From: Ashok Kumar <ashoks@broadcom.com>
Date: Thu, 17 Dec 2015 09:38:31 +0000 (-0800)
Subject: arm64: Defer dcache flush in __cpu_copy_user_page
X-Git-Tag: firefly_0821_release~176^2~4^2~47^2~95
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=ac7406c28c8bada863d36c46ca246bb7b76f3e9f;p=firefly-linux-kernel-4.4.55.git

arm64: Defer dcache flush in __cpu_copy_user_page

Defer dcache flushing to __sync_icache_dcache by calling
flush_dcache_page which clears PG_dcache_clean flag.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ashok Kumar <ashoks@broadcom.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
(cherry picked from commit e6b1185f77351aa154e63bd54b05d07ff99d4ffa)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
---

diff --git a/arch/arm64/mm/copypage.c b/arch/arm64/mm/copypage.c
index 13bbc3be6f5a..22e4cb4d6f53 100644
--- a/arch/arm64/mm/copypage.c
+++ b/arch/arm64/mm/copypage.c
@@ -24,8 +24,9 @@
 
 void __cpu_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
 {
+	struct page *page = virt_to_page(kto);
 	copy_page(kto, kfrom);
-	__flush_dcache_area(kto, PAGE_SIZE);
+	flush_dcache_page(page);
 }
 EXPORT_SYMBOL_GPL(__cpu_copy_user_page);