[PATCH v4 14/15] ARM: Enable selection of SMP operations at boot time

[Olof Johansson]

On Tue, Feb 05, 2013 at 12:22:11AM -0500, Nicolas Pitre wrote:
> From: Jon Medhurst <tixy at linaro.org>
> 
> Add a new 'smp_init' hook to machine_desc so platforms can specify a
> function to be used to setup smp ops instead of having a statically
> defined value.
> 
> Signed-off-by: Jon Medhurst <tixy at linaro.org>
> Signed-off-by: Nicolas Pitre <nicolas.pitre at linaro.org>
> Reviewed-by: Santosh Shilimkar <santosh.shilimkar at ti.com>
> ---
>  arch/arm/include/asm/mach/arch.h | 3 +++
>  arch/arm/kernel/setup.c          | 5 ++++-
>  2 files changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h
> index 917d4fcfd9..3d01c6d6c3 100644
> --- a/arch/arm/include/asm/mach/arch.h
> +++ b/arch/arm/include/asm/mach/arch.h
> @@ -17,8 +17,10 @@ struct pt_regs;
>  struct smp_operations;
>  #ifdef CONFIG_SMP
>  #define smp_ops(ops) (&(ops))
> +#define smp_init_ops(ops) (&(ops))
>  #else
>  #define smp_ops(ops) (struct smp_operations *)NULL
> +#define smp_init_ops(ops) (void (*)(void))NULL
>  #endif
>  
>  struct machine_desc {
> @@ -42,6 +44,7 @@ struct machine_desc {
>  	unsigned char		reserve_lp2 :1;	/* never has lp2	*/
>  	char			restart_mode;	/* default restart mode	*/
>  	struct smp_operations	*smp;		/* SMP operations	*/
> +	void			(*smp_init)(void);
>  	void			(*fixup)(struct tag *, char **,
>  					 struct meminfo *);
>  	void			(*reserve)(void);/* reserve mem blocks	*/
> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
> index 3f6cbb2e3e..41edca8582 100644
> --- a/arch/arm/kernel/setup.c
> +++ b/arch/arm/kernel/setup.c
> @@ -768,7 +768,10 @@ void __init setup_arch(char **cmdline_p)
>  	arm_dt_init_cpu_maps();
>  #ifdef CONFIG_SMP
>  	if (is_smp()) {
> -		smp_set_ops(mdesc->smp);
> +		if(mdesc->smp_init)

This will fail checkpatch: if() instead of if ().

> +			(*mdesc->smp_init)();

This is different calling style than init_early() below, which uses
mdesc->init_early(). Please be consistent.

> +		else
> +			smp_set_ops(mdesc->smp);


-Olof