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Updates for the x86 boot process:

Browse source 
- Initialize FPU late.
 
    Right now FPU is initialized very early during boot. There is no real
    requirement to do so. The only requirement is to have it done before
    alternatives are patched.
 
    That's done in check_bugs() which does way more than what the function
    name suggests.
 
    So first rename check_bugs() to arch_cpu_finalize_init() which makes it
    clear what this is about.
 
    Move the invocation of arch_cpu_finalize_init() earlier in
    start_kernel() as it has to be done before fork_init() which needs to
    know the FPU register buffer size.
 
    With those prerequisites the FPU initialization can be moved into
    arch_cpu_finalize_init(), which removes it from the early and fragile
    part of the x86 bringup.
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Merge tag 'x86-boot-2023-06-26' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 boot updates from Thomas Gleixner:
 "Initialize FPU late.

  Right now FPU is initialized very early during boot. There is no real
  requirement to do so. The only requirement is to have it done before
  alternatives are patched.

  That's done in check_bugs() which does way more than what the function
  name suggests.

  So first rename check_bugs() to arch_cpu_finalize_init() which makes
  it clear what this is about.

  Move the invocation of arch_cpu_finalize_init() earlier in
  start_kernel() as it has to be done before fork_init() which needs to
  know the FPU register buffer size.

  With those prerequisites the FPU initialization can be moved into
  arch_cpu_finalize_init(), which removes it from the early and fragile
  part of the x86 bringup"

* tag 'x86-boot-2023-06-26' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mem_encrypt: Unbreak the AMD_MEM_ENCRYPT=n build
  x86/fpu: Move FPU initialization into arch_cpu_finalize_init()
  x86/fpu: Mark init functions __init
  x86/fpu: Remove cpuinfo argument from init functions
  x86/init: Initialize signal frame size late
  init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init()
  init: Invoke arch_cpu_finalize_init() earlier
  init: Remove check_bugs() leftovers
  um/cpu: Switch to arch_cpu_finalize_init()
  sparc/cpu: Switch to arch_cpu_finalize_init()
  sh/cpu: Switch to arch_cpu_finalize_init()
  mips/cpu: Switch to arch_cpu_finalize_init()
  m68k/cpu: Switch to arch_cpu_finalize_init()
  loongarch/cpu: Switch to arch_cpu_finalize_init()
  ia64/cpu: Switch to arch_cpu_finalize_init()
  ARM: cpu: Switch to arch_cpu_finalize_init()
  x86/cpu: Switch to arch_cpu_finalize_init()
  init: Provide arch_cpu_finalize_init()
This commit is contained in:
Linus Torvalds 2023-06-26 13:39:10 -07:00
commit 7cffdbe360
44 changed files with 194 additions and 352 deletions
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1
arch/m68k/Kconfig
View file

@ -4,6 +4,7 @@ config M68K
default y
select ARCH_32BIT_OFF_T
select ARCH_HAS_BINFMT_FLAT
select ARCH_HAS_CPU_FINALIZE_INIT if MMU
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DMA_PREP_COHERENT if HAS_DMA && MMU && !COLDFIRE
select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA

21
arch/m68k/include/asm/bugs.h
View file

@ -1,21 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* include/asm-m68k/bugs.h
*
* Copyright (C) 1994 Linus Torvalds
*/
/*
* This is included by init/main.c to check for architecture-dependent bugs.
*
* Needs:
* void check_bugs(void);
*/
#ifdef CONFIG_MMU
extern void check_bugs(void); /* in arch/m68k/kernel/setup.c */
#else
static void check_bugs(void)
{
}
#endif

3
arch/m68k/kernel/setup_mm.c
View file

@ -10,6 +10,7 @@
*/
#include <linux/kernel.h>
#include <linux/cpu.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/delay.h>
@ -504,7 +505,7 @@ static int __init proc_hardware_init(void)
module_init(proc_hardware_init);
#endif
void check_bugs(void)
void __init arch_cpu_finalize_init(void)
{
#if defined(CONFIG_FPU) && !defined(CONFIG_M68KFPU_EMU)
if (m68k_fputype == 0) {