From: Vineet Gupta <vgupta@synopsys.com>
Date: Thu, 23 May 2013 06:32:00 +0000 (+0530)
Subject: ARC: [mm] optimise VIPT dcache aliasing 2/x
X-Git-Tag: firefly_0821_release~176^2~5807^2~21
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fedf5b9bafca5cd8af99993d1b9cfd13c1dc2c5b;p=firefly-linux-kernel-4.4.55.git

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 4e54ef5b4c2a..074658704d86 100644
--- 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);
 	}