linux-kernel - [PATCH] - Fix kernel_physical_mapping

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Message-ID: <20080716161159.GA23870@sgi.com>
Date:	Wed, 16 Jul 2008 11:11:59 -0500
From:	Jack Steiner <steiner@....com>
To:	mingo@...e.hu, tglx@...utronix.de
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] - Fix kernel_physical_mapping_init() for large x86 systems 

Fix bug in kernel_physical_mapping_init() that causes kernel
page table to be built incorrectly for systems with greater
than 512GB of memory.

Signed-off-by: Jack Steiner <steiner@....com>

---
 arch/x86/mm/init_64.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/arch/x86/mm/init_64.c
===================================================================
--- linux.orig/arch/x86/mm/init_64.c	2008-07-15 16:43:49.000000000 -0500
+++ linux/arch/x86/mm/init_64.c	2008-07-16 11:00:25.000000000 -0500
@@ -644,7 +644,7 @@ static unsigned long __init kernel_physi
 		unsigned long pud_phys;
 		pud_t *pud;
 
-		next = start + PGDIR_SIZE;
+		next = (start + PGDIR_SIZE) & PGDIR_MASK;
 		if (next > end)
 			next = end;
 
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