linux-kernel - [PATCH 14/15] mm: Align THP mappings for non-DAX

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Date:   Tue, 24 Sep 2019 17:52:13 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     William Kucharski <william.kucharski@...cle.com>,
        Matthew Wilcox <willy@...radead.org>
Subject: [PATCH 14/15] mm: Align THP mappings for non-DAX

From: William Kucharski <william.kucharski@...cle.com>

When we have the opportunity to use transparent huge pages to map a
file, we want to follow the same rules as DAX.

Signed-off-by: William Kucharski <william.kucharski@...cle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 mm/huge_memory.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index cbe7d0619439..670a1780bd2f 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -563,8 +563,6 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
 
 	if (addr)
 		goto out;
-	if (!IS_DAX(filp->f_mapping->host) || !IS_ENABLED(CONFIG_FS_DAX_PMD))
-		goto out;
 
 	addr = __thp_get_unmapped_area(filp, len, off, flags, PMD_SIZE);
 	if (addr)
-- 
2.23.0