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

vineetgarc · vineetgarc · commit fedf5b9bafca · 2013-06-22T19:23:19.000+05:30
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 &lt;vgupta@synopsys.com&gt;
diff --git 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);
 	}

Original file line number	Diff line number	Diff line change
`@@ -742,6 +742,7 @@ void copy_user_highpage(struct page to, struct page from,`
`742`	`742`	`*/`
`743`	`743`	`if (clean_src_k_mappings) {`
`744`	`744`	`__flush_dcache_page(kfrom, kfrom);`
	`745`	`+ clear_bit(PG_arch_1, &from->flags);`
`745`	`746`	`} else {`
`746`	`747`	`set_bit(PG_arch_1, &from->flags);`
`747`	`748`	`}`