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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 7453CC48BDF for ; Wed, 16 Jun 2021 03:21:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 593FF613E2 for ; Wed, 16 Jun 2021 03:21:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230482AbhFPDXq (ORCPT ); Tue, 15 Jun 2021 23:23:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:42928 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230146AbhFPDXZ (ORCPT ); Tue, 15 Jun 2021 23:23:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2742F613C2; Wed, 16 Jun 2021 03:21:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623813680; bh=uwtQcyv5VK7EnNeu4zAuSiFMzgWca2SQ0MXYCFdFfoE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DUx2c2QdVsJ/e6o1nIEcvcwpfMTTwRZITr/IRvy6cFj1GF8ZkgGPcr9dJhZ0Aahcj Db0jmOS2dBE11jCaQ94u8RnJ6pJzeI5ilMOqW96akpc7Cvs2/ytVSzbGwsBKmp3Rav x9sATIjBcy21giShX/AUB2ujLJV5m/EcwvZ9k6ouu4vHJvfF+Kt4yDD+0EUlgw92UQ Rha8tWvK2dwWtfEwCxxcGLfFBqPBd6JyRHbdy33OZPUUUtbHT9r6q8UGcDUU8UZaD8 rkDV+j+cu6M5kPmGGXrB1FyGOdj2y3fmZIqPlEim+yeXdHGWVovFbYqHPhBF5kbX0j I8AWloY7Mh75A== From: Andy Lutomirski To: x86@kernel.org Cc: Dave Hansen , LKML , linux-mm@kvack.org, Andrew Morton , Andy Lutomirski , Mathieu Desnoyers , Nicholas Piggin , Peter Zijlstra , Russell King , linux-arm-kernel@lists.infradead.org Subject: [PATCH 7/8] membarrier: Remove arm (32) support for SYNC_CORE Date: Tue, 15 Jun 2021 20:21:12 -0700 Message-Id: <2142129092ff9aa00e600c42a26c4015b7f5ceec.1623813516.git.luto@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On arm32, the only way to safely flush icache from usermode is to call cacheflush(2). This also handles any required pipeline flushes, so membarrier's SYNC_CORE feature is useless on arm. Remove it. Cc: Mathieu Desnoyers Cc: Nicholas Piggin Cc: Peter Zijlstra Cc: Russell King Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Andy Lutomirski --- arch/arm/Kconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 24804f11302d..89a885fba724 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -10,7 +10,6 @@ config ARM select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_KEEPINITRD select ARCH_HAS_KCOV - select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PTE_SPECIAL if ARM_LPAE select ARCH_HAS_PHYS_TO_DMA -- 2.31.1