From nobody Wed Apr 8 08:18:58 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 F131FECAAA1 for ; Mon, 24 Oct 2022 09:21:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229887AbiJXJVz (ORCPT ); Mon, 24 Oct 2022 05:21:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51134 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229786AbiJXJVr (ORCPT ); Mon, 24 Oct 2022 05:21:47 -0400 Received: from szxga03-in.huawei.com (szxga03-in.huawei.com [45.249.212.189]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1BE5558EBF for ; Mon, 24 Oct 2022 02:21:45 -0700 (PDT) Received: from dggemv711-chm.china.huawei.com (unknown [172.30.72.56]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4MwqJM5NTWzJn9s; Mon, 24 Oct 2022 17:18:59 +0800 (CST) Received: from kwepemm600017.china.huawei.com (7.193.23.234) by dggemv711-chm.china.huawei.com (10.1.198.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 24 Oct 2022 17:21:44 +0800 Received: from localhost.localdomain (10.175.112.125) by kwepemm600017.china.huawei.com (7.193.23.234) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 24 Oct 2022 17:21:43 +0800 From: Tong Tiangen To: Paul Walmsley , Palmer Dabbelt , Albert Ou CC: , , "Tong Tiangen" , , Guohanjun Subject: [PATCH -next 1/2] riscv/mm: hugepage's PG_dcache_clean flag is only set in head page Date: Mon, 24 Oct 2022 09:47:24 +0000 Message-ID: <20221024094725.3054311-2-tongtiangen@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221024094725.3054311-1-tongtiangen@huawei.com> References: <20221024094725.3054311-1-tongtiangen@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemm600017.china.huawei.com (7.193.23.234) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" HugeTLB pages are always fully mapped, so only setting head page's PG_dcache_clean flag is enough. This refers to the following link: https://lore.kernel.org/lkml/20220331065640.5777-2-songmuchun@bytedance.com/ Signed-off-by: Tong Tiangen --- arch/riscv/include/asm/cacheflush.h | 7 +++++++ arch/riscv/mm/cacheflush.c | 7 +++++++ 2 files changed, 14 insertions(+) diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/c= acheflush.h index 8a5c246b0a21..c172d05de474 100644 --- a/arch/riscv/include/asm/cacheflush.h +++ b/arch/riscv/include/asm/cacheflush.h @@ -17,6 +17,13 @@ static inline void local_flush_icache_all(void) =20 static inline void flush_dcache_page(struct page *page) { + /* + * HugeTLB pages are always fully mapped and only head page will be + * set PG_dcache_clean (see comments in flush_icache_pte()). + */ + if (PageHuge(page)) + page =3D compound_head(page); + if (test_bit(PG_dcache_clean, &page->flags)) clear_bit(PG_dcache_clean, &page->flags); } diff --git a/arch/riscv/mm/cacheflush.c b/arch/riscv/mm/cacheflush.c index 6cb7d96ad9c7..062559c04fc3 100644 --- a/arch/riscv/mm/cacheflush.c +++ b/arch/riscv/mm/cacheflush.c @@ -82,6 +82,13 @@ void flush_icache_pte(pte_t pte) { struct page *page =3D pte_page(pte); =20 + /* + * HugeTLB pages are always fully mapped, so only setting head page's + * PG_dcache_clean flag is enough. + */ + if (PageHuge(page)) + page =3D compound_head(page); + if (!test_and_set_bit(PG_dcache_clean, &page->flags)) flush_icache_all(); } --=20 2.25.1