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X-CSE-ConnectionGUID: Hyv+Pnp4Rsin6U2XV4bc+Q== X-CSE-MsgGUID: pX5XeerLRayK82xQLe8zBg== X-IronPort-AV: E=McAfee;i="6600,9927,11063"; a="10415364" X-IronPort-AV: E=Sophos;i="6.07,251,1708416000"; d="scan'208";a="10415364" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by fmvoesa112.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 May 2024 09:42:00 -0700 X-CSE-ConnectionGUID: K6Vn7gjMR26u5PtnJMH4hA== X-CSE-MsgGUID: 6T7K0AKiRK+99ocJX5AK6w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,251,1708416000"; d="scan'208";a="32305945" Received: from zhangche-mobl.amr.corp.intel.com (HELO [10.209.82.31]) ([10.209.82.31]) by orviesa004-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 May 2024 09:41:58 -0700 Message-ID: <37447227-b478-4751-953f-b7199a6a55d0@intel.com> Date: Fri, 3 May 2024 09:41:57 -0700 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 03/29] mm: use ARCH_PKEY_BITS to define VM_PKEY_BITN 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> <20240503130147.1154804-4-joey.gouly@arm.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/3/24 06:01, Joey Gouly wrote: > #ifdef CONFIG_ARCH_HAS_PKEYS > -# define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 > -# define VM_PKEY_BIT0 VM_HIGH_ARCH_0 /* A protection key is a 4-bit value */ > -# define VM_PKEY_BIT1 VM_HIGH_ARCH_1 /* on x86 and 5-bit value on ppc64 */ > -# define VM_PKEY_BIT2 VM_HIGH_ARCH_2 > -# define VM_PKEY_BIT3 VM_HIGH_ARCH_3 > -#ifdef CONFIG_PPC > +# define VM_PKEY_SHIFT VM_HIGH_ARCH_BIT_0 > +# define VM_PKEY_BIT0 VM_HIGH_ARCH_0 > +# define VM_PKEY_BIT1 VM_HIGH_ARCH_1 > +# define VM_PKEY_BIT2 VM_HIGH_ARCH_2 > +#if CONFIG_ARCH_PKEY_BITS > 3 > +# define VM_PKEY_BIT3 VM_HIGH_ARCH_3 > +#else > +# define VM_PKEY_BIT3 0 > +#endif > +#if CONFIG_ARCH_PKEY_BITS > 4 It's certainly not pretty, but it does get the arch #ifdef out of generic code. We might need to rethink this if we get another architecture or two, but this seems manageable for now. Acked-by: Dave Hansen