linux-kernel - [PATCH 3.10 046/143] tracing: Fix trace_printk() to print when not using bprintk()

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Date:	Sun,  5 Jun 2016 12:19:09 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	stable@...r.kernel.org#v3.5+, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 046/143] tracing: Fix trace_printk() to print when not using bprintk()

From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>

commit 3debb0a9ddb16526de8b456491b7db60114f7b5e upstream.

The trace_printk() code will allocate extra buffers if the compile detects
that a trace_printk() is used. To do this, the format of the trace_printk()
is saved to the __trace_printk_fmt section, and if that section is bigger
than zero, the buffers are allocated (along with a message that this has
happened).

If trace_printk() uses a format that is not a constant, and thus something
not guaranteed to be around when the print happens, the compiler optimizes
the fmt out, as it is not used, and the __trace_printk_fmt section is not
filled. This means the kernel will not allocate the special buffers needed
for the trace_printk() and the trace_printk() will not write anything to the
tracing buffer.

Adding a "__used" to the variable in the __trace_printk_fmt section will
keep it around, even though it is set to NULL. This will keep the string
from being printed in the debugfs/tracing/printk_formats section as it is
not needed.

Reported-by: Vlastimil Babka <vbabka@...e.cz>
Fixes: 07d777fe8c398 "tracing: Add percpu buffers for trace_printk()"
Cc: stable@...r.kernel.org # v3.5+
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 include/linux/kernel.h      | 6 +++---
 kernel/trace/trace_printk.c | 3 +++
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 341551c..5f4554b 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -557,7 +557,7 @@ do {							\
 
 #define do_trace_printk(fmt, args...)					\
 do {									\
-	static const char *trace_printk_fmt				\
+	static const char *trace_printk_fmt __used			\
 		__attribute__((section("__trace_printk_fmt"))) =	\
 		__builtin_constant_p(fmt) ? fmt : NULL;			\
 									\
@@ -604,7 +604,7 @@ extern int __trace_puts(unsigned long ip, const char *str, int size);
  */
 
 #define trace_puts(str) ({						\
-	static const char *trace_printk_fmt				\
+	static const char *trace_printk_fmt __used			\
 		__attribute__((section("__trace_printk_fmt"))) =	\
 		__builtin_constant_p(str) ? str : NULL;			\
 									\
@@ -624,7 +624,7 @@ extern void trace_dump_stack(int skip);
 #define ftrace_vprintk(fmt, vargs)					\
 do {									\
 	if (__builtin_constant_p(fmt)) {				\
-		static const char *trace_printk_fmt			\
+		static const char *trace_printk_fmt __used		\
 		  __attribute__((section("__trace_printk_fmt"))) =	\
 			__builtin_constant_p(fmt) ? fmt : NULL;		\
 									\
diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
index a9077c1..fdb23e8 100644
--- a/kernel/trace/trace_printk.c
+++ b/kernel/trace/trace_printk.c
@@ -272,6 +272,9 @@ static int t_show(struct seq_file *m, void *v)
 	const char *str = *fmt;
 	int i;
 
+	if (!*fmt)
+		return 0;
+
 	seq_printf(m, "0x%lx : \"", *(unsigned long *)fmt);
 
 	/*
-- 
2.8.0.rc2.1.gbe9624a