() to a loop that fills in the mapper memory area because the loop can be executed many times.
Fixes: 48debafe4f2fe ("dm: add writecache target") Cc: stable@vger.kernel.org Signed-off-by: Mikulas Patocka mpatocka@redhat.com Signed-off-by: Mike Snitzer snitzer@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/dm-writecache.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c index 509552fc55fc7..cc028353f9d55 100644 --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -281,6 +281,8 @@ static int persistent_memory_claim(struct dm_writecache *wc) while (daa-- && i < p) { pages[i++] = pfn_t_to_page(pfn); pfn.val++; + if (!(i & 15)) + cond_resched(); } } while (i < p); wc->memory_map = vmap(pages, p, VM_MAP, PAGE_KERNEL);