From: Huacai Chen <chenhuacai@loongson.cn>
Date: Wed, 18 Oct 2023 00:42:52 +0000 (+0800)
Subject: LoongArch: Replace kmap_atomic() with kmap_local_page() in copy_user_highpage()
X-Git-Tag: v6.1.68~1176
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ec80ad4585d7163dcf8cad7c95f6b5d526b107dd;p=platform%2Fkernel%2Flinux-starfive.git

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
--- 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();
 }