linux-kernel - [PATCH v2 25/25] mm: Align THP mappings for non-DAX

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Date:   Tue, 11 Feb 2020 20:18:45 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Cc:     William Kucharski <william.kucharski@...cle.com>,
        linux-kernel@...r.kernel.org, Matthew Wilcox <willy@...radead.org>
Subject: [PATCH v2 25/25] 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 | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index b52e007f0856..b8d9e0d76062 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -577,13 +577,10 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr,
 	unsigned long ret;
 	loff_t off = (loff_t)pgoff << PAGE_SHIFT;
 
-	if (!IS_DAX(filp->f_mapping->host) || !IS_ENABLED(CONFIG_FS_DAX_PMD))
-		goto out;
-
 	ret = __thp_get_unmapped_area(filp, addr, len, off, flags, PMD_SIZE);
 	if (ret)
 		return ret;
-out:
+
 	return current->mm->get_unmapped_area(filp, addr, len, pgoff, flags);
 }
 EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
-- 
2.25.0