lkml.org 
[lkml]   [2007]   [May]   [12]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateSat, 12 May 2007 13:11:34 -0700 (PDT)
FromLinus Torvalds <>
SubjectRe: [RFD] Freezing of kernel threads

On Sat, 12 May 2007, Linus Torvalds wrote:
> 
>  - make the rule be that you cannot sleep in the above macro, and make the 
>    rule be that CPU hotplug uses the same mechanisms that module unload 
>    already does!

Side note: we obviously already do the stop_machine_run thing for CPU 
down, so doing it for CPU bringup too would seem to just be a good thing. 
And it means that the locking for CPU's disappearing is the same as the 
locking rules for CPU's appearing: you just want to make sure to disable 
preemption (which you already have to do, to make the "CPU went away" case 
work out).

So how about just making sure "__cpu_up()" gets called with the same 
stop_machine_run() logic? Maybe it's not *quite* a one-liner change, but 
it should come fairly close...

		Linus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-05-12 22:15    [from the cache]
©2003-2008