Commit 9dfed80d authored by Chunyan Zhang's avatar Chunyan Zhang Committed by Steven Rostedt
Browse files

stm: Mark the functions of writing STM with notrace 

If CONFIG_STM_SOURCE_FTRACE is selected, Function trace data can be
writen to sink via STM, all functions that related to writing data
packets to STM should be marked 'notrace' to avoid being traced by
Ftrace, otherwise the program would stall into an endless loop.

Link: http://lkml.kernel.org/r/1479715043-6534-7-git-send-email-zhang.chunyan@linaro.org



Signed-off-by: default avatarChunyan Zhang <zhang.chunyan@linaro.org>
Acked-by: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 9b5e3ff6

drivers/hwtracing/stm/core.c

+4 −3
Original line number Diff line number Diff line
@@ -425,7 +425,7 @@ static int stm_file_assign(struct stm_file *stmf, char *id, unsigned int width) 
	return ret;

}



static ssize_t stm_write(struct stm_data *data, unsigned int master,

static ssize_t notrace stm_write(struct stm_data *data, unsigned int master,

			  unsigned int channel, const char *buf, size_t count)

{

	unsigned int flags = STP_PACKET_TIMESTAMPED;
@@ -1121,7 +1121,8 @@ void stm_source_unregister_device(struct stm_source_data *data) 
}

EXPORT_SYMBOL_GPL(stm_source_unregister_device);



int stm_source_write(struct stm_source_data *data, unsigned int chan,

int notrace stm_source_write(struct stm_source_data *data,

			     unsigned int chan,

			     const char *buf, size_t count)

{

	struct stm_source_device *src = data->src;

include/linux/stm.h

+2 −2
Original line number Diff line number Diff line
@@ -133,7 +133,7 @@ int stm_source_register_device(struct device *parent, 
			       struct stm_source_data *data);

void stm_source_unregister_device(struct stm_source_data *data);



int stm_source_write(struct stm_source_data *data, unsigned int chan,

int notrace stm_source_write(struct stm_source_data *data, unsigned int chan,

			     const char *buf, size_t count);



#endif /* _STM_H_ */

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