tracing/boottime: Fix kprobe event API usage
authorMasami Hiramatsu <mhiramat@kernel.org>
Sat, 25 Apr 2020 05:49:17 +0000 (14:49 +0900)
committerSteven Rostedt (VMware) <rostedt@goodmis.org>
Wed, 6 May 2020 13:04:11 +0000 (09:04 -0400)
commitda0f1f4167e3af69e1d8b32d6d65195ddd2bfb64
tree3f3004ade391b9d890c55ab35942a949eb5471ed
parentdcbd21c9fca5e954fd4e3d91884907eb6d47187e
tracing/boottime: Fix kprobe event API usage

Fix boottime kprobe events to use API correctly for
multiple events.

For example, when we set a multiprobe kprobe events in
bootconfig like below,

  ftrace.event.kprobes.myevent {
   probes = "vfs_read $arg1 $arg2", "vfs_write $arg1 $arg2"
  }

This cause an error;

  trace_boot: Failed to add probe: p:kprobes/myevent (null)  vfs_read $arg1 $arg2  vfs_write $arg1 $arg2

This shows the 1st argument becomes NULL and multiprobes
are merged to 1 probe.

Link: http://lkml.kernel.org/r/158779375766.6082.201939936008972838.stgit@devnote2
Cc: Ingo Molnar <mingo@kernel.org>
Cc: stable@vger.kernel.org
Fixes: 29a154810546 ("tracing: Change trace_boot to use kprobe_event interface")
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
kernel/trace/trace_boot.c