LoongArch: Replace kmap_atomic() with kmap_local_page() in copy_user_highpage()

[ Upstream commit 477a0ebec101359f49d92796e3b609857d564b52 ]

Replace kmap_atomic()/kunmap_atomic() calls with kmap_local_page()/
kunmap_local() in copy_user_highpage() which can be invoked from both
preemptible and atomic context [1].

[1] https://lore.kernel.org/all/20201029222652.302358281@linutronix.de/

Suggested-by: Deepak R Varma <drv@mailo.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c
index c74da77..f42a3be 100644 (file)
--- a/arch/loongarch/mm/init.c
+++ b/arch/loongarch/mm/init.c
@@ -68,11 +68,11 @@ void copy_user_highpage(struct page *to, struct page *from,
 {
        void *vfrom, *vto;
 
-       vto = kmap_atomic(to);
-       vfrom = kmap_atomic(from);
+       vfrom = kmap_local_page(from);
+       vto = kmap_local_page(to);
        copy_page(vto, vfrom);
-       kunmap_atomic(vfrom);
-       kunmap_atomic(vto);
+       kunmap_local(vfrom);
+       kunmap_local(vto);
        /* Make sure this page is cleared on other CPU's too before using it */
        smp_wmb();
 }