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>

1 files changed, 6 insertions, 19 deletions

diff --git a/include/trace/events/printk.h b/include/trace/events/printk.h
index 94ec79cc011a..c008bc99f9fa 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))