ARC: [mm] optimise VIPT dcache aliasing 2/x

Non-congruent SRC page in copy_user_page() is dcache clean in the end -
so record that fact, to avoid a subsequent extraneous flush.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/mm/cache_arc700.c b/arch/arc/mm/cache_arc700.c
index 4e54ef5..0746587 100644 (file)
--- a/arch/arc/mm/cache_arc700.c
+++ b/arch/arc/mm/cache_arc700.c
@@ -742,6 +742,7 @@ void copy_user_highpage(struct page *to, struct page *from,
         */
        if (clean_src_k_mappings) {
                __flush_dcache_page(kfrom, kfrom);
+               clear_bit(PG_arch_1, &from->flags);
        } else {
                set_bit(PG_arch_1, &from->flags);
        }