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h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=AtPDByQBMPrHWCGI+vzy8WZd8eQnzbzM+qXJF88Fb2WB2o+PZTPwNlkkLKmrTUk6a /nwKfiQrc6wYyXRaN6OA6gbPyymGlSuF1oyKtg540JImmdKhvgid+pRKDF07JtieKB NlA+yUHTFyuUArFshov6HbYhiR25PIUQJHWNr+dbDyiaN0DzNqG8Qlf2MYLHLsLyG9 3J4g/EJpZBuBi9pumrYn/UbP6yFmGs+Xl7X/nbVEGEg1jPhUdmbrWZVlXkUXCBrk1/ EZ6HOCVUVgIPIyUCzZqJdvMElRaDA3YoyHt+AJbRRYYSEXBbqAVAXVfC0pqegdYl3e gwkBSyyWTVV1g== Message-ID: <99208d95-d3de-44d0-8b08-f508759aabca@zytor.com> Date: Sun, 16 Jun 2024 00:26:48 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RESEND v1 2/3] x86/cpufeatures: Generate a feature mask header based on build config From: Xin Li To: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, will@kernel.org, peterz@infradead.org, akpm@linux-foundation.org, acme@kernel.org, namhyung@kernel.org References: <20240509205340.275568-1-xin@zytor.com> <20240509205340.275568-3-xin@zytor.com> Content-Language: en-US Autocrypt: addr=xin@zytor.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/9/2024 1:53 PM, Xin Li (Intel) wrote: > From: "H. Peter Anvin (Intel)" > > Introduce an AWK script to auto-generate a header with required and > disabled feature masks based on and current build > config. Thus for any CPU feature with a build config, e.g., X86_FRED, > simply add ... > + > + printf "\n#define %s_MASKS ", s; > + pfx = "{"; > + for (i = 0; i < ncapints; i++) { > + printf "%s \\\n\t%s_MASK_%d", pfx, s, i; > + pfx = ","; > + } > + printf " \\\n}\n\n"; > + > + printf "#define %s_FEATURE(x) \\\n", s; > + printf "\t((( "; > + for (i = 0; i < ncapints; i++) { > + if (masks[i]) { > + printf "\\\n\t\t((x) >> 5) == %2d ? %s_MASK%-3d : ", i, s, i; > + } > + } > + printf "0 \\\n"; > + printf "\t) >> ((x) & 31)) & 1)\n\n"; This code generates macros {REQUIRED,DISABLED}_FEATURE(x) to tell if a CPU feature, e.g., X86_FEATURE_FRED, is a required or disabled feature for this particular compile-time configuration. But they are NOT currently used, so I prefer to remove them for now. Thanks! Xin