powerpc: Oops in pseries_lmb_remove()
Testing hotplug memory remove has revealed that we can oops in
pseries_lmb_remove(). The incorrect shift causes a NULL pointer
dereference in the page_zone() inline routine.
I have only been able to reproduce the oops on kernels with large pages
enabled.
Tested on Power5 and Power6 with and without large pages enabled.
Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index a1a368d..140d02a 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -21,7 +21,7 @@
struct zone *zone;
int ret;
- start_pfn = base >> PFN_SECTION_SHIFT;
+ start_pfn = base >> PAGE_SHIFT;
zone = page_zone(pfn_to_page(start_pfn));
/*