Re: [PATCH V3 02/17] kallsyms, x86: Export addresses of syscall trampolines

[Peter Zijlstra]

On Wed, Jun 06, 2018 at 11:02:08AM +0300, Adrian Hunter wrote:
> On 05/06/18 19:00, Andi Kleen wrote:
> >> +#ifdef CONFIG_X86_64
> >> +int arch_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
> >> +		     char *name)
> >> +{
> >> +	unsigned int cpu, ncpu;
> >> +
> >> +	if (symnum >= num_possible_cpus())
> >> +		return -EINVAL;
> >> +
> >> +	for (cpu = cpumask_first(cpu_possible_mask), ncpu = 0;
> >> +	     cpu < num_possible_cpus() && ncpu < symnum;
> >> +	     cpu = cpumask_next(cpu, cpu_possible_mask), ncpu++)
> >> +		;
> > 
> > That is max_t(unsigned, cpumask_last(cpu_possible_mask), symnum)
> 
> I think it should be:
> 
> -	     cpu < num_possible_cpus() && ncpu < symnum;
> +	     ncpu < symnum;

Since we're bike-shedding:

	for_each_possible_cpu(cpu) {
		if (ncpu++ >= symnum)
			break;
	}