releases/2.6.31.1/x86-pat-fix-cacheflush-address-in-change_page_attr_set_clr.patch

From fa526d0d641b5365676a1fb821ce359e217c9b85 Mon Sep 17 00:00:00 2001
From: Jack Steiner <steiner@sgi.com>
Date: Thu, 3 Sep 2009 12:56:02 -0500
Subject: x86, pat: Fix cacheflush address in change_page_attr_set_clr()

From: Jack Steiner <steiner@sgi.com>

commit fa526d0d641b5365676a1fb821ce359e217c9b85 upstream.

Fix address passed to cpa_flush_range() when changing page
attributes from WB to UC. The address (*addr) is
modified by __change_page_attr_set_clr(). The result is that
the pages being flushed start at the _end_ of the changed range
instead of the beginning.

This should be considered for 2.6.30-stable and 2.6.31-stable.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 arch/x86/mm/pageattr.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -822,6 +822,7 @@ static int change_page_attr_set_clr(unsi
 {
 	struct cpa_data cpa;
 	int ret, cache, checkalias;
+	unsigned long baddr = 0;
 
 	/*
 	 * Check, if we are requested to change a not supported
@@ -853,6 +854,11 @@ static int change_page_attr_set_clr(unsi
 			 */
 			WARN_ON_ONCE(1);
 		}
+		/*
+		 * Save address for cache flush. *addr is modified in the call
+		 * to __change_page_attr_set_clr() below.
+		 */
+		baddr = *addr;
 	}
 
 	/* Must avoid aliasing mappings in the highmem code */
@@ -900,7 +906,7 @@ static int change_page_attr_set_clr(unsi
 			cpa_flush_array(addr, numpages, cache,
 					cpa.flags, pages);
 		} else
-			cpa_flush_range(*addr, numpages, cache);
+			cpa_flush_range(baddr, numpages, cache);
 	} else
 		cpa_flush_all(cache);