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authorvenkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com>2009-04-09 14:26:48 -0700
committerIngo Molnar <mingo@elte.hu>2009-04-10 13:55:46 +0200
commita5593e0b329a14dea41ea173380dbf1533de2bd2 (patch)
treeaa488fcab5e4327192a052f576b15db839124408 /arch/x86/mm
parent43a432b1559798d33970261f710030f787770231 (diff)
x86, PAT: Change order of cpa and free in set_memory_wb
To be free of aliasing due to races, set_memory_* interfaces should follow ordering of reserving, changing memtype to UC/WC, changing memtype back to WB followed by free. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> LKML-Reference: <20090409212708.512280000@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/pageattr.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index d71e1b636ce..d487eaa17bf 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1021,15 +1021,19 @@ int _set_memory_wb(unsigned long addr, int numpages)
int set_memory_wb(unsigned long addr, int numpages)
{
+ int ret = _set_memory_wb(addr, numpages);
free_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE);
-
- return _set_memory_wb(addr, numpages);
+ return ret;
}
EXPORT_SYMBOL(set_memory_wb);
int set_memory_array_wb(unsigned long *addr, int addrinarray)
{
int i;
+ int ret;
+
+ ret = change_page_attr_clear(addr, addrinarray,
+ __pgprot(_PAGE_CACHE_MASK), 1);
for (i = 0; i < addrinarray; i++) {
unsigned long start = __pa(addr[i]);
@@ -1042,8 +1046,7 @@ int set_memory_array_wb(unsigned long *addr, int addrinarray)
}
free_memtype(start, end);
}
- return change_page_attr_clear(addr, addrinarray,
- __pgprot(_PAGE_CACHE_MASK), 1);
+ return ret;
}
EXPORT_SYMBOL(set_memory_array_wb);