lkml.org 
[lkml]   [2011]   [Nov]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] jump_label_inc may return before the code is patched
From
Date
On Wed, 2011-11-02 at 17:21 +0200, Gleb Natapov wrote:
> On Tue, Oct 18, 2011 at 05:06:25PM -0400, Steven Rostedt wrote:
> > On Tue, 2011-10-18 at 19:55 +0200, Gleb Natapov wrote:
> > > If cpu A calls jump_label_inc() just after atomic_add_return() is
> > > called by cpu B, atomic_inc_not_zero() will return value greater then
> > > zero and jump_label_inc() will return to a caller before jump_label_update()
> > > finishes its job on cpu B.
> >
> > OK, I see what you are saying. There's a race here that jump_label_inc
> > may return before jump labels are actually activated. I have no issue
> > with this change. This guarantees that jump labels will be active on
> > return of jump_label_inc().
> >
> > I'm assuming that jump_label_update() does memory barries, as it does
> > modify code, and would be itself a synchronization point.
> >
> > Acked-by: Steven Rostedt <rostedt@goodmis.org>
> >
> So through what tree this should go to Linus' git?

I'll pull it in. I'm currently scrambling around getting back up to
speed after a 11 day conference spree.



-- Steve




\
 
 \ /
  Last update: 2011-11-02 16:45    [from the cache]
©2003-2011 Jasper Spaans