Commit 46c043ede4 ("mm: take i_mmap_lock in unmap_mapping_range() for
DAX") moved some code in __dax_pmd_fault() that was responsible for
zeroing newly allocated PMD pages. The new location didn't properly set
up 'kaddr', so when run this code resulted in a NULL pointer BUG.
Fix this by getting the correct 'kaddr' via bdev_direct_access().
Signed-off-by: Ross Zwisler <[email protected]>
Reported-by: Dan Williams <[email protected]>
Reviewed-by: Dan Williams <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Dave Chinner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>