ARM: Fix wrong shared bit for CPU write buffer bug test
Russell King [Wed, 23 Dec 2009 19:54:31 +0000 (19:54 +0000)]
It is unpredictable to have the same memory mapped using different
shared bit settings for ARMv6 and ARMv7 CPUs.  Fix this for the CPU
write buffer bug test.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/fault-armv.c

index 7296022..56ee153 100644 (file)
@@ -207,9 +207,8 @@ void __init check_writebuffer_bugs(void)
        page = alloc_page(GFP_KERNEL);
        if (page) {
                unsigned long *p1, *p2;
-               pgprot_t prot = __pgprot(L_PTE_PRESENT|L_PTE_YOUNG|
-                                        L_PTE_DIRTY|L_PTE_WRITE|
-                                        L_PTE_MT_BUFFERABLE);
+               pgprot_t prot = __pgprot_modify(PAGE_KERNEL,
+                                       L_PTE_MT_MASK, L_PTE_MT_BUFFERABLE);
 
                p1 = vmap(&page, 1, VM_IOREMAP, prot);
                p2 = vmap(&page, 1, VM_IOREMAP, prot);