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 <[EMAIL PROTECTED]>
---
Index: linux-2.6-paulus/arch/powerpc/platforms/pseries/hotplug-memory.c
===================================================================
--- linux-2.6-paulus.orig/arch/powerpc/platforms/pseries/hotplug-memory.c
2008-08-25 13:08:27.000000000 -0500
+++ linux-2.6-paulus/arch/powerpc/platforms/pseries/hotplug-memory.c
2008-10-01 14:20:08.000000000 -0500
@@ -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));
/*
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