src/patches/suse-2.6.27.31/patches.arch/ppc-pseries_remove_lmb-PAGE_SHIFTT.patch

   1 Subject: Bug 431380 – UPT-LTE: mem dlpar remove generates oops(.pseries_remove_lmb+0x28/0xb8)
   2 From: Nathan Fontenot <nfont@austin.ibm.com>
   3 References: 431380 - LTC48430
   4
   5
   6 Testing hotplug memory remove has revealed that we can oops in
   7 pseries_lmb_remove().  The incorrect shift causes a NULL pointer
   8 dereference in the page_zone() inline routine.
   9
  10 I have only been able to reproduce the oops on kernels with large pages
  11 enabled.
  12
  13 Tested on Power5 and Power6 with and without large pages enabled.
  14
  15
  16 Signed-off-by: Olaf Hering <olh@suse.de>
  17
  18 ---
  19  arch/powerpc/platforms/pseries/hotplug-memory.c |    2 +-
  20  1 file changed, 1 insertion(+), 1 deletion(-)
  21
  22 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c
  23 +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
  24 @@ -21,7 +21,7 @@ static int pseries_remove_lmb(unsigned l
  25         struct zone *zone;
  26         int ret;
  27
  28 -       start_pfn = base >> PFN_SECTION_SHIFT;
  29 +       start_pfn = base >> PAGE_SHIFT;
  30         zone = page_zone(pfn_to_page(start_pfn));
  31
  32         /*