From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3BAE53F0A96; Tue, 28 Jul 2026 12:49:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785243002; cv=none; b=XrC86fXzyIbjnkP2EUau8kmrRF3mdGpmpjtqActZyXiqVVoJbupZNuKJFI/1NsBxJ1Pz+cNEz/zdxBC20H+d25PXiROxK6LH4jdS1sOFIjf/eni/XRBLJdcRawPcpHvoiTDWrVnVPy/Nhw20CuoMRZLoerSwW00wT4en5hpgbQ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785243002; c=relaxed/simple; bh=2SwRgdQ0V1SjrXbSJJ6Dqk/2FBtQZ75F8VZePlgbyyE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=CNBlk+Kp25ThNi/IAikNFZdz0YEaS5sdGITmvFmqEpO90+jCdIn9BS6BhRGCYwADWLqWyojqNAtsUxb2l0xiIdqxJ8Yecb6zT1hMbxHnPVnoMMgWSJLdN1StEXfHd+pNu2s7oT5x11jDgvK4IYFJOAt7SO1TJsbxdgHNvMnN8Ws= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BNxlql1E; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BNxlql1E" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 88EE91F00A3A; Tue, 28 Jul 2026 12:49:53 +0000 (UTC) DKIM-Signature: v=1; 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 Cc: Pekka Paalanen , Mathieu Desnoyers , linux-kernel@vger.kernel.org, nouveau@lists.freedesktop.org, linux-trace-kernel@vger.kernel.org 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 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit 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); }