linux-kernel - [PATCH 2/3] dax: short circuit vma_is_fsdax() in the CONFIG_FS

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Message-ID: <151778552571.7139.13956395885168306089.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Sun, 04 Feb 2018 15:05:25 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     alex.williamson@...hat.com
Cc:     jack@...e.cz, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, hch@....de
Subject: [PATCH 2/3] dax: short circuit vma_is_fsdax() in the
 CONFIG_FS_DAX=n case

Do not bother looking up the file type in the case when Filesystem-DAX
is disabled at build time.

Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org
Cc: Christoph Hellwig <hch@....de>
Cc: Jan Kara <jack@...e.cz>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 include/linux/fs.h |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index a3329258ff5c..31aeb0b86d85 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3201,6 +3201,8 @@ static inline bool vma_is_fsdax(struct vm_area_struct *vma)
 
 	if (!vma->vm_file)
 		return false;
+	if (!IS_ENABLED(CONFIG_FS_DAX))
+		return false;
 	if (!vma_is_dax(vma))
 		return false;
 	inode = file_inode(vma->vm_file);