1. 05 Oct, 2008 2 commits
  2. 04 Oct, 2008 16 commits
  3. 03 Oct, 2008 20 commits
  4. 02 Oct, 2008 2 commits
    • Andy Whitcroft's avatar
      mm: handle initialising compound pages at orders greater than MAX_ORDER · 6babc32c
      Andy Whitcroft authored
      When we initialise a compound page we initialise the page flags and head
      page pointer for all base pages spanned by that page.  When we initialise
      a gigantic page (a page of order greater than or equal to MAX_ORDER) we
      have to initialise more than MAX_ORDER_NR_PAGES pages.  Currently we
      assume that all elements of the mem_map in this page are contigious in
      memory.  However this is only guarenteed out to MAX_ORDER_NR_PAGES pages,
      and with SPARSEMEM enabled they will not be contigious.  This leads us to
      walk off the end of the first section and scribble on everything which
      follows, BAD.
      
      When we reach a MAX_ORDER_NR_PAGES boundary we much locate the next
      section of the mem_map.  As gigantic pages can only be maximally aligned
      we know this will occur at exact multiple of MAX_ORDER_NR_PAGES pages from
      the start of the page.
      
      This is a bug fix for the gigantic page support in hugetlbfs.
      
      Credit to Mel Gorman for spotting the issue.
      Signed-off-by: default avatarAndy Whitcroft <apw@shadowen.org>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Cc: Jon Tollefson <kniht@linux.vnet.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6babc32c
    • Nick Piggin's avatar
      mm: tiny-shmem nommu fix · 4b19de6d
      Nick Piggin authored
      The previous patch db203d53 ("mm:
      tiny-shmem fix lock ordering: mmap_sem vs i_mutex") to fix the lock
      ordering in tiny-shmem breaks shared anonymous and IPC memory on NOMMU
      architectures because it was using the expanding truncate to signal ramfs
      to allocate a physically contiguous RAM backing the inode (otherwise it is
      unusable for "memory mapping" it to userspace).
      
      However do_truncate is what caused the lock ordering error, due to it
      taking i_mutex.  In this case, we can actually just call ramfs directly to
      allocate memory for the mapping, rather than go via truncate.
      Acked-by: default avatarDavid Howells <dhowells@redhat.com>
      Acked-by: default avatarHugh Dickins <hugh@veritas.com>
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      Cc: Matt Mackall <mpm@selenic.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4b19de6d