Gerd reports that ->i_mode may contain other bits besides S_IFCHR. Use
S_ISCHR() instead. Otherwise, get_user_pages_longterm() may fail on
device-dax instances when those are meant to be explicitly allowed.

Fixes: 2bb6d2837083 ("mm: introduce get_user_pages_longterm")
Cc: <sta...@vger.kernel.org>
Reported-by: Gerd Rausch <gerd.rau...@oracle.com>
Reported-by: Haozhong Zhang <haozhong.zh...@intel.com>
Signed-off-by: Dan Williams <dan.j.willi...@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 2a815560fda0..79c413985305 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3198,7 +3198,7 @@ static inline bool vma_is_fsdax(struct vm_area_struct 
*vma)
        if (!vma_is_dax(vma))
                return false;
        inode = file_inode(vma->vm_file);
-       if (inode->i_mode == S_IFCHR)
+       if (S_ISCHR(inode->i_mode))
                return false; /* device-dax */
        return true;
 }

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