linux-kernel - [PATCH] spi: export tracepoint symbols to modules

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Message-Id: <20190321124240.901884-1-arnd@arndb.de>
Date:   Thu, 21 Mar 2019 13:42:25 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Mark Brown <broonie@...nel.org>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, Arnd Bergmann <arnd@...db.de>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] spi: export tracepoint symbols to modules

The newly added tracepoints in the spi-mxs driver cause a link
error when the driver is a loadable module:

ERROR: "__tracepoint_spi_transfer_stop" [drivers/spi/spi-mxs.ko] undefined!
ERROR: "__tracepoint_spi_transfer_start" [drivers/spi/spi-mxs.ko] undefined!

I'm not quite sure where to put the export statements, but
directly after the inclusion of the header seems as good as
any other place.

Fixes: f3fdea3af405 ("spi: mxs: add tracing to custom .transfer_one_message callback")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/spi/spi.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 93986f879b09..e5d38152888a 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -36,6 +36,8 @@
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/spi.h>
+EXPORT_TRACEPOINT_SYMBOL(spi_transfer_start);
+EXPORT_TRACEPOINT_SYMBOL(spi_transfer_stop);
 
 #include "internals.h"
 
-- 
2.20.0