linux-kernel - [PATCH 3/3] nds32: Disable local irq before calling cpu_dcache_wb_page in copy_user

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Date:   Tue, 15 May 2018 16:46:03 +0800
From:   Vincent Chen <vincentc@...estech.com>
To:     <linux-kernel@...r.kernel.org>, <green.hu@...il.com>,
        <greentime@...estech.com>, <arnd@...db.de>
CC:     <deanbo422@...il.com>, <vincentc@...estech.com>
Subject: [PATCH 3/3] nds32: Disable local irq before calling cpu_dcache_wb_page in copy_user_highpage

In order to ensure that all data in source page has been written back
to memory before copy_page, the local irq shall be disabled before
calling cpu_dcache_wb_page(). In addition, removing unneeded page
invalidation for 'to' page.

Signed-off-by: Vincent Chen <vincentc@...estech.com>
---
 arch/nds32/mm/cacheflush.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/arch/nds32/mm/cacheflush.c b/arch/nds32/mm/cacheflush.c
index acfdb45..c97caaf 100644
--- a/arch/nds32/mm/cacheflush.c
+++ b/arch/nds32/mm/cacheflush.c
@@ -156,11 +156,9 @@ void copy_user_highpage(struct page *to, struct page *from,
 	pto = page_to_phys(to);
 	pfrom = page_to_phys(from);
 
+	local_irq_save(flags);
 	if (aliasing(vaddr, (unsigned long)kfrom))
 		cpu_dcache_wb_page((unsigned long)kfrom);
-	if (aliasing(vaddr, (unsigned long)kto))
-		cpu_dcache_inval_page((unsigned long)kto);
-	local_irq_save(flags);
 	vto = kremap0(vaddr, pto);
 	vfrom = kremap1(vaddr, pfrom);
 	copy_page((void *)vto, (void *)vfrom);
-- 
1.7.1