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=ham 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 1FA00C4363A for ; Mon, 26 Oct 2020 23:57:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D88462068D for ; Mon, 26 Oct 2020 23:57:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603756644; bh=mGWUL7X+ybVboEicMyiLHrQ1M9bMdj6pzQd/5kmpbVc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=O8QEos/Lv3pZp7s3yMqjOBf9aAs7H5NRjP4JW32MuWQ916Hm8kKRhizMBfdqLzki9 HpUV1uJzZfWLQj9O12vWVC6RX14ijyJIjO7uxzTUcH9kCe1FOPA8QqNSw6dbWuu6qB oRf6VC98j4Lc9YBsd6gOyYXrLO3hysu6NWMLcHrA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436764AbgJZX5X (ORCPT ); Mon, 26 Oct 2020 19:57:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:33428 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2410897AbgJZXzW (ORCPT ); Mon, 26 Oct 2020 19:55:22 -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 A79E020B1F; Mon, 26 Oct 2020 23:55:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603756521; bh=mGWUL7X+ybVboEicMyiLHrQ1M9bMdj6pzQd/5kmpbVc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IQ/7mz8FW2GdSlVHSADXmANoK7ZGqrCXGYnFGtYpAkLRR8DeCpqcHfrbiVAVxmrcG 7Y7G8/W/ya4gsEYn/YWrEK9MC4q6cJFycL5g4zxjkJ74tsm4LLw/LtLPdq6bBv4CA7 K22i9pGxIo0kw2DXfIvJ3mfz50K69m6nFI9IkOGg= 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 5.4 03/80] powerpc: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM Date: Mon, 26 Oct 2020 19:53:59 -0400 Message-Id: <20201026235516.1025100-3-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201026235516.1025100-1-sashal@kernel.org> References: <20201026235516.1025100-1-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 ad620637cbd11..27ef333e96f6d 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -147,6 +147,7 @@ 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_EXTABLE_SORT diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h index 58efca9343113..f132b418a8c7a 100644 --- a/arch/powerpc/include/asm/mmu_context.h +++ b/arch/powerpc/include/asm/mmu_context.h @@ -216,7 +216,7 @@ 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