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Commit ecc9d725 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Greg Kroah-Hartman
Browse files

init: Provide arch_cpu_finalize_init() 



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: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20230613224544.957805717@linutronix.de


Signed-off-by: default avatarDaniel Sneddon <daniel.sneddon@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 767049ce

arch/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -249,6 +249,9 @@ config ARCH_HAS_FORTIFY_SOURCE 
config ARCH_HAS_SET_MEMORY

	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

include/linux/cpu.h

+6 −0
Original line number Diff line number Diff line
@@ -170,6 +170,12 @@ 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);

init/main.c

+5 −0
Original line number Diff line number Diff line
@@ -726,7 +726,12 @@ asmlinkage __visible void __init start_kernel(void) 
	taskstats_init_early();

	delayacct_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();