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Commit e209950f authored by Russell King's avatar Russell King
Browse files

ARM: add PROC_VTABLE and PROC_TABLE macros 



Allow the way we access members of the processor vtable to be changed
at compile time.  We will need to move to per-CPU vtables to fix the
Spectre variant 2 issues on big.Little systems.

However, we have a couple of calls that do not need the vtable
treatment, and indeed cause a kernel warning due to the (later) use
of smp_processor_id(), so also introduce the PROC_TABLE macro for
these which always use CPU 0's function pointers.

Reviewed-by: default avatarJulien Thierry <julien.thierry@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
parent 945aceb1

arch/arm/include/asm/proc-fns.h

+26 −13
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ struct mm_struct; 
/*

 * Don't change this structure - ASM code relies on it.

 */

extern struct processor {

struct processor {

	/* MISC

	 * get data abort address/flags

	 */
@@ -79,9 +79,13 @@ extern struct processor { 
	unsigned int suspend_size;

	void (*do_suspend)(void *);

	void (*do_resume)(void *);

} processor;

};



#ifndef MULTI_CPU

static inline void init_proc_vtable(const struct processor *p)

{

}



extern void cpu_proc_init(void);

extern void cpu_proc_fin(void);

extern int cpu_do_idle(void);
@@ -98,18 +102,27 @@ extern void cpu_reset(unsigned long addr, bool hvc) __attribute__((noreturn)); 
extern void cpu_do_suspend(void *);

extern void cpu_do_resume(void *);

#else

#define cpu_proc_init			processor._proc_init

#define cpu_check_bugs			processor.check_bugs

#define cpu_proc_fin			processor._proc_fin

#define cpu_reset			processor.reset

#define cpu_do_idle			processor._do_idle

#define cpu_dcache_clean_area		processor.dcache_clean_area

#define cpu_set_pte_ext			processor.set_pte_ext

#define cpu_do_switch_mm		processor.switch_mm



/* These three are private to arch/arm/kernel/suspend.c */

#define cpu_do_suspend			processor.do_suspend

#define cpu_do_resume			processor.do_resume

extern struct processor processor;

#define PROC_VTABLE(f)			processor.f

#define PROC_TABLE(f)			processor.f

static inline void init_proc_vtable(const struct processor *p)

{

	processor = *p;

}



#define cpu_proc_init			PROC_VTABLE(_proc_init)

#define cpu_check_bugs			PROC_VTABLE(check_bugs)

#define cpu_proc_fin			PROC_VTABLE(_proc_fin)

#define cpu_reset			PROC_VTABLE(reset)

#define cpu_do_idle			PROC_VTABLE(_do_idle)

#define cpu_dcache_clean_area		PROC_TABLE(dcache_clean_area)

#define cpu_set_pte_ext			PROC_TABLE(set_pte_ext)

#define cpu_do_switch_mm		PROC_VTABLE(switch_mm)



/* These two are private to arch/arm/kernel/suspend.c */

#define cpu_do_suspend			PROC_VTABLE(do_suspend)

#define cpu_do_resume			PROC_VTABLE(do_resume)

#endif



extern void cpu_resume(void);

arch/arm/kernel/setup.c

+1 −3
Original line number Diff line number Diff line
@@ -693,9 +693,7 @@ static void __init setup_processor(void) 
	cpu_name = list->cpu_name;

	__cpu_architecture = __get_cpu_architecture();



#ifdef MULTI_CPU

	processor = *list->proc;

#endif

	init_proc_vtable(list->proc);

#ifdef MULTI_TLB

	cpu_tlb = *list->tlb;

#endif