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FROMLIST: stm class: ftrace: use different channel accroding to CPU

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

Bug: 160464759
Link: https://lore.kernel.org/patchwork/cover/1280618/
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Change-Id: I5e0afe8e6fb60f73c4ce3165b80db38e60f82031
This commit is contained in:
Tingwei Zhang
2020-07-18 14:39:53 +08:00
committed by Todd Kjos
parent 651e59845c
commit 344b01778e
1 changed files with 4 additions and 1 deletions
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drivers/hwtracing/stm/ftrace.c
+4 -1
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@@ -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");