[ARM PATCH] 1912/1: Wrong cache aliasing bit check

Patch from Catalin Marinas

arch/arm/mm/mmap.c: arch_get_unamapped_area() checks bit 9 in the cache type register for possible cache aliasing problems. Bit 11 should be checked instead.

diff --git a/arch/arm/mm/mmap.c b/arch/arm/mm/mmap.c
index eec9d7b00fbfc387b6c0013f5182c0c6bbfdfeeb..32c4b0e35b37768f7d75fa01194f1f9c3d0baac8 100644 (file)
--- a/arch/arm/mm/mmap.c
+++ b/arch/arm/mm/mmap.c
@@ -40,7 +40,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
         */
        cache_type = read_cpuid(CPUID_CACHETYPE);
        if (cache_type != read_cpuid(CPUID_ID)) {
-               aliasing = (cache_type | cache_type >> 12) & (1 << 9);
+               aliasing = (cache_type | cache_type >> 12) & (1 << 11);
                if (aliasing)
                        do_align = filp || flags & MAP_SHARED;
        }