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    Subject[PATCH v5 11/12] dax: fix S_DAX definition
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    Make sure S_DAX is defined in the CONFIG_FS_DAX=n + CONFIG_DEV_DAX=y
    case. Otherwise vma_is_dax() may incorrectly return false in the
    Device-DAX case.

    Cc: Alexander Viro <viro@zeniv.linux.org.uk>
    Cc: linux-fsdevel@vger.kernel.org
    Cc: Christoph Hellwig <hch@lst.de>
    Cc: <stable@vger.kernel.org>
    Fixes: dee410792419 ("/dev/dax, core: file operations and dax-mmap")
    Reviewed-by: Jan Kara <jack@suse.cz>
    Signed-off-by: Dan Williams <dan.j.williams@intel.com>
    ---
    include/linux/fs.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/include/linux/fs.h b/include/linux/fs.h
    index b2b2e15d227b..1242511b1c46 100644
    --- a/include/linux/fs.h
    +++ b/include/linux/fs.h
    @@ -1859,7 +1859,7 @@ struct super_operations {
    #define S_IMA 1024 /* Inode has an associated IMA struct */
    #define S_AUTOMOUNT 2048 /* Automount/referral quasi-directory */
    #define S_NOSEC 4096 /* no suid or xattr security attributes */
    -#ifdef CONFIG_FS_DAX
    +#if IS_ENABLED(CONFIG_FS_DAX) || IS_ENABLED(CONFIG_DEV_DAX)
    #define S_DAX 8192 /* Direct Access, avoiding the page cache */
    #else
    #define S_DAX 0 /* Make all the DAX code disappear */
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