Re: [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of =

Linus Torvalds
2009-06-09T15:48:44Z

On Tue, 9 Jun 2009, Rusty Russell wrote:
>
> for_each_online_cpu(i) {
> - if (check_supported_cpu(i))
> + if (work_on_cpu(i, check_supported_cpu, NULL) == 0)
> supported_cpus++;

Please STOP USING THAT HORRIBLE "work_on_cpu()" crap.

Is there any reason you do that? We've had to fix up the fallout from that
kind of crazy crap several times.

Just use a regular IPI. Use "smp_call_function_[single|many]()" instead.

See for example commit 01599fca6758d2cd133e78f87426fc851c9ea725, where
another "work_on_cpu()" thing was broken.

I don't understand why you guys keep on using that _known_ bad function.
The whole point of "work_on_cpu()" is for big, slow, and rare things. Not
as a random "let's make that CPU do this".

So stop it.

Linus