• Hugh Dickins's avatar
    [PATCH] mm: mremap correct rmap accounting · 701dfbc1
    Hugh Dickins authored
    Nick Piggin points out that page accounting on MIPS multiple ZERO_PAGEs
    is not maintained by its move_pte, and could lead to freeing a ZERO_PAGE.
    
    Instead of complicating that move_pte, just forget the minor optimization
    when mremapping, and change the one thing which needed it for correctness
    - filemap_xip use ZERO_PAGE(0) throughout instead of according to address.
    
    [ "There is no block device driver one could use for XIP on mips
       platforms" - Carsten Otte ]
    Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
    Cc: Nick Piggin <nickpiggin@yahoo.com.au>
    Cc: Andrew Morton <akpm@osdl.org>
    Cc: Ralf Baechle <ralf@linux-mips.org>
    Cc: Carsten Otte <cotte@de.ibm.com>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    701dfbc1
filemap_xip.c 10.3 KB