[lkml]   [2010]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] lockdep: Make lockstats counting per cpu
On Fri, 2010-03-26 at 07:52 +0100, Peter Zijlstra wrote:
> On Fri, 2010-03-26 at 03:22 +0100, Frederic Weisbecker wrote:
> > We can't use irqsafe per cpu counters for that as
> > these stats might be also written from NMI path, and irqsafe per
> > cpu counters are not NMI safe, but local_t operations are.
> >
> lockdep shouldn't do NMI, nmi_enter() has an explicit lockdep_off().

Also, more importantly, you simply should never use locks in NMI context
to begin with ;-)

 \ /
  Last update: 2010-03-26 08:51    [W:0.059 / U:2.352 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site