lkml.org 
[lkml]   [2016]   [Nov]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [BUG] msr-trace.h:42 suspicious rcu_dereference_check() usage!
On Wed, Nov 30, 2016 at 09:54:58AM +0100, Thomas Gleixner wrote:
> Right, that's the safe bet. But I'm quite sure that the C1E crap only
> starts to work _after_ ACPI initialization.

Yap, I think it is an ACPI decision whether to enter C1E or not. And all
those boxes which are unaffected - they actually are but since the FW
doesn't enter C1E, they don't hit the bug.

> tick_force_broadcast() is irreversible

So if I let the cores in that small window use amd_e400_idle() and
then when I detect the machine doesn't enter C1E after all, I do
tick_broadcast_exit() on all cores in amd_e400_c1e_mask, then clear it
and free it, that would work?

Or do you see a better solution?

Thanks.

--
Regards/Gruss,
Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

\
 
 \ /
  Last update: 2016-11-30 10:10    [W:0.136 / U:0.324 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site