tree 691f6aca919e9a53777be7cbffeb3b87c694c314
parent 742b06b5628f2cd23cb51a034cb54dc33c6162c5
author Liu Xiang <liu.xiang6@zte.com.cn> 1554652467 -0400
committer Theodore Ts'o <tytso@mit.edu> 1554652467 -0400

ext4: fix prefetchw of NULL page

In ext4_mpage_readpages(), if the parameter pages is not NULL, another
parameter page is NULL. At the first time prefetchw(&page->flags)
works on NULL. From second time, prefetchw(&page->flags) always works on
the last consumed page. This might do little improvment for handling
current page. So prefetchw() should be called while the page pointer
has just been updated.

Signed-off-by: Liu Xiang <liu.xiang6@zte.com.cn>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>