Re: [PATCH v4 09/12] mm, dax: replace IS_DAX() with IS_DEVDAX() or IS_FSDAX()

In preparation for fixing the broken definition of S_DAX in the CONFIG_FS_DAX=n + CONFIG_DEV_DAX=y case, convert all IS_DAX() usages to use explicit tests for the DEVDAX and FSDAX sub-cases of DAX functionality. Cc: Jan Kara <jack(a)suse.com&gt; Cc: Matthew Wilcox <mawilcox(a)microsoft.com&gt; Cc: Ross Zwisler <ross.zwisler(a)linux.intel.com&gt; Cc: <stable(a)vger.kernel.org&gt; Fixes: dee410792419 ("/dev/dax, core: file operations and dax-mmap") Signed-off-by: Dan Williams <dan.j.williams(a)intel.com&gt;

@@ -3208,21 +3208,19 @@ static inline bool io_is_direct(struct file *filp) static inline bool vma_is_dax(struct vm_area_struct *vma) { - return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); + struct inode *inode; + + if (!vma->vm_file) + return false; + inode = vma->vm_file->f_mapping->host;