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: v4.1.12-92~18^2^2~170
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=dd8d1a97d16f7cb6894a47018f0c517cb993e099;p=users%2Fjedix%2Flinux-maple.git

dax: Use copy_from_iter_nocache

Orabug: 22913653

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>
(cherry picked from commit 872eb127e3a6cddcfca1410bb808d9b9bc773dc1)
Signed-off-by: Dan Duval <dan.duval@oracle.com>
---

diff --git a/fs/dax.c b/fs/dax.c
index 99b5fbc38992..eaa9e0683227 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