linux-kernel - [PATCH v1 0/3] x86/cpufeatures: Automatically generate required and disabled feature masks

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Date: Wed, 31 Jan 2024 21:46:26 -0800
From: "Xin Li (Intel)" <xin@...or.com>
To: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        will@...nel.org, peterz@...radead.org, akpm@...ux-foundation.org,
        acme@...nel.org, namhyung@...nel.org
Subject: [PATCH v1 0/3] x86/cpufeatures: Automatically generate required and disabled feature masks

When a CPU feature is not configured, e.g., CONFIG_X86_FRED=n, in a
build config, its feature disable flag, e.g. DISABLE_FRED, needs to
be defined and added to a specific disabled CPU features mask in
<asm/disabled-features.h>, as the following commit:
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/fred&id=e554a8ca49d6d6d782f546ae4d7f036946e7dd87

This patch set adds an awk script to automatically generate a header
with required and disabled CPU features masks based on build config.


H. Peter Anvin (Intel) (2):
  x86/cpufeatures: Add {required,disabled} feature configs
  x86/cpufeatures: Generate a feature mask header based on build config

Xin Li (Intel) (1):
  x86/cpufeatures: Remove {disabled,required}-features.h

 arch/x86/Kconfig                              |   4 +-
 arch/x86/Kconfig.cpu                          |  16 +-
 arch/x86/Kconfig.cpufeatures                  | 149 +++++++++++++++++
 arch/x86/Makefile                             |  17 +-
 arch/x86/boot/cpucheck.c                      |   3 +-
 arch/x86/boot/cpuflags.c                      |   1 -
 arch/x86/boot/mkcpustr.c                      |   3 +-
 arch/x86/include/asm/Kbuild                   |   1 +
 arch/x86/include/asm/asm-prototypes.h         |   2 +-
 arch/x86/include/asm/atomic64_32.h            |   2 +-
 arch/x86/include/asm/bitops.h                 |   4 +-
 arch/x86/include/asm/cmpxchg_32.h             |   4 +-
 arch/x86/include/asm/cpufeature.h             |   1 +
 arch/x86/include/asm/cpufeatures.h            |   8 -
 arch/x86/include/asm/disabled-features.h      | 154 ------------------
 arch/x86/include/asm/required-features.h      | 104 ------------
 arch/x86/kernel/verify_cpu.S                  |   1 +
 arch/x86/lib/Makefile                         |   2 +-
 arch/x86/lib/cmpxchg8b_emu.S                  |   2 +-
 arch/x86/tools/featuremasks.awk               | 108 ++++++++++++
 lib/atomic64_test.c                           |   2 +-
 tools/arch/x86/include/asm/cpufeatures.h      |   8 -
 .../arch/x86/include/asm/disabled-features.h  | 154 ------------------
 .../arch/x86/include/asm/required-features.h  | 104 ------------
 tools/perf/check-headers.sh                   |   2 -
 25 files changed, 303 insertions(+), 553 deletions(-)
 create mode 100644 arch/x86/Kconfig.cpufeatures
 delete mode 100644 arch/x86/include/asm/disabled-features.h
 delete mode 100644 arch/x86/include/asm/required-features.h
 create mode 100755 arch/x86/tools/featuremasks.awk
 delete mode 100644 tools/arch/x86/include/asm/disabled-features.h
 delete mode 100644 tools/arch/x86/include/asm/required-features.h


base-commit: 078b7b997b47c7166c1240cf1d39db9f646a56be
-- 
2.43.0