Re: [PATCH v3 5/6] 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(a)zeniv.linux.org.uk&gt; Cc: linux-fsdevel(a)vger.kernel.org Cc: Christoph Hellwig <hch(a)lst.de&gt; Cc: Jan Kara <jack(a)suse.cz&gt; Signed-off-by: Dan Williams <dan.j.williams(a)intel.com&gt;

--- 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);