Commit 7725acaa authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

init: Provide arch_cpu_finalize_init() 



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
parent f1fcbaa1

arch/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -285,6 +285,9 @@ config ARCH_HAS_DMA_SET_UNCACHED 
config ARCH_HAS_DMA_CLEAR_UNCACHED

	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
@@ -184,6 +184,12 @@ void arch_cpu_idle_enter(void); 
void arch_cpu_idle_exit(void);

void __noreturn 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

+4 −0
Original line number Diff line number Diff line
@@ -1078,7 +1078,11 @@ asmlinkage __visible void __init __no_sanitize_address __noreturn start_kernel(v 
	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();