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    Subject[PATCH v3 5/6] dax: short circuit vma_is_fsdax() in the CONFIG_FS_DAX=n case
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    Do not bother looking up the file type in the case when Filesystem-DAX
    is disabled at build time.

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

    diff --git a/include/linux/fs.h b/include/linux/fs.h
    index 7418341578a3..c97fc4dbaae1 100644
    --- a/include/linux/fs.h
    +++ b/include/linux/fs.h
    @@ -3197,6 +3197,8 @@ 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);
    \
     
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