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x86, pat: Fix cacheflush address in change_page_attr_set_clr() 

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>
Cc: Stable team <stable@kernel.org>
This commit is contained in:
Jack Steiner 2009-09-03 12:56:02 -05:00 committed by H. Peter Anvin
parent a269cca992
commit fa526d0d64
1 changed files with 7 additions and 1 deletions
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8
arch/x86/mm/pageattr.c
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@ -822,6 +822,7 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
{
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(unsigned long *addr, int numpages,
*/
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(unsigned long *addr, int numpages,
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);