Re: [v2 PATCH 1/3] panic: Change nmi_panic from macro to function

[Michal Hocko <mhocko@kernel.org>]

On Wed 02-03-16 19:36:26, Hidehiro Kawai wrote:
[...]
> +void nmi_panic(struct pt_regs *regs, const char *fmt, ...)

Do we really need vargs? All the current users seem to be OK with a
simple string. This makes the code slightly more complicated without any
apparent reason.

> +{
> +	static char buf[1024]; /* protected by panic_cpu */
> +	va_list args;
> +	int old_cpu, cpu;
> +
> +	cpu = raw_smp_processor_id();
> +	old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, cpu);
> +
> +	if (old_cpu == PANIC_CPU_INVALID) {
> +		va_start(args, fmt);
> +		vsnprintf(buf, sizeof(buf), fmt, args);
> +		va_end(args);
> +
> +		panic("%s", buf);
> +	} else if (old_cpu != cpu)
> +		nmi_panic_self_stop(regs);
> +}
> +EXPORT_SYMBOL(nmi_panic);
> +
>  /**
>   *	panic - halt the system
>   *	@fmt: The text string to print
> 
> 

-- 
Michal Hocko
SUSE Labs