From nobody Fri Jan 2 22:25:05 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8C73E95A62 for ; Sat, 7 Oct 2023 09:52:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343767AbjJGJws (ORCPT ); Sat, 7 Oct 2023 05:52:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33696 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234148AbjJGJwr (ORCPT ); Sat, 7 Oct 2023 05:52:47 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D8C28B9; Sat, 7 Oct 2023 02:52:45 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A47A3C433C8; Sat, 7 Oct 2023 09:52:42 +0000 (UTC) From: Huacai Chen To: Arnd Bergmann , Huacai Chen Cc: loongarch@lists.linux.dev, linux-arch@vger.kernel.org, Xuefeng Li , Guo Ren , Xuerui Wang , Jiaxun Yang , linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn, Huacai Chen , Deepak R Varma Subject: [PATCH] LoongArch: Replace kmap_atomic() with kmap_local_page() in copy_user_highpage() Date: Sat, 7 Oct 2023 17:52:29 +0800 Message-Id: <20231007095229.235551-1-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.39.3 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 Signed-off-by: Huacai Chen --- 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 ddf1330c924c..4dd53427f657 100644 --- a/arch/loongarch/mm/init.c +++ b/arch/loongarch/mm/init.c @@ -43,11 +43,11 @@ void copy_user_highpage(struct page *to, struct page *f= rom, { void *vfrom, *vto; =20 - vto =3D kmap_atomic(to); - vfrom =3D kmap_atomic(from); + vfrom =3D kmap_local_page(from); + vto =3D 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(); } --=20 2.39.3