From: Matthew Wilcox <willy@linux.intel.com>
Date: Fri, 3 Jul 2015 14:40:39 +0000 (-0400)
Subject: dax: Use copy_from_iter_nocache
X-Git-Tag: v4.2-rc1~2^2~5
X-Git-Url: http://git.cascardo.eti.br/?a=commitdiff_plain;h=872eb127e3a6cddcfca1410bb808d9b9bc773dc1;p=cascardo%2Flinux.git

dax: Use copy_from_iter_nocache

When userspace does a write, there's no need for the written data to
pollute the CPU cache.  This matches the original XIP code.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/dax.c b/fs/dax.c
index 6f65f00e58ec..159f796afa85 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -155,7 +155,7 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter,
 		}
 
 		if (iov_iter_rw(iter) == WRITE)
-			len = copy_from_iter(addr, max - pos, iter);
+			len = copy_from_iter_nocache(addr, max - pos, iter);
 		else if (!hole)
 			len = copy_to_iter(addr, max - pos, iter);
 		else