From 07c65f4d1aa74f7cf1c46d7f96e05cfa3e628ba1 Mon Sep 17 00:00:00 2001
From: "zhangwei(Jovi)" <jovi.zhangwei@huawei.com>
Date: Mon, 29 Apr 2013 16:17:16 -0700
Subject: [PATCH] printk/tracing: rework console tracing
Commit 7ff9554bb578 ("printk: convert byte-buffer to variable-length
record buffer") removed start and end parameters from
call_console_drivers, but those parameters still exist in
include/trace/events/printk.h.
Without start and end parameters handling, printk tracing became more
simple as: trace_console(text, len);
Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Kay Sievers <kay@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
include/trace/events/printk.h | 25 ++++++-------------------
kernel/printk.c | 2 +-
2 files changed, 7 insertions(+), 20 deletions(-)
diff --git a/include/trace/events/printk.h b/include/trace/events/printk.h
index 94ec79cc011ae..c008bc99f9fa9 100644
--- a/include/trace/events/printk.h
+++ b/include/trace/events/printk.h
@@ -6,31 +6,18 @@
#include <linux/tracepoint.h>
-TRACE_EVENT_CONDITION(console,
- TP_PROTO(const char *log_buf, unsigned start, unsigned end,
- unsigned log_buf_len),
+TRACE_EVENT(console,
+ TP_PROTO(const char *text, size_t len),
- TP_ARGS(log_buf, start, end, log_buf_len),
-
- TP_CONDITION(start != end),
+ TP_ARGS(text, len),
TP_STRUCT__entry(
- __dynamic_array(char, msg, end - start + 1)
+ __dynamic_array(char, msg, len + 1)
),
TP_fast_assign(
- if ((start & (log_buf_len - 1)) > (end & (log_buf_len - 1))) {
- memcpy(__get_dynamic_array(msg),
- log_buf + (start & (log_buf_len - 1)),
- log_buf_len - (start & (log_buf_len - 1)));
- memcpy((char *)__get_dynamic_array(msg) +
- log_buf_len - (start & (log_buf_len - 1)),
- log_buf, end & (log_buf_len - 1));
- } else
- memcpy(__get_dynamic_array(msg),
- log_buf + (start & (log_buf_len - 1)),
- end - start);
- ((char *)__get_dynamic_array(msg))[end - start] = 0;
+ memcpy(__get_dynamic_array(msg), text, len);
+ ((char *)__get_dynamic_array(msg))[len] = 0;
),
TP_printk("%s", __get_str(msg))
diff --git a/kernel/printk.c b/kernel/printk.c
index abbdd9e2ac82c..2de593df036b9 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1265,7 +1265,7 @@ static void call_console_drivers(int level, const char *text, size_t len)
{
struct console *con;
- trace_console(text, 0, len, len);
+ trace_console(text, len);
if (level >= console_loglevel && !ignore_loglevel)
return;
--
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