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Merge branch 'trace/ftrace/urgent' into trace/ftrace/core

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Needed 099ed15167 "tracing: Remove ftrace_stop/start() from
 reading the trace file" for the removal of ftrace_start/stop().
This commit is contained in:
Steven Rostedt (Red Hat) 2014-07-09 11:02:34 -04:00 committed by Steven Rostedt
commit ca65ef1ab6
3 changed files with 30 additions and 24 deletions
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6
kernel/events/uprobes.c
View file

@ -846,7 +846,7 @@ static void __uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *u
{
int err;
if (!consumer_del(uprobe, uc)) /* WARN? */
if (WARN_ON(!consumer_del(uprobe, uc)))
return;
err = register_for_each_vma(uprobe, NULL);
@ -927,7 +927,7 @@ int uprobe_apply(struct inode *inode, loff_t offset,
int ret = -ENOENT;
uprobe = find_uprobe(inode, offset);
if (!uprobe)
if (WARN_ON(!uprobe))
return ret;
down_write(&uprobe->register_rwsem);
@ -952,7 +952,7 @@ void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consume
struct uprobe *uprobe;
uprobe = find_uprobe(inode, offset);
if (!uprobe)
if (WARN_ON(!uprobe))
return;
down_write(&uprobe->register_rwsem);

2
kernel/trace/trace.c
View file

@ -1372,7 +1372,6 @@ void tracing_start(void)
arch_spin_unlock(&global_trace.max_lock);
ftrace_start();
out:
raw_spin_unlock_irqrestore(&global_trace.start_lock, flags);
}
@ -1419,7 +1418,6 @@ void tracing_stop(void)
struct ring_buffer *buffer;
unsigned long flags;
ftrace_stop();
raw_spin_lock_irqsave(&global_trace.start_lock, flags);
if (global_trace.stop_count++)
goto out;

46
kernel/trace/trace_uprobe.c
View file

@ -893,6 +893,9 @@ probe_event_enable(struct trace_uprobe *tu, struct ftrace_event_file *file,
int ret;
if (file) {
if (tu->tp.flags & TP_FLAG_PROFILE)
return -EINTR;
link = kmalloc(sizeof(*link), GFP_KERNEL);
if (!link)
return -ENOMEM;
@ -901,29 +904,40 @@ probe_event_enable(struct trace_uprobe *tu, struct ftrace_event_file *file,
list_add_tail_rcu(&link->list, &tu->tp.files);
tu->tp.flags |= TP_FLAG_TRACE;
} else
tu->tp.flags |= TP_FLAG_PROFILE;
} else {
if (tu->tp.flags & TP_FLAG_TRACE)
return -EINTR;
ret = uprobe_buffer_enable();
if (ret < 0)
return ret;
tu->tp.flags |= TP_FLAG_PROFILE;
}
WARN_ON(!uprobe_filter_is_empty(&tu->filter));
if (enabled)
return 0;
ret = uprobe_buffer_enable();
if (ret)
goto err_flags;
tu->consumer.filter = filter;
ret = uprobe_register(tu->inode, tu->offset, &tu->consumer);
if (ret) {
if (file) {
list_del(&link->list);
kfree(link);
tu->tp.flags &= ~TP_FLAG_TRACE;
} else
tu->tp.flags &= ~TP_FLAG_PROFILE;
}
if (ret)
goto err_buffer;
return 0;
err_buffer:
uprobe_buffer_disable();
err_flags:
if (file) {
list_del(&link->list);
kfree(link);
tu->tp.flags &= ~TP_FLAG_TRACE;
} else {
tu->tp.flags &= ~TP_FLAG_PROFILE;
}
return ret;
}
@ -1201,12 +1215,6 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
current->utask->vaddr = (unsigned long) &udd;
#ifdef CONFIG_PERF_EVENTS
if ((tu->tp.flags & TP_FLAG_TRACE) == 0 &&
!uprobe_perf_filter(&tu->consumer, 0, current->mm))
return UPROBE_HANDLER_REMOVE;
#endif
if (WARN_ON_ONCE(!uprobe_cpu_buffer))
return 0;