Linux Kernel Markers: support multiple probes

RCU style multiple probes support for the Linux Kernel Markers.  Common case
(one probe) is still fast and does not require dynamic allocation or a
supplementary pointer dereference on the fast path.

- Move preempt disable from the marker site to the callback.

Since we now have an internal callback, move the preempt disable/enable to the
callback instead of the marker site.

Since the callback change is done asynchronously (passing from a handler that
supports arguments to a handler that does not setup the arguments is no
arguments are passed), we can safely update it even if it is outside the
preempt disable section.

- Move probe arm to probe connection. Now, a connected probe is automatically
  armed.

Remove MARK_MAX_FORMAT_LEN, unused.

This patch modifies the Linux Kernel Markers API : it removes the probe
"arm/disarm" and changes the probe function prototype : it now expects a
va_list * instead of a "...".

If we want to have more than one probe connected to a marker at a given
time (LTTng, or blktrace, ssytemtap) then we need this patch. Without it,
connecting a second probe handler to a marker will fail.

It allow us, for instance, to do interesting combinations :

Do standard tracing with LTTng and, eventually, to compute statistics
with SystemTAP, or to have a special trigger on an event that would call
a systemtap script which would stop flight recorder tracing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Mike Mason <mmlnx@us.ibm.com>
Cc: Dipankar Sarma <dipankar@in.ibm.com>
Cc: David Smith <dsmith@redhat.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/kernel/module.c b/kernel/module.c
index 4202da97a1da..92595bad3812 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -2038,7 +2038,7 @@ static struct module *load_module(void __user *umod,
 #ifdef CONFIG_MARKERS
         if (!mod->taints)
                 marker_update_probe_range(mod->markers,
-                        mod->markers + mod->num_markers, NULL, NULL);
+                        mod->markers + mod->num_markers);
 #endif
         err = module_finalize(hdr, sechdrs, mod);
         if (err < 0)
@@ -2564,7 +2564,7 @@ EXPORT_SYMBOL(struct_module);
 #endif
 
 #ifdef CONFIG_MARKERS
-void module_update_markers(struct module *probe_module, int *refcount)
+void module_update_markers(void)
 {
         struct module *mod;
 
@@ -2572,8 +2572,7 @@ void module_update_markers(struct module *probe_module, int *refcount)
         list_for_each_entry(mod, &modules, list)
                 if (!mod->taints)
                         marker_update_probe_range(mod->markers,
-                                mod->markers + mod->num_markers,
-                                probe_module, refcount);
+                                mod->markers + mod->num_markers);
         mutex_unlock(&module_mutex);
 }
 #endif