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tracing/mmiotrace: Reset dropped_count in mmio_reset_data()

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mmio_reset_data() is called during tracer initialization, reset, and
start. While it resets overrun_detected and prev_overruns, it neglects
to reset dropped_count. Consequently, dropped event counts from prior
tracing sessions persist in dropped_count and corrupt overrun reports
in subsequent runs.

Fix this by explicitly calling atomic_set(&dropped_count, 0) in
mmio_reset_data().

Link: https://patch.msgid.link/178524299122.56416.16277704230639425172.stgit@devnote2
Fixes: 173ed24ee2 ("mmiotrace: count events lost due to not recording")
Assisted-by: Antigravity:gemini-3.6-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu (Google)
2026-07-28 21:49:51 +09:00
committed by Steven Rostedt
parent f5098b6bae
commit c786d2bdf1
1 changed files with 1 additions and 0 deletions
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1
kernel/trace/trace_mmiotrace.c
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@@ -29,6 +29,7 @@ static void mmio_reset_data(struct trace_array *tr)
{
overrun_detected = false;
prev_overruns = 0;
atomic_set(&dropped_count, 0);
tracing_reset_online_cpus(&tr->array_buffer);
}