[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <497587B6.9010306@in.ibm.com>
Date: Tue, 20 Jan 2009 13:43:42 +0530
From: Chandru <chandru@...ibm.com>
To: Dave Hansen <dave@...ux.vnet.ibm.com>
CC: linuxppc-dev@...abs.org, Andrew Morton <akpm@...ux-foundation.org>,
Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.28-rc9 panics with crashkernel=256M while booting
Chandru wrote:
> In case either physbase or reserve_size are not page aligned and in addition
> if the following condition is also true
>
> node_ar.end_pfn = node->node_end_pfn = PFN_DOWN(physbase+reserve_size).
>
> we may hit the BUG_ON(end > bdata->node_low_pfn) in mark_bootmem_node() in
> mm/bootmem.c Hence pass the pfn that the physbase is part of and align
> reserve_size before calling reserve_bootmem_node().
>
> Signed-off-by: Chandru S <chandru@...ux.vnet.ibm.com>
> Cc: Dave Hansen <dave@...ux.vnet.ibm.com>
> ---
> arch/powerpc/mm/numa.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> --- linux-2.6.29-rc2/arch/powerpc/mm/numa.c.orig 2009-01-19 16:14:49.000000000 +0530
> +++ linux-2.6.29-rc2/arch/powerpc/mm/numa.c 2009-01-19 16:36:38.000000000 +0530
> @@ -901,7 +901,8 @@ static void mark_reserved_regions_for_ni
> get_node_active_region(start_pfn, &node_ar);
> while (start_pfn < end_pfn &&
> node_ar.start_pfn < node_ar.end_pfn) {
> - unsigned long reserve_size = size;
> + unsigned long reserve_size = (size >> PAGE_SHIFT) <<
> + PAGE_SHIFT;
> /*
> * if reserved region extends past active region
> * then trim size to active region
> @@ -917,7 +918,8 @@ static void mark_reserved_regions_for_ni
> dbg("reserve_bootmem %lx %lx nid=%d\n",
> physbase, reserve_size, node_ar.nid);
> reserve_bootmem_node(NODE_DATA(node_ar.nid),
> - physbase, reserve_size,
> + (start_pfn << PAGE_SHIFT),
> + reserve_size,
> BOOTMEM_DEFAULT);
> }
> /*
>
does this patch look good ?, do you concur with it ?
thanks,
Chandru
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists