linux-kernel - [PATCH 40/91] powerpc: pseries: Fix kexec on machines with more than 4TB of RAM

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Date:	Sun, 05 Feb 2012 23:10:29 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Anton Blanchard <anton@...ba.org>,
	Michael Neuling <mikey@...ling.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Greg KH <gregkh@...uxfoundation.org>
Subject: [PATCH 40/91] powerpc: pseries: Fix kexec on machines with more than 4TB of RAM

2.6.27-longterm review patch.  If anyone has any objections, please let us know.

------------------

commit bed9a31527af8ff3dfbad62a1a42815cef4baab7 upstream.

On a box with 8TB of RAM the MMU hashtable is 64GB in size. That
means we have 4G PTEs. pSeries_lpar_hptab_clear was using a signed
int to store the index which will overflow at 2G.

Signed-off-by: Anton Blanchard <anton@...ba.org>
Acked-by: Michael Neuling <mikey@...ling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 arch/powerpc/platforms/pseries/lpar.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Index: longterm-2.6.27/arch/powerpc/platforms/pseries/lpar.c
===================================================================
--- longterm-2.6.27.orig/arch/powerpc/platforms/pseries/lpar.c	2012-02-05 22:34:33.813915314 +0100
+++ longterm-2.6.27/arch/powerpc/platforms/pseries/lpar.c	2012-02-05 22:34:40.526914898 +0100
@@ -371,7 +371,7 @@
 		unsigned long ptel;
 	} ptes[4];
 	long lpar_rc;
-	int i, j;
+	unsigned long i, j;
 
 	/* Read in batches of 4,
 	 * invalidate only valid entries not in the VRMA


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