From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8FC9EC2D0A9 for ; Mon, 27 Jul 2020 23:29:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 56898208E4 for ; Mon, 27 Jul 2020 23:29:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595892588; bh=O8sbMn7Pvn99MTZ61vvAbPtt75NieU4YRkG3Qh3NqLU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=WsMM86WGYuf1AWSsDCMkdqVCbiDvsgsIgqp1y//wilJCFmQmOj2HjRRA6j9sRmdyZ EVoMH7AIbjH67H+J+7a51Lw4vcIFNuYXKr0EKOKsqR8i8PAqZxsUojQkWRfDcKFBK3 SaVuQyt1upYQe4HWsFWdsYSuzRXJlUZwpn9bN7GY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728851AbgG0X3q (ORCPT ); Mon, 27 Jul 2020 19:29:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:34880 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727957AbgG0XYC (ORCPT ); Mon, 27 Jul 2020 19:24:02 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A1A5920FC3; Mon, 27 Jul 2020 23:24:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595892241; bh=O8sbMn7Pvn99MTZ61vvAbPtt75NieU4YRkG3Qh3NqLU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ADMVAtkyNTFjYb8aufIGF544EHZr0f9MKN4vbzqS5ZzOwVAr66aqW0HbU9zM/Frxo cxtAOH5p1pPg/ImotE0GVvAiIYGB5DKSTEVAxfZ3eCZjTbj0ASae4g7MBhxDDf9H4s T9JKK4b3q/4EUgLr2LEzBf8l5SL6iSmX2J0OOTVg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Vincent Chen , Palmer Dabbelt , Sasha Levin , kasan-dev@googlegroups.com, linux-riscv@lists.infradead.org Subject: [PATCH AUTOSEL 5.7 11/25] riscv: kasan: use local_tlb_flush_all() to avoid uninitialized __sbi_rfence Date: Mon, 27 Jul 2020 19:23:31 -0400 Message-Id: <20200727232345.717432-11-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200727232345.717432-1-sashal@kernel.org> References: <20200727232345.717432-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vincent Chen [ Upstream commit 4cb699d0447be8e0906539f93cbe41e19598ee5a ] It fails to boot the v5.8-rc4 kernel with CONFIG_KASAN because kasan_init and kasan_early_init use uninitialized __sbi_rfence as executing the tlb_flush_all(). Actually, at this moment, only the CPU which is responsible for the system initialization enables the MMU. Other CPUs are parking at the .Lsecondary_start. Hence the tlb_flush_all() is able to be replaced by local_tlb_flush_all() to avoid using uninitialized __sbi_rfence. Signed-off-by: Vincent Chen Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin --- arch/riscv/mm/kasan_init.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/riscv/mm/kasan_init.c b/arch/riscv/mm/kasan_init.c index ec0ca90dd9000..7a580c8ad6034 100644 --- a/arch/riscv/mm/kasan_init.c +++ b/arch/riscv/mm/kasan_init.c @@ -44,7 +44,7 @@ asmlinkage void __init kasan_early_init(void) (__pa(((uintptr_t) kasan_early_shadow_pmd))), __pgprot(_PAGE_TABLE))); - flush_tlb_all(); + local_flush_tlb_all(); } static void __init populate(void *start, void *end) @@ -79,7 +79,7 @@ static void __init populate(void *start, void *end) pfn_pgd(PFN_DOWN(__pa(&pmd[offset])), __pgprot(_PAGE_TABLE))); - flush_tlb_all(); + local_flush_tlb_all(); memset(start, 0, end - start); } -- 2.25.1