mm: memcg: remove optimization of keeping the root_mem_cgroup LRU lists empty

[~andy/linux] / mm / fadvise.c

diff --git a/mm/fadvise.c b/mm/fadvise.c
index 8d723c9e8b75b316041ea564f5e243b79a94e2b7..469491e0af79fed994d48fd4ada817f8e50c6d6a 100644 (file)
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -117,7 +117,8 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
                break;
        case POSIX_FADV_DONTNEED:
                if (!bdi_write_congested(mapping->backing_dev_info))
-                       filemap_flush(mapping);
+                       __filemap_fdatawrite_range(mapping, offset, endbyte,
+                                                  WB_SYNC_NONE);
 
                /* First and last FULL page! */
                start_index = (offset+(PAGE_CACHE_SIZE-1)) >> PAGE_CACHE_SHIFT;