From patchwork Mon Oct 28 09:07:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yury Khrustalev X-Patchwork-Id: 2003490 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=linuxppc-dev+bounces-2650-incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=patchwork.ozlabs.org) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (secp384r1) server-digest SHA384) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4XclDY157tz1xwK for ; Tue, 29 Oct 2024 07:22:21 +1100 (AEDT) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4XclDY04Vzz2xJ8; Tue, 29 Oct 2024 07:22:21 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1730106491; cv=none; b=n8sM6H2NotDwvN707PrqM5GgdgIbmiYDrv+4L68vP1B+0EtNHTRi376+mVaYxgLkBO11OBCd7zG/c3DfmZS+YH/BGgZN8LFma29OrTy8+DDDdLnE5R9n2ek0+1uXcRpyuqbwq+WyNL/xH4FeAUl8mCbeVO+3C/rz87+HCjp6+Lf98tbutGrdKZcMtbogRFdgFkespNbXrpQOeS0HC2wBg6edOPrGGh0XEp1aLj3gA5C1C77OoHjtnZKIMnZVJPsrZKPQKzNhngDTViIK/adIeAaoVZF7bFCKA+po7l0PJhjIm+G8pfq6bu5cz2D0AfrKPzgyCLBUYJIDXGMQA1h7Ew== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1730106491; c=relaxed/relaxed; bh=LkzdMnbG6EutcU8kSQA8wPN0Y398DhDmQMYuIO72ovQ=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=TvYmX3Do5mgEjZ+XybksdbEFWZv6aXPX2BcGAMKJljfoOOxfqdyjI+Uvx1btJm379ehjwPDh0Chrv2tKjlVX+y9q8PDnMcadz3NCpb7cLv67e2QQg8v4mzQ4RO0n6CPBYMoAfg58M6z1DkUza6oXxE+bOxWg+hkQd4WTLYOdPtkF/u9+vJEc703K5f12TEoOJfu0zkK08JbfC2yyLt1Uoz+PQu3yBD1MDngm55n1AvvFi6Dyz0Jpmikli3nyIdHuGdYI/Znzigxste+XTC08nMJPZz6O/QhwkmzE3tr/Mdt2qL/vE/uQAlylDRIPgGxjUw/v7fYUNTIuf+i3NjjhQg== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass (client-ip=217.140.110.172; helo=foss.arm.com; envelope-from=yury.khrustalev@arm.com; receiver=lists.ozlabs.org) smtp.mailfrom=arm.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=arm.com (client-ip=217.140.110.172; helo=foss.arm.com; envelope-from=yury.khrustalev@arm.com; receiver=lists.ozlabs.org) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lists.ozlabs.org (Postfix) with ESMTP id 4XcSGf3qfWz2xPf for ; Mon, 28 Oct 2024 20:08:10 +1100 (AEDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 4180213D5; Mon, 28 Oct 2024 02:08:09 -0700 (PDT) Received: from udebian.localdomain (unknown [10.57.58.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 394713F66E; Mon, 28 Oct 2024 02:07:38 -0700 (PDT) From: Yury Khrustalev To: linux-arch@vger.kernel.org Cc: Arnd Bergmann , Kevin Brodsky , Joey Gouly , Dave Hansen , Sandipan Das , Michael Ellerman , linuxppc-dev@lists.ozlabs.org, nd@arm.com, Yury Khrustalev Subject: [PATCH v3 1/3] mm/pkey: Add PKEY_UNRESTRICTED macro Date: Mon, 28 Oct 2024 09:07:13 +0000 Message-Id: <20241028090715.509527-2-yury.khrustalev@arm.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241028090715.509527-1-yury.khrustalev@arm.com> References: <20241028090715.509527-1-yury.khrustalev@arm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.3 required=5.0 tests=RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-13) on lists.ozlabs.org Memory protection keys (pkeys) uapi has two macros for pkeys restrictions: - PKEY_DISABLE_ACCESS 0x1 - PKEY_DISABLE_WRITE 0x2 with implicit literal value of 0x0 that means "unrestricted". Code that works with pkeys has to use this literal value when implying that a pkey imposes no restrictions. This may reduce readability because 0 can be written in various ways (e.g. 0x0 or 0) and also because 0 in the context of pkeys can be mistaken for "no permissions" (akin PROT_NONE) while it actually means "no restrictions". This is important because pkeys are oftentimes used near mprotect() that uses PROT_ macros. This patch adds PKEY_UNRESTRICTED macro defined as 0x0. Signed-off-by: Yury Khrustalev --- include/uapi/asm-generic/mman-common.h | 1 + tools/include/uapi/asm-generic/mman-common.h | 1 + 2 files changed, 2 insertions(+) diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h index 6ce1f1ceb432..ea40e27e6dea 100644 --- a/include/uapi/asm-generic/mman-common.h +++ b/include/uapi/asm-generic/mman-common.h @@ -82,6 +82,7 @@ /* compatibility flags */ #define MAP_FILE 0 +#define PKEY_UNRESTRICTED 0x0 #define PKEY_DISABLE_ACCESS 0x1 #define PKEY_DISABLE_WRITE 0x2 #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\ diff --git a/tools/include/uapi/asm-generic/mman-common.h b/tools/include/uapi/asm-generic/mman-common.h index 6ce1f1ceb432..ea40e27e6dea 100644 --- a/tools/include/uapi/asm-generic/mman-common.h +++ b/tools/include/uapi/asm-generic/mman-common.h @@ -82,6 +82,7 @@ /* compatibility flags */ #define MAP_FILE 0 +#define PKEY_UNRESTRICTED 0x0 #define PKEY_DISABLE_ACCESS 0x1 #define PKEY_DISABLE_WRITE 0x2 #define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS |\