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,URIBL_BLOCKED,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 B8AD6C5DF9E for ; Tue, 27 Oct 2020 00:34:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A368217A0 for ; Tue, 27 Oct 2020 00:34:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603758868; bh=M+IWAMsLjR2RprebWmFfC/MIN/2nxWi/EsQSul/qIr4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=OpTpxa6Up5X9gJ8x7gp3t68atE65uAXkxoER9gvXCMYZ9JDM7N52iGT9AYXd+IYi0 xmmI6LoC6SjOk0NotdfYX94gD+Wgiu7TFmzIlFR9GvmN4ZDOTncoRW0YloKe+uZjT/ RSZaktF5mxAHW9tCmhMMnM27+eUOtp8VhVpYeiSs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2443620AbgJ0Aba (ORCPT ); Mon, 26 Oct 2020 20:31:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:54308 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409657AbgJZXwN (ORCPT ); Mon, 26 Oct 2020 19:52:13 -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 3F22821D41; Mon, 26 Oct 2020 23:52:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603756332; bh=M+IWAMsLjR2RprebWmFfC/MIN/2nxWi/EsQSul/qIr4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zvsL8PKuAoGcrGHmkBm8uiawIr9lm6t78d/frDtUKbDp77Bg++XEJM/WWiw6HPPYb zZZjNmiDRAf1MeB4L3DHpMblL/7RJiOeAKESmrSbyHPsumaoatIavtxci3f0ZgXDXU D5y+4zOdGMv4X/+wXkhoIVCkJRKJR6AM73/iFO68= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nicholas Piggin , Michael Ellerman , Sasha Levin , linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 5.8 006/132] powerpc: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM Date: Mon, 26 Oct 2020 19:49:58 -0400 Message-Id: <20201026235205.1023962-6-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201026235205.1023962-1-sashal@kernel.org> References: <20201026235205.1023962-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nicholas Piggin [ Upstream commit 66acd46080bd9e5ad2be4b0eb1d498d5145d058e ] powerpc uses IPIs in some situations to switch a kernel thread away from a lazy tlb mm, which is subject to the TLB flushing race described in the changelog introducing ARCH_WANT_IRQS_OFF_ACTIVATE_MM. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200914045219.3736466-3-npiggin@gmail.com Signed-off-by: Sasha Levin --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/mmu_context.h | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 9fa23eb320ff5..1692c9def44c9 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -146,6 +146,7 @@ config PPC select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF if PPC64 select ARCH_WANT_IPC_PARSE_VERSION + select ARCH_WANT_IRQS_OFF_ACTIVATE_MM select ARCH_WEAK_RELEASE_ACQUIRE select BINFMT_ELF select BUILDTIME_TABLE_SORT diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h index 1a474f6b1992a..6cb10c7a52025 100644 --- a/arch/powerpc/include/asm/mmu_context.h +++ b/arch/powerpc/include/asm/mmu_context.h @@ -246,7 +246,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, */ static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next) { - switch_mm(prev, next, current); + switch_mm_irqs_off(prev, next, current); } /* We don't currently use enter_lazy_tlb() for anything */ -- 2.25.1