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USB: mtu3: tracing: Use the new __vstring() helper

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Instead of open coding a __dynamic_array() with a fixed length (which
defeats the purpose of the dynamic array in the first place). Use the new
__vstring() helper that will use a va_list and only write enough of the
string into the ring buffer that is needed.

Link: https://lkml.kernel.org/r/20220719112719.17e796c6@gandalf.local.home

Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-usb@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-mediatek@lists.infradead.org
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Tested-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Google) 2022-07-19 11:27:19 -04:00
parent f71f3ba9b4
commit 730dbb8dda
1 changed files with 2 additions and 4 deletions
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6
drivers/usb/mtu3/mtu3_trace.h
View File

@ -18,18 +18,16 @@
#include "mtu3.h"
#define MTU3_MSG_MAX 256
TRACE_EVENT(mtu3_log,
TP_PROTO(struct device *dev, struct va_format *vaf),
TP_ARGS(dev, vaf),
TP_STRUCT__entry(
__string(name, dev_name(dev))
__dynamic_array(char, msg, MTU3_MSG_MAX)
__vstring(msg, vaf->fmt, vaf->va)
),
TP_fast_assign(
__assign_str(name, dev_name(dev));
vsnprintf(__get_str(msg), MTU3_MSG_MAX, vaf->fmt, *vaf->va);
__assign_vstr(msg, vaf->fmt, vaf->va);
),
TP_printk("%s: %s", __get_str(name), __get_str(msg))
);