linux-kernel - [patch]x86: arch_add_memory round up address

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Date:	Thu, 09 Oct 2008 13:31:30 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: [patch]x86: arch_add_memory round up address

Round up address to a page, otherwise the last page isn't mapped.

Signed-off-by: Shaohua Li <shaohua.li@...el.com>
---
 arch/x86/mm/init_64.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux/arch/x86/mm/init_64.c
===================================================================
--- linux.orig/arch/x86/mm/init_64.c	2008-10-09 11:42:33.000000000 +0800
+++ linux/arch/x86/mm/init_64.c	2008-10-09 11:43:22.000000000 +0800
@@ -721,7 +721,8 @@ int arch_add_memory(int nid, u64 start, 
 	unsigned long nr_pages = size >> PAGE_SHIFT;
 	int ret;
 
-	last_mapped_pfn = init_memory_mapping(start, start + size-1);
+	last_mapped_pfn = init_memory_mapping(start,
+		round_up(start + size-1, PAGE_SIZE));
 	if (last_mapped_pfn > max_pfn_mapped)
 		max_pfn_mapped = last_mapped_pfn;
 


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