From e67efb93f0e9130174293ffaa5975f87b301b531 Mon Sep 17 00:00:00 2001 From: "Steven Rostedt (Red Hat)" Date: Tue, 12 Mar 2013 15:07:59 -0400 Subject: [PATCH] ftrace: Clean up function probe methods When a function probe is created, each function that the probe is attached to, a "callback" method is called. On release of the probe, each function entry calls the "free" method. First, "callback" is a confusing name and does not really match what it does. Callback sounds like it will be called when the probe triggers. But that's not the case. This is really an "init" function, so lets rename it as such. Secondly, both "init" and "free" do not pass enough information back to the handlers. Pass back the ops, ip and data for each time the method is called. We have the information, might as well use it. Signed-off-by: Steven Rostedt --- include/linux/ftrace.h | 6 ++++-- kernel/trace/ftrace.c | 6 +++--- 2 files changed, 7 insertions(+), 5 deletions(-) diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index e5ca8ef..832422d 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -259,8 +259,10 @@ struct ftrace_probe_ops { void (*func)(unsigned long ip, unsigned long parent_ip, void **data); - int (*callback)(unsigned long ip, void **data); - void (*free)(void **data); + int (*init)(struct ftrace_probe_ops *ops, + unsigned long ip, void **data); + void (*free)(struct ftrace_probe_ops *ops, + unsigned long ip, void **data); int (*print)(struct seq_file *m, unsigned long ip, struct ftrace_probe_ops *ops, diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index dab031f..ff0ef41 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2984,7 +2984,7 @@ static void ftrace_free_entry_rcu(struct rcu_head *rhp) container_of(rhp, struct ftrace_func_probe, rcu); if (entry->ops->free) - entry->ops->free(&entry->data); + entry->ops->free(entry->ops, entry->ip, &entry->data); kfree(entry); } @@ -3045,8 +3045,8 @@ register_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops, * for each function we find. We call the callback * to give the caller an opportunity to do so. */ - if (ops->callback) { - if (ops->callback(rec->ip, &entry->data) < 0) { + if (ops->init) { + if (ops->init(ops, rec->ip, &entry->data) < 0) { /* caller does not like this func */ kfree(entry); continue; -- 2.7.4