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>

diff --git a/include/trace/events/printk.h b/include/trace/events/printk.h
index 94ec79c..c008bc9 100644 (file)
--- 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 abbdd9e..2de593d 100644 (file)
--- 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;