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| author |   Romain Izard <romain.izard.pro@gmail.com> | 2014-03-04 10:09:39 +0100 |
|---|---|---|
| committer |   Steven Rostedt <rostedt@goodmis.org> | 2014-05-08 07:05:18 -0400 |
| commit | 098507ae3ec2331476fb52e85d4040c1cc6d0ef4 (patch) | |
| tree | 042a286bccbfa39e0db97d36fe9fd4a3ffeae64e /include/trace/events/module.h | |
| parent | tracing: Use rcu_dereference_sched() for trace event triggers (diff) | |
| download | linux-dev-098507ae3ec2331476fb52e85d4040c1cc6d0ef4.tar.xz linux-dev-098507ae3ec2331476fb52e85d4040c1cc6d0ef4.zip | |
trace: module: Maintain a valid user count
The replacement of the 'count' variable by two variables 'incs' and
'decs' to resolve some race conditions during module unloading was done
in parallel with some cleanup in the trace subsystem, and was integrated
as a merge.
Unfortunately, the formula for this replacement was wrong in the tracing
code, and the refcount in the traces was not usable as a result.
Use 'count = incs - decs' to compute the user count.
Link: http://lkml.kernel.org/p/1393924179-9147-1-git-send-email-romain.izard.pro@gmail.com
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: stable@vger.kernel.org # 2.6.35
Fixes: c1ab9cab7509 "merge conflict resolution"
Signed-off-by: Romain Izard <romain.izard.pro@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to '')
| -rw-r--r-- | include/trace/events/module.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/trace/events/module.h b/include/trace/events/module.h index 11fd51b413de..daa60c739456 100644 --- a/include/trace/events/module.h +++ b/include/trace/events/module.h @@ -80,7 +80,7 @@ DECLARE_EVENT_CLASS(module_refcnt, TP_fast_assign( __entry->ip = ip; - __entry->refcnt = __this_cpu_read(mod->refptr->incs) + __this_cpu_read(mod->refptr->decs); + __entry->refcnt = __this_cpu_read(mod->refptr->incs) - __this_cpu_read(mod->refptr->decs); __assign_str(name, mod->name); ), |