linux-kernel - [PATCH 08/12] tracing: declare __trace_bprintk_fmt/__tracepoint

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Message-Id: <20161016151616.31451-9-vegard.nossum@oracle.com>
Date:   Sun, 16 Oct 2016 17:16:12 +0200
From:   Vegard Nossum <vegard.nossum@...cle.com>
To:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jiri Slaby <jslaby@...e.cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCH 08/12] tracing: declare __trace_bprintk_fmt/__tracepoint_str as external arrays

Cc: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Vegard Nossum <vegard.nossum@...cle.com>
---
 kernel/trace/trace.c        | 2 +-
 kernel/trace/trace.h        | 7 +++----
 kernel/trace/trace_printk.c | 8 ++++----
 3 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d1bee81..50af466 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -7642,7 +7642,7 @@ __init static int tracer_alloc_buffers(void)
 		goto out_free_buffer_mask;
 
 	/* Only allocate trace_printk buffers if a trace_printk exists */
-	if (__stop___trace_bprintk_fmt != __start___trace_bprintk_fmt)
+	if (ext_size(__trace_bprintk_fmt))
 		/* Must be called before global_trace.buffer is allocated */
 		trace_printk_init_buffers();
 
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index fd24b1f..75d2750 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -2,6 +2,7 @@
 #ifndef _LINUX_KERNEL_TRACE_H
 #define _LINUX_KERNEL_TRACE_H
 
+#include <linux/extarray.h>
 #include <linux/fs.h>
 #include <linux/atomic.h>
 #include <linux/sched.h>
@@ -1605,11 +1606,9 @@ extern int trace_event_enable_disable(struct trace_event_file *file,
 				      int enable, int soft_disable);
 extern int tracing_alloc_snapshot(void);
 
-extern const char *__start___trace_bprintk_fmt[];
-extern const char *__stop___trace_bprintk_fmt[];
+DECLARE_EXTARRAY(const char *, __trace_bprintk_fmt);
 
-extern const char *__start___tracepoint_str[];
-extern const char *__stop___tracepoint_str[];
+DECLARE_EXTARRAY(const char *, __tracepoint_str);
 
 void trace_printk_control(bool enabled);
 void trace_printk_init_buffers(void);
diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c
index ad1d6164..0d66509 100644
--- a/kernel/trace/trace_printk.c
+++ b/kernel/trace/trace_printk.c
@@ -255,10 +255,10 @@ static const char **find_next(void *v, loff_t *pos)
 	int start_index;
 	int last_index;
 
-	start_index = __stop___trace_bprintk_fmt - __start___trace_bprintk_fmt;
+	start_index = ext_size(__trace_bprintk_fmt);
 
 	if (*pos < start_index)
-		return __start___trace_bprintk_fmt + *pos;
+		return ext_start(__trace_bprintk_fmt) + *pos;
 
 	/*
 	 * The __tracepoint_str section is treated the same as the
@@ -273,10 +273,10 @@ static const char **find_next(void *v, loff_t *pos)
 	 * the ASCII text for userspace.
 	 */
 	last_index = start_index;
-	start_index = __stop___tracepoint_str - __start___tracepoint_str;
+	start_index = ext_size(__tracepoint_str);
 
 	if (*pos < last_index + start_index)
-		return __start___tracepoint_str + (*pos - last_index);
+		return ext_start(__tracepoint_str) + (*pos - last_index);
 
 	start_index += last_index;
 	return find_next_mod_format(start_index, v, fmt, pos);
-- 
2.10.0.479.g221bd91