linux-kernel - Re: 2.6.28-rc9 panics with crashkernel=256M while booting

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Date:	Mon, 19 Jan 2009 17:00:03 +0530
From:	Chandru <chandru@...ibm.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: 2.6.28-rc9 panics with crashkernel=256M while booting

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);
 			}
 			/*

--
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