Re: [PATCH v5 07/12] x86/apic: Unify interrupt mode setup for UP system

[Thomas Gleixner]

On Fri, 30 Jun 2017, Dou Liyang wrote:
>  static inline int apic_force_enable(unsigned long addr)
> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
> index 0601054..9bf7e95 100644
> --- a/arch/x86/kernel/apic/apic.c
> +++ b/arch/x86/kernel/apic/apic.c
> @@ -1198,6 +1198,10 @@ static int __init apic_intr_mode_select(int *upmode)
>       }
>  #endif
>  
> +#ifdef CONFIG_UP_LATE_INIT
> +     *upmode = true;
> +#endif

This is really wrong. The upmode decision, which is required for calling
apic_bsp_setup() should not happen here, really. As I told you in the
previous patch, use the return code and then you can make further decisions
in apic_intr_mode_init().

And you do it there w/o any ifdeffery:

static void apic_intr_mode_init(void)
{
        bool upmode = IS_ENABLED(CONFIG_UP_LATE_INIT);

        switch (....) {
        case XXXX:
                upmode = true;
                ....
        }
        apic_bsp_setup(upmode);
}

Thanks,

        tglx