diff options
| author | venkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com> | 2009-04-09 14:26:48 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-10 13:55:46 +0200 |
| commit | a5593e0b329a14dea41ea173380dbf1533de2bd2 (patch) | |
| tree | aa488fcab5e4327192a052f576b15db839124408 | |
| parent | 43a432b1559798d33970261f710030f787770231 (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>
| -rw-r--r-- | arch/x86/mm/pageattr.c | 11 |
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); |