Re: [PATCH] DevFS support for /dev/cpu/X/(cpuid|msr)

H. Peter Anvin
2002-01-06T21:09:31Z

Matt Dainty wrote:

> Okey dokey,
>
> Please find attached a second, better patch to add devfs support to the i386
> cpuid and msr drivers. Now it doesn't nuke the cpu/X directories on
> unloading and only enumerates CPUs based on smp_num_cpus instead of NR_CPUS.
>

If you don't understand why this is idiotic, then let me enlighten you:
there is no sensible reason why /dev/cpu/%d should only be populated
after having run a CPU-dependent device driver. /dev/cpu/%d should be
always populated; heck, that's the only way you can sensibly handle
hotswapping CPUs.

I WILL NOT accept a patch as long as devfs is as fucked in the head as
it currently is. Unfortunately, that seems like it will be a long long
time.

-hpa