linux-kernel - [PATCH AUTOSEL 6.5 42/52] LoongArch: Replace kmap_atomic() with kmap_local_page() in copy_user

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Message-ID: <20231029225441.789781-42-sashal@kernel.org>
Date:   Sun, 29 Oct 2023 18:53:29 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Huacai Chen <chenhuacai@...ngson.cn>,
        Deepak R Varma <drv@...lo.com>,
        Sasha Levin <sashal@...nel.org>, chenhuacai@...nel.org,
        maobibo@...ngson.cn, akpm@...ux-foundation.org,
        chenfeiyang@...ngson.cn, arnd@...db.de, loongarch@...ts.linux.dev
Subject: [PATCH AUTOSEL 6.5 42/52] LoongArch: Replace kmap_atomic() with kmap_local_page() in copy_user_highpage()

From: Huacai Chen <chenhuacai@...ngson.cn>

[ 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@...lo.com>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/loongarch/mm/init.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c
index 51c9a6c90a169..d967d881c3fef 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();
 }
-- 
2.42.0