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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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