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 0DF9735F60F for ; Wed, 29 Jul 2026 23:55:31 +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=1785369333; cv=none; b=D9DJuu6Nb5ftaNPDsdJ7+Fm+RFxXJVi6rxghwN/korZezVH7azycaFaa8V8m8DO4Q79CL8yclCn5is5cI6p5bMsUxWKxGkx+7BTzTlJ6WdiqFq3W+v4Ngsb9KoshGXAYdj+dxY0BV/+q69dN+2ds4a7fjGr2HPYURmvtfjQoCU0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785369333; c=relaxed/simple; bh=uNmhlwXrQZ0q3MVOS2++Nk/9wLKvpFjTRC0QrynXT1w=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=sML7NGpf6lPtgjCed2vHU9fsdDppnAKLMXuSoBAcPGKTmAWV7FrRhVzZQTqZ07qFcFsbSyQ9oK4onLXRzJkwFvoHEtfMIa9pKRcklWgspDuq4S3g40Ky5Rvieye47u1lw9MrijyoyG0vsSQNyDvaVNljvIwGFGGIbD7ynYHK6hk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CLpSNV27; 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="CLpSNV27" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AF4E91F000E9; Wed, 29 Jul 2026 23:55:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785369331; bh=XMHG6W+h/8i7VBI2j1phhnaFmBhstzq9DV22Qea4SGM=; h=Date:From:To:Cc:Subject:References; b=CLpSNV2701hU3jVKcysfbu1um3m7JvUT8qPBahFU8k/kAPuVkBn25bzyuDQQewecE YpzYGGnKVxB81rOZ/tt9JZf/+aQ8KoDPl+EmVrB05auztCRYDIi14xW+akyZJfHywC hRNORP+cnvoBmYllMJkjjXqirX0u/serGPFCwz79eoGGA2Z50Sd9NOfuQgaQi+wqnv YYOaQGV+izhRg87++pjzRcFQXMR+PFCG6+kaWG7hpdZTPfyRJOEiv8R3GFESCdFU77 qDHAxZ+v9Fss5aieUhsg8dZnNnRYJ+X6X1EmTlGng9wL2g4lYVQ2tn39lTeY9uu/mp 0xkp+OeBk7X8A== Received: from rostedt by gandalf with local (Exim 4.99.4) (envelope-from ) id 1wpE88-00000007HYa-29td; Wed, 29 Jul 2026 19:56:08 -0400 Message-ID: <20260729235608.378568384@kernel.org> User-Agent: quilt/0.69 Date: Wed, 29 Jul 2026 19:55:52 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton Subject: [for-linus][PATCH 1/5] tracing/mmiotrace: Reset dropped_count in mmio_reset_data() References: <20260729235551.356165691@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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(). Link: https://patch.msgid.link/178524299122.56416.16277704230639425172.stgit@devnote2 Fixes: 173ed24ee2d6 ("mmiotrace: count events lost due to not recording") Assisted-by: Antigravity:gemini-3.6-flash Signed-off-by: Masami Hiramatsu (Google) Signed-off-by: Steven Rostedt --- 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); } -- 2.53.0