linux-kernel - [PATCH v2 0/5] x86-64: Remove global variables from boot

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Message-Id: <20230224154235.277350-1-brgerst@gmail.com>
Date:   Fri, 24 Feb 2023 10:42:30 -0500
From:   Brian Gerst <brgerst@...il.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Usama Arif <usama.arif@...edance.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, Brian Gerst <brgerst@...il.com>
Subject: [PATCH v2 0/5] x86-64: Remove global variables from boot

This is based on the parallel boot v11 series.

Remove the global variables initial_gs, initial_stack, and
early_gdt_descr from the 64-bit boot code.  The stack, GDT, and GSBASE
can be determined from the CPU number.

v2: - Dropped first two patches which were merged into another patch in
      the parallel boot series.
    - Fixed a compile error in patch 1 found by the kernel test robot.
    - Split out the removal of STARTUP_SECONDARY into a separate patch
      and renumber the remaining flags.

Brian Gerst (5):
  x86/smpboot: Remove initial_stack on 64-bit
  x86/smpboot: Remove early_gdt_descr on 64-bit
  x86/smpboot: Remove initial_gs
  x86/smpboot: Simplify boot CPU setup
  x86/smpboot: Remove STARTUP_SECONDARY

 arch/x86/include/asm/processor.h |  6 +-
 arch/x86/include/asm/realmode.h  |  1 -
 arch/x86/include/asm/smp.h       |  5 +-
 arch/x86/kernel/acpi/sleep.c     |  5 +-
 arch/x86/kernel/head_64.S        | 99 ++++++++++++--------------------
 arch/x86/kernel/smpboot.c        |  6 +-
 arch/x86/xen/xen-head.S          |  2 +-
 7 files changed, 49 insertions(+), 75 deletions(-)

-- 
2.39.2