tracing: Change tracing_entries_fops to rely on tracing_get_cpu()
authorOleg Nesterov <oleg@redhat.com>
Tue, 23 Jul 2013 15:26:06 +0000 (17:26 +0200)
committerSteven Rostedt <rostedt@rostedt.homelinux.com>
Wed, 24 Jul 2013 15:22:52 +0000 (11:22 -0400)
commit0bc392ee46d0fd8e6b678457ef71f074f19a03c5
treee0f516c200ab6f1eea2f31323c6e4d24000d7e93
parent4d3435b8a4c3357695e09c5e7a3bf73a19fca5b0
tracing: Change tracing_entries_fops to rely on tracing_get_cpu()

tracing_open_generic_tc() is racy, the memory inode->i_private
points to can be already freed.

1. Change its last user, tracing_entries_fops, to use
   tracing_*_generic_tr() instead.

2. Change debugfs_create_file("buffer_size_kb", data) callers
   to pass "data = tr".

3. Change tracing_entries_read() and tracing_entries_write() to
   use tracing_get_cpu().

4. Kill the no longer used tracing_open_generic_tc() and
   tracing_release_generic_tc().

Link: http://lkml.kernel.org/r/20130723152606.GA23730@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
kernel/trace/trace.c