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[media] v4l2: move tracepoint generation into separate file

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To compile videobuf2-core as a module, the vb2_* tracepoints must be
exported from the videodev module. Instead of exporting vb2 tracepoint
symbols from v4l2-ioctl.c, move the tracepoint generation into a separate
file. This patch fixes the following build error in the modpost stage,
introduced by 2091f5181c66 ("[media] videobuf2: add trace events"):

    ERROR: "__tracepoint_vb2_buf_done" undefined!
    ERROR: "__tracepoint_vb2_dqbuf" undefined!
    ERROR: "__tracepoint_vb2_qbuf" undefined!
    ERROR: "__tracepoint_vb2_buf_queue" undefined!

Suggested-by: Steven Rostedt <rostedt@goodmis.org>

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Philipp Zabel 2015-08-06 09:38:02 -03:00 committed by Mauro Carvalho Chehab
parent b1304f9bdc
commit 9deb6ad661
3 changed files with 14 additions and 1 deletions
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3
drivers/media/v4l2-core/Makefile
View File

@ -13,6 +13,9 @@ endif
ifeq ($(CONFIG_OF),y)
videodev-objs += v4l2-of.o
endif
ifeq ($(CONFIG_TRACEPOINTS),y)
videodev-objs += v4l2-trace.o
endif
obj-$(CONFIG_VIDEO_V4L2) += videodev.o
obj-$(CONFIG_VIDEO_V4L2) += v4l2-common.o

1
drivers/media/v4l2-core/v4l2-ioctl.c
View File

@ -28,7 +28,6 @@
#include <media/v4l2-device.h>
#include <media/videobuf2-core.h>
#define CREATE_TRACE_POINTS
#include <trace/events/v4l2.h>
/* Zero out the end of the struct pointed to by p. Everything after, but

11
drivers/media/v4l2-core/v4l2-trace.c Normal file
View File

@ -0,0 +1,11 @@
#include <media/v4l2-common.h>
#include <media/v4l2-fh.h>
#include <media/videobuf2-core.h>
#define CREATE_TRACE_POINTS
#include <trace/events/v4l2.h>
EXPORT_TRACEPOINT_SYMBOL_GPL(vb2_buf_done);
EXPORT_TRACEPOINT_SYMBOL_GPL(vb2_buf_queue);
EXPORT_TRACEPOINT_SYMBOL_GPL(vb2_dqbuf);
EXPORT_TRACEPOINT_SYMBOL_GPL(vb2_qbuf);