From: Jan Kara <jack@suse.cz>
Date: Thu, 12 May 2016 16:29:14 +0000 (+0200)
Subject: dax: Fix condition for filling of PMD holes
X-Git-Tag: v4.7-rc1~37^2~6
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b9953536c95fd0013695542bfa4694c7468673aa;p=karo-tx-linux.git

dax: Fix condition for filling of PMD holes

Currently dax_pmd_fault() decides to fill a PMD-sized hole only if
returned buffer has BH_Uptodate set. However that doesn't get set for
any mapping buffer so that branch is actually a dead code. The
BH_Uptodate check doesn't make any sense so just remove it.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
---

diff --git a/fs/dax.c b/fs/dax.c
index ea936b3d93dc..bdad05213e4b 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -788,7 +788,7 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
 
 	i_mmap_lock_read(mapping);
 
-	if (!write && !buffer_mapped(&bh) && buffer_uptodate(&bh)) {
+	if (!write && !buffer_mapped(&bh)) {
 		spinlock_t *ptl;
 		pmd_t entry;
 		struct page *zero_page = get_huge_zero_page();