stm class: ftrace: Use different channel accroding to CPU (b8f8534b) · Commits · 戴 / test

To avoid mixup of packets from differnt ftrace packets simultaneously, use different channel for packets from different CPU. Reviewed-by:

drivers/hwtracing/stm/ftrace.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -37,8 +37,10 @@ static void notrace
		stm_ftrace_write(struct trace_export export, const void buf, unsigned int len)
		{
		struct stm_ftrace *stm = container_of(export, struct stm_ftrace, ftrace);
		/* This is called from trace system with preemption disabled */
		unsigned int cpu = smp_processor_id();

		stm_source_write(&stm->data, STM_FTRACE_CHAN, buf, len);
		stm_source_write(&stm->data, STM_FTRACE_CHAN + cpu, buf, len);
		}

		static int stm_ftrace_link(struct stm_source_data *data)
		@@ -63,6 +65,7 @@ static int __init stm_ftrace_init(void)
		{
		int ret;

		stm_ftrace.data.nr_chans = roundup_pow_of_two(num_possible_cpus());
		ret = stm_source_register_device(NULL, &stm_ftrace.data);
		if (ret)
		pr_err("Failed to register stm_source - ftrace.\n");