1 files changed, 7 insertions, 0 deletions

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 02243eeccf50..ea67be0223ac 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -117,6 +117,13 @@ static void __init early_cachepolicy(char **p)
         }
         if (i == ARRAY_SIZE(cache_policies))
                 printk(KERN_ERR "ERROR: unknown or unsupported cache policy\n");
+        /*
+         * This restriction is partly to do with the way we boot; it is
+         * unpredictable to have memory mapped using two different sets of
+         * memory attributes (shared, type, and cache attribs).  We can not
+         * change these attributes once the initial assembly has setup the
+         * page tables.
+         */
         if (cpu_architecture() >= CPU_ARCH_ARMv6) {
                 printk(KERN_WARNING "Only cachepolicy=writeback supported on ARMv6 and later\n");
                 cachepolicy = CPOLICY_WRITEBACK;