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SubjectRe: 2.6.28-rc9 panics with crashkernel=256M while booting
Date
On Wednesday 07 January 2009 22:55:25 Dave Hansen wrote:
>
> I'm just suggesting making your fix in the ppc code instead of in
> mm/bootmem.c.
>

Here are the changes that helped to boot the kernel. Please review it.
Thanks,

Signed-off-by: Chandru S <chandru@linux.vnet.ibm.com>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
---
arch/powerpc/mm/numa.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- linux-2.6.28/arch/powerpc/mm/numa.c.orig 2009-01-08 03:20:41.000000000 -0600
+++ linux-2.6.28/arch/powerpc/mm/numa.c 2009-01-08 03:50:41.000000000 -0600
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/nodemask.h>
#include <linux/cpu.h>
+#include <linux/pfn.h>
#include <linux/notifier.h>
#include <linux/lmb.h>
#include <linux/of.h>
@@ -898,9 +899,17 @@ static void mark_reserved_regions_for_ni
* if reserved region extends past active region
* then trim size to active region
*/
- if (end_pfn > node_ar.end_pfn)
+ if (end_pfn > node_ar.end_pfn) {
reserve_size = (node_ar.end_pfn << PAGE_SHIFT)
- (start_pfn << PAGE_SHIFT);
+ /*
+ * resize it further if the reservation could
+ * cross the last page in this node
+ */
+ if (PFN_UP(physbase+reserve_size) >
+ node_end_pfn)
+ reserve_size -= PAGE_SIZE;
+ }
/*
* Only worry about *this* node, others may not
* yet have valid NODE_DATA().

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