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=-8.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 7C9DAC43603 for ; Thu, 12 Dec 2019 10:48:41 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5416420663 for ; Thu, 12 Dec 2019 10:48:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="QrtXTlZO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5416420663 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=l0vh6cs9pbih0hPgoqng0VsvRT8RLAD5gxPYUtYCEdE=; b=QrtXTlZOa039Tl 4SAeEW/uel6diQwR0Jl/4/odMCVuKYWZCbYpTsX98kSVaLnxuqrx7ZbHFnJCD9tGqf6LoBqKBGnWL 99s9XTVhonNkEZhM9o0gkX9haYTU0jLSCvlw60VySbnMzYdNGczNfAl/mKdVBduWw3f1kDVvTSmSB Y5xgOw2SOY4RhJOG4wmFxDa+mCpCLfUrjTOBY5NOhOEA4bHQ/g46NLuVCrd7umVuG0CWyWYRL3gbT 6iHvw1Ua1XOWsuQxWgif2bDh9DD3GF32bLlWpiYz54tEjCWZiQGnzIWBxjKe591dOkNz2vElyILMd h9074SL3T3Ix4uU4YmIw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ifM1Q-0007Pp-UC; Thu, 12 Dec 2019 10:48:40 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ifM1O-0007PL-2i for linux-arm-kernel@lists.infradead.org; Thu, 12 Dec 2019 10:48:39 +0000 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 E37C9328; Thu, 12 Dec 2019 02:48:36 -0800 (PST) Received: from arrakis.emea.arm.com (arrakis.cambridge.arm.com [10.1.197.42]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 117503F718; Thu, 12 Dec 2019 02:48:33 -0800 (PST) Date: Thu, 12 Dec 2019 10:48:32 +0000 From: Catalin Marinas To: Mark Brown Subject: Re: [PATCH v4 03/12] mm: Reserve asm-generic prot flag 0x10 for arch use Message-ID: <20191212104831.GD18258@arrakis.emea.arm.com> References: <20191211154206.46260-1-broonie@kernel.org> <20191211154206.46260-4-broonie@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20191211154206.46260-4-broonie@kernel.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191212_024838_168160_8604D16C X-CRM114-Status: GOOD ( 15.73 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paul Elliott , Peter Zijlstra , Andrew Jones , Amit Kachhap , Vincenzo Frascino , Will Deacon , linux-arch@vger.kernel.org, Marc Zyngier , Eugene Syromiatnikov , Szabolcs Nagy , Dave Martin , "H.J. Lu" , Yu-cheng Yu , Kees Cook , Arnd Bergmann , Jann Horn , Richard Henderson , Kristina =?utf-8?Q?Mart=C5=A1enko?= , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Florian Weimer , linux-kernel@vger.kernel.org, Sudakshina Das Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Dec 11, 2019 at 03:41:57PM +0000, Mark Brown wrote: > From: Dave Martin > > The asm-generic mman definitions are used by a few architectures > that also define an arch-specific PROT flag with value 0x10. This > currently applies to sparc and powerpc, and arm64 will soon join > in. > > To help future maintainers, document the use of this flag in the > asm-generic header too. > > Signed-off-by: Dave Martin > Signed-off-by: Mark Brown > --- > include/uapi/asm-generic/mman-common.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/include/uapi/asm-generic/mman-common.h b/include/uapi/asm-generic/mman-common.h > index c160a5354eb6..81442d2aaecb 100644 > --- a/include/uapi/asm-generic/mman-common.h > +++ b/include/uapi/asm-generic/mman-common.h > @@ -11,6 +11,7 @@ > #define PROT_WRITE 0x2 /* page can be written */ > #define PROT_EXEC 0x4 /* page can be executed */ > #define PROT_SEM 0x8 /* page may be used for atomic ops */ > + /* 0x10 reserved for arch-specific use */ > #define PROT_NONE 0x0 /* page can not be accessed */ > #define PROT_GROWSDOWN 0x01000000 /* mprotect flag: extend change to start of growsdown vma */ > #define PROT_GROWSUP 0x02000000 /* mprotect flag: extend change to end of growsup vma */ Since the BTI will likely be merged before the MTE series, please consider reserving 0x20 as well. The updated patch, acked by Arnd: https://lore.kernel.org/linux-arm-kernel/20191211184027.20130-2-catalin.marinas@arm.com/ -- Catalin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel