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init: Provide arch_cpu_finalize_init()

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commit 7725acaa4f0c04fbefb0e0d342635b967bb7d414 upstream

check_bugs() has become a dumping ground for all sorts of activities to
finalize the CPU initialization before running the rest of the init code.

Most are empty, a few do actual bug checks, some do alternative patching
and some cobble a CPU advertisement string together....

Aside of that the current implementation requires duplicated function
declaration and mostly empty header files for them.

Provide a new function arch_cpu_finalize_init(). Provide a generic
declaration if CONFIG_ARCH_HAS_CPU_FINALIZE_INIT is selected and a stub
inline otherwise.

This requires a temporary #ifdef in start_kernel() which will be removed
along with check_bugs() once the architectures are converted over.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230613224544.957805717@linutronix.de
Signed-off-by: Daniel Sneddon <daniel.sneddon@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Gleixner 2023-06-14 01:39:22 +02:00 committed by Greg Kroah-Hartman
parent 887433e4bc
commit afe787cf25
3 changed files with 14 additions and 0 deletions
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3
arch/Kconfig
View File

@ -271,6 +271,9 @@ config ARCH_HAS_UNCACHED_SEGMENT
select ARCH_HAS_DMA_PREP_COHERENT
bool
config ARCH_HAS_CPU_FINALIZE_INIT
bool
# Select if arch init_task must go in the __init_task_data section
config ARCH_TASK_STRUCT_ON_STACK
bool

6
include/linux/cpu.h
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@ -193,6 +193,12 @@ void arch_cpu_idle_enter(void);
void arch_cpu_idle_exit(void);
void arch_cpu_idle_dead(void);
#ifdef CONFIG_ARCH_HAS_CPU_FINALIZE_INIT
void arch_cpu_finalize_init(void);
#else
static inline void arch_cpu_finalize_init(void) { }
#endif
int cpu_report_state(int cpu);
int cpu_check_up_prepare(int cpu);
void cpu_set_state_online(int cpu);

5
init/main.c
View File

@ -772,7 +772,12 @@ asmlinkage __visible void __init start_kernel(void)
delayacct_init();
poking_init();
arch_cpu_finalize_init();
/* Temporary conditional until everything has been converted */
#ifndef CONFIG_ARCH_HAS_CPU_FINALIZE_INIT
check_bugs();
#endif
acpi_subsystem_init();
arch_post_acpi_subsys_init();