linux-kernel - [PATCH] ftrace: Add initialization check in trace

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Message-Id: <1376300045-3956-1-git-send-email-jolsa@redhat.com>
Date:	Mon, 12 Aug 2013 11:34:05 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: [PATCH] ftrace: Add initialization check in trace_printk for *puts paths

Adding initialization check in trace_printk for *puts
paths, plus unifying the check for all related cases.

Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
---
 kernel/trace/trace.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 882ec1d..cb7cf96 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -126,6 +126,9 @@ static char *default_bootup_tracer;
 
 static bool allocate_snapshot;
 
+#define TRACE_PRINTK_DENIED \
+	unlikely(tracing_selftest_running || tracing_disabled)
+
 static int __init set_cmdline_ftrace(char *str)
 {
 	strlcpy(bootup_tracer_buf, str, MAX_TRACER_SIZE);
@@ -430,6 +433,9 @@ int __trace_puts(unsigned long ip, const char *str, int size)
 	unsigned long irq_flags;
 	int alloc;
 
+	if (TRACE_PRINTK_DENIED)
+		return 0;
+
 	alloc = sizeof(*entry) + size + 2; /* possible \n added */
 
 	local_save_flags(irq_flags);
@@ -470,6 +476,9 @@ int __trace_bputs(unsigned long ip, const char *str)
 	unsigned long irq_flags;
 	int size = sizeof(struct bputs_entry);
 
+	if (TRACE_PRINTK_DENIED)
+		return 0;
+
 	local_save_flags(irq_flags);
 	buffer = global_trace.trace_buffer.buffer;
 	event = trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size,
@@ -1757,7 +1766,7 @@ void trace_dump_stack(int skip)
 {
 	unsigned long flags;
 
-	if (tracing_disabled || tracing_selftest_running)
+	if (TRACE_PRINTK_DENIED)
 		return;
 
 	local_save_flags(flags);
@@ -1976,7 +1985,7 @@ int trace_vbprintk(unsigned long ip, const char *fmt, va_list args)
 	char *tbuffer;
 	int len = 0, size, pc;
 
-	if (unlikely(tracing_selftest_running || tracing_disabled))
+	if (TRACE_PRINTK_DENIED)
 		return 0;
 
 	/* Don't pollute graph traces with trace_vprintk internals */
@@ -2032,7 +2041,7 @@ __trace_array_vprintk(struct ring_buffer *buffer,
 	unsigned long flags;
 	char *tbuffer;
 
-	if (tracing_disabled || tracing_selftest_running)
+	if (TRACE_PRINTK_DENIED)
 		return 0;
 
 	/* Don't pollute graph traces with trace_vprintk internals */
-- 
1.7.11.7

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