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a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785242995; bh=B+SkAkO+DZpWHcOFED85ZibUv6VMCkE6Esgv84zpzV8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=BNxlql1ELMjCLY4whD2NKFfCbGuDKemzT62mPnVi5XEqXNas5wz1utgRcGawRGH9f IS67grzadIMGA8QGyHR5vbgGOJ0ABa8HHBUUQ66T4DdyK/66RZ0BhRd6vbDiPlJiNk 6B0UTXgPTpyhojhJdyp1bY2eESwIxRx5nu5TLz8sTYOXo3KUlrk1W9wPsubn+XIQKc RXHKKUzJ5ZxqPkenxNO4SnLrd48GN/pdExaasXADgCl+LdKTXfW/8YESvt18nuMO7g goi64TgtY8KiTnBqRYDWG29PbLfapmW19LM8jn76veAr/5TsRtxLL4PjN042wrZEJ/ whkFYOpgUx1Rw== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Masami Hiramatsu Subject: [PATCH 1/4] tracing/mmiotrace: Reset dropped_count in mmio_reset_data() Date: Tue, 28 Jul 2026 21:49:51 +0900 Message-ID: <178524299122.56416.16277704230639425172.stgit@devnote2> X-Mailer: git-send-email 2.43.0 In-Reply-To: <178524298182.56416.7520852015178187644.stgit@devnote2> References: <178524298182.56416.7520852015178187644.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-ID-Hash: DQX32TEKJMYGEOKHBJILVHP6NCGJXKEJ X-Message-ID-Hash: DQX32TEKJMYGEOKHBJILVHP6NCGJXKEJ X-MailFrom: mhiramat@kernel.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Pekka Paalanen , Mathieu Desnoyers , linux-kernel@vger.kernel.org, nouveau@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org X-Mailman-Version: 3.3.8 Precedence: list List-Id: Nouveau development list Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Masami Hiramatsu (Google) 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(). Fixes: 173ed24ee2d6 ("mmiotrace: count events lost due to not recording") Assisted-by: Antigravity:gemini-3.6-flash Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace_mmiotrace.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c index b88b8d9923ad..e064ba3f28cb 100644 --- a/kernel/trace/trace_mmiotrace.c +++ b/kernel/trace/trace_mmiotrace.c @@ -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); }