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authorNathan Fontenot <nfont@austin.ibm.com>2008-10-01 09:44:02 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-10-10 15:55:17 +1100
commit9fd3f88cb67ac51bd5face8441472b91e042be67 (patch)
tree4579e16f3d1f9504f8320ce973afc9996cd07e39
parent7c12d906f4ef690c65e60111375856640f63a545 (diff)
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>
-rw-r--r--arch/powerpc/platforms/pseries/hotplug-memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index a1a368dd2d9..140d02a5232 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -21,7 +21,7 @@ static int pseries_remove_lmb(unsigned long base, unsigned int lmb_size)
struct zone *zone;
int ret;
- start_pfn = base >> PFN_SECTION_SHIFT;
+ start_pfn = base >> PAGE_SHIFT;
zone = page_zone(pfn_to_page(start_pfn));
/*