linux-kernel - [PATCH 0/6] x86-64: Remove global variables from boot

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Message-Id: <20230222221301.245890-1-brgerst@gmail.com>
Date:   Wed, 22 Feb 2023 17:12:55 -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 0/6] x86-64: Remove global variables from boot

This is on top of the parallel boot v10 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.

Brian Gerst (6):
  x86/smpboot: Use CPU number instead of APIC ID for single CPU startup
  x86/smpboot: Use current_task to get idle thread
  x86/smpboot: Remove initial_stack on 64-bit
  x86/smpbppt: Remove early_gdt_descr on 64-bit
  x86/smpboot: Remove initial_gs
  x86/smpboot: Simplify boot CPU setup

 arch/x86/include/asm/processor.h |   6 +-
 arch/x86/include/asm/realmode.h  |   1 -
 arch/x86/include/asm/smp.h       |   1 -
 arch/x86/kernel/acpi/sleep.c     |   5 +-
 arch/x86/kernel/asm-offsets.c    |   1 +
 arch/x86/kernel/head_64.S        | 108 ++++++++++++-------------------
 arch/x86/kernel/smpboot.c        |   6 +-
 arch/x86/xen/xen-head.S          |   2 +-
 kernel/smpboot.c                 |   2 +-
 9 files changed, 53 insertions(+), 79 deletions(-)

-- 
2.39.2