From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 5DF77186E4C for ; Mon, 15 Jul 2024 09:22:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721035327; cv=none; b=PH3rYalE99rvSCJ9BZsQE6N0C2qY2Cioa+KoUy/tysa6PabFsDSyOtu74WgoftldsyLYOVqZ8tfJkhV87fCvgvFH1z4tjRYEovJvw2onzY0VXUrK2KGk8yR/5wrzvtUftsFmCLf+824ciHD7JILmoOQTh1c271XeYpE5b+NAaGs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721035327; c=relaxed/simple; bh=9i3Vi6g/p2Zw7XipkMFMxQUKLgYefX20zTZNai4EXMo=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=X4iVcCIs2+7UyMFJJH94BAxm/kl1dq/MxKIDVjM3NMo02D4GXYVESaeqt1M9lUGVvrmlnhoG2GuErzXboWokSWkPaaTJ1PKjnQGK6haverMCdIuObu9/SXU5bL176ND2Vt0XbQwZE2iqeBiv1z/r9btJbtoUcScLvVrhmSREMm0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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 E38B7DA7; Mon, 15 Jul 2024 02:22:30 -0700 (PDT) Received: from [10.162.40.16] (a077893.blr.arm.com [10.162.40.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 89DCE3F73F; Mon, 15 Jul 2024 02:21:57 -0700 (PDT) Message-ID: <388128db-1ddc-453f-9154-df2c5e255a2d@arm.com> Date: Mon, 15 Jul 2024 14:51:54 +0530 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 11/29] arm64: re-order MTE VM_ flags To: Joey Gouly , linux-arm-kernel@lists.infradead.org Cc: akpm@linux-foundation.org, aneesh.kumar@kernel.org, aneesh.kumar@linux.ibm.com, bp@alien8.de, broonie@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, dave.hansen@linux.intel.com, hpa@zytor.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, maz@kernel.org, mingo@redhat.com, mpe@ellerman.id.au, naveen.n.rao@linux.ibm.com, npiggin@gmail.com, oliver.upton@linux.dev, shuah@kernel.org, szabolcs.nagy@arm.com, tglx@linutronix.de, will@kernel.org, x86@kernel.org, kvmarm@lists.linux.dev References: <20240503130147.1154804-1-joey.gouly@arm.com> <20240503130147.1154804-12-joey.gouly@arm.com> Content-Language: en-US From: Anshuman Khandual In-Reply-To: <20240503130147.1154804-12-joey.gouly@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/3/24 18:31, Joey Gouly wrote: > To make it easier to share the generic PKEYs flags, move the MTE flag. The change looks good but too less details about it here. Please do consider adding some more description, on how moving the VM flags down the arch range helps going forward. > > Signed-off-by: Joey Gouly > Cc: Catalin Marinas > Cc: Will Deacon > --- > include/linux/mm.h | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 5605b938acce..2065727b3787 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -377,8 +377,8 @@ extern unsigned int kobjsize(const void *objp); > #endif > > #if defined(CONFIG_ARM64_MTE) > -# define VM_MTE VM_HIGH_ARCH_0 /* Use Tagged memory for access control */ > -# define VM_MTE_ALLOWED VM_HIGH_ARCH_1 /* Tagged memory permitted */ > +# define VM_MTE VM_HIGH_ARCH_4 /* Use Tagged memory for access control */ > +# define VM_MTE_ALLOWED VM_HIGH_ARCH_5 /* Tagged memory permitted */ > #else > # define VM_MTE VM_NONE > # define VM_MTE_ALLOWED VM_NONE