linux-kernel - [PATCH -tip v3 10/23] ftrace/kprobes: Allow probing on some preparation functions

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Date:	Wed, 20 Nov 2013 04:22:13 +0000
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-arch@...r.kernel.org,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Frederic Weisbecker <fweisbec@...il.com>, x86@...nel.org,
	lkml <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	virtualization@...ts.linux-foundation.org,
	Ingo Molnar <mingo@...hat.com>, systemtap@...rceware.org,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH -tip v3 10/23] ftrace/kprobes: Allow probing on some
 preparation functions

There is no need to prohibit probing on the functions
used for preparation. Those are safely probed because
those are not invoked from breakpoint/fault/debug handlers,
there is no chance to cause recursive exceptions.

Following functions are now removed from the kprobes blacklist.
update_bitfield_fetch_param
free_bitfield_fetch_param
kprobe_register

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
---
 kernel/trace/trace_kprobe.c |    2 +-
 kernel/trace/trace_probe.c  |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 243f683..e0132b4 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1151,7 +1151,7 @@ kretprobe_perf_func(struct trace_probe *tp, struct kretprobe_instance *ri,
  * kprobe_trace_self_tests_init() does enable_trace_probe/disable_trace_probe
  * lockless, but we can't race with this __init function.
  */
-static __kprobes
+static
 int kprobe_register(struct ftrace_event_call *event,
 		    enum trace_reg type, void *data)
 {
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 412e959..43638a2 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -346,7 +346,7 @@ DEFINE_BASIC_FETCH_FUNCS(bitfield)
 #define fetch_bitfield_string		NULL
 #define fetch_bitfield_string_size	NULL
 
-static __kprobes void
+static void
 update_bitfield_fetch_param(struct bitfield_fetch_param *data)
 {
 	/*
@@ -359,7 +359,7 @@ update_bitfield_fetch_param(struct bitfield_fetch_param *data)
 		update_symbol_cache(data->orig.data);
 }
 
-static __kprobes void
+static void
 free_bitfield_fetch_param(struct bitfield_fetch_param *data)
 {
 	/*


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