linux-kernel - [PATCH 07/13] xhci: tracing: Use the new _

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Message-ID: <20220705224750.172301548@goodmis.org>
Date:   Tue, 05 Jul 2022 18:45:00 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: [PATCH 07/13] xhci: tracing: Use the new __vstring() helper

From: "Steven Rostedt (Google)" <rostedt@...dmis.org>

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.

Cc: Mathias Nyman <mathias.nyman@...el.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 drivers/usb/host/xhci-trace.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/xhci-trace.h b/drivers/usb/host/xhci-trace.h
index a5da02077297..61e93a3540a7 100644
--- a/drivers/usb/host/xhci-trace.h
+++ b/drivers/usb/host/xhci-trace.h
@@ -28,9 +28,9 @@
 DECLARE_EVENT_CLASS(xhci_log_msg,
 	TP_PROTO(struct va_format *vaf),
 	TP_ARGS(vaf),
-	TP_STRUCT__entry(__dynamic_array(char, msg, XHCI_MSG_MAX)),
+	TP_STRUCT__entry(__vstring(msg, vaf->fmt, vaf->va)),
 	TP_fast_assign(
-		vsnprintf(__get_str(msg), XHCI_MSG_MAX, vaf->fmt, *vaf->va);
+		__assign_vstr(msg, vaf->fmt, vaf->va);
 	),
 	TP_printk("%s", __get_str(msg))
 );
-- 
2.35.1