This is a note to let you know that I've just added the patch titled
trace: module: Maintain a valid user count
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
trace-module-maintain-a-valid-user-count.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 098507ae3ec2331476fb52e85d4040c1cc6d0ef4 Mon Sep 17 00:00:00 2001
From: Romain Izard <romain.izard.pro@xxxxxxxxx>
Date: Tue, 4 Mar 2014 10:09:39 +0100
Subject: trace: module: Maintain a valid user count
From: Romain Izard <romain.izard.pro@xxxxxxxxx>
commit 098507ae3ec2331476fb52e85d4040c1cc6d0ef4 upstream.
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@xxxxxxxxx
Acked-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Fixes: c1ab9cab7509 "merge conflict resolution"
Signed-off-by: Romain Izard <romain.izard.pro@xxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
include/trace/events/module.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/trace/events/module.h
+++ b/include/trace/events/module.h
@@ -78,7 +78,7 @@ 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);
),
Patches currently in stable-queue which might be from romain.izard.pro@xxxxxxxxx are
queue-3.4/trace-module-maintain-a-valid-user-count.patch
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