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 Signed-off-by: Suresh Siddha --- 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 1224865..38dc61f 100644 --- a/arch/x86/mm/pageattr.c +++ b/arch/x86/mm/pageattr.c @@ -1007,15 +1007,19 @@ 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]); @@ -1028,8 +1032,7 @@ 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); -- 1.6.0.6 -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/