Received: by 2002:a05:6a10:206:0:0:0:0 with SMTP id 6csp71397pxj; Tue, 15 Jun 2021 20:24:28 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxCsSxVTjRXGclad7Bu1ECPA7vV6qYkBVEzLUsLZJJIk9G8Uhlu9FFhENaU5/Xg8LESEd0v X-Received: by 2002:a05:6402:4cf:: with SMTP id n15mr1556327edw.162.1623813868480; Tue, 15 Jun 2021 20:24:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1623813868; cv=none; d=google.com; s=arc-20160816; b=Ya/q11gulxFV0qTzvG56LkfWQ5Gja61RVcZh28u4myNVjk7R3MDPqP3AxGLrrulB20 D08/ykZlcXvu2vsAkweEoCLvragKUWqorHSGd2DPz2roieTpqwS6dAMkavSTvbFR3/P8 I9lmSc3XbPfiyEhzKUchIL/DQolRogPFhAEkWECN4zJqYjBSd1Yia4gSSxBNSKvcg7L8 dCGiEA4FJXiimGoDWvaAGbCQE9Fk5BC+ZeCMV0dXclMnoi5LIfJYcNg925nZdkm9hiVR k59QTWHw0W4Wg0qGVq73EvBntnAfHXQzg+6vM67SkGpnt36RX/4KRcT9Z7dumjPeDd2u f6VA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=BI4oV5o/8SSlLs1Gb0rBopg0gxgUZzQiE7Mp69iTrXU=; b=RHnccFaxEXjkrsKTjkzRHt+U7nFDi5c2woL/MdrcUl1p8YRsIVtycbGH6PNUBIlvzU PB9DwostQqmqldziwnBUfACkJnlEk0GGUxcBdQgL82VWdzCsP/NIVKzsbB5xfcZqTSf8 yySmovP2L3Rtr7HyEIATzqteFzDeH71etjsAjkCXZYh9jirUXIzcu0YvRnMPynlW9Eyj uVYUizkBZgusOpTK0bfgRs0ii2GkXdVdWw2XDHyWMnog0gXbnwk+awe5PnT3iPEdUWp6 q+/qQ+HNsJhuqssg4YgLV0z4EFw8caFt15BfDEI+u5A4teDsSpqANya97RmvoDa9G3h9 x6lA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=DUx2c2Qd; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id f12si766959edw.443.2021.06.15.20.23.42; Tue, 15 Jun 2021 20:24:28 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=DUx2c2Qd; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230363AbhFPDXo (ORCPT + 99 others); Tue, 15 Jun 2021 23:23:44 -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