[PATCH v3 6/6] stm class: ftrace: use different channel accroding to CPU

[Tingwei Zhang]

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

Signed-off-by: Tingwei Zhang <ting...@codeaurora.org>
Reviewed-by: Steven Rostedt (VMware) <rost...@goodmis.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");
-- 
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