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Date: Thu, 3 Sep 2020 08:17:06 +0800 From: Tingwei Zhang <tingwei@...eaurora.org> To: Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...hat.com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...com> Cc: Tingwei Zhang <tingwei@...eaurora.org>, Mathieu Poirier <mathieu.poirier@...aro.org>, Suzuki K Poulose <suzuki.poulose@....com>, tsoni@...eaurora.org, Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>, Mao Jinlong <jinlmao@...eaurora.org>, linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, linux-arm-kernel@...ts.infradead.org Subject: [PATCH v3 6/6] stm class: ftrace: use different channel accroding to CPU To avoid mixup of packets from differnt ftrace packets simultaneously, use different channel for packets from different CPU. Signed-off-by: Tingwei Zhang <tingwei@...eaurora.org> Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org> --- drivers/hwtracing/stm/ftrace.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/stm/ftrace.c b/drivers/hwtracing/stm/ftrace.c index c694a6e692d1..ebf29489919c 100644 --- a/drivers/hwtracing/stm/ftrace.c +++ b/drivers/hwtracing/stm/ftrace.c @@ -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 = num_possible_cpus(); ret = stm_source_register_device(NULL, &stm_ftrace.data); if (ret) pr_err("Failed to register stm_source - ftrace.\n"); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
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