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 2647C40DB22; Mon, 17 Aug 2026 14:14:17 +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=1786976058; cv=none; b=dwJw8/pnz2KjUqSlcFMJaREgDTKpFtbF+qfWgyHUzMDvJPo3H/wV0N+NkWfDUFH9egFzZLODlG3AZS6c4ttEmIyeQe4IJjCfuTJgYPtgvaLclwdxnL0xtxaFoYawVbEFNuyhSYPlk/PdChE+rSgh+hkeP6ooqLVfg8DNbe5bcSs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786976058; c=relaxed/simple; bh=L26hyiYFyqHy6z85Q2hP/RJaKwbuyamMQ2wvThz9wYw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TDJVsNgsO2Gh/rYpslShn2lLwOIeInlZJgy0GAzxiClVc/3k2cebnVt3BlxfP5W78tu1Nbr7YwadlMM5lApZIgDN+uXU//yGtJa050m0N1GuIEb720OW4r3MMJ2mVmdJXXW8aEbrElXlcLCrXChA0BiEkdfSmonjPeLk2GmFR24= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=vOfDpQ2e; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="vOfDpQ2e" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F8601F000E9; Mon, 17 Aug 2026 14:14:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786976057; bh=S/S6sVtuET8lwnCQrGU6pwCtLoYuA39jO8/sP8yf6nQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=vOfDpQ2eeE9DYZBelLqcKSkiufYzDwP373LBEkpZ7N7mYBCjCAPQkpDUsXyk4COOq q2zKhUDatZ4e07ylhZ/o28O1G8o3QDaQGFOyuZ2NOxS/03eicaE3m1UyBisVhAv5Q6 xttvF2RGpvLw68snPoVSY+lbGumQlpo9dJvF5nh4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Masami Hiramatsu (Google)" , Steven Rostedt , Sasha Levin Subject: [PATCH 5.10 235/389] tracing/mmiotrace: Reset dropped_count in mmio_reset_data() Date: Mon, 17 Aug 2026 15:31:14 +0200 Message-ID: <20260817132548.435257618@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132538.796021292@linuxfoundation.org> References: <20260817132538.796021292@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Masami Hiramatsu (Google) [ Upstream commit c786d2bdf1f3964deee192ad942dee2a741c1e2c ] 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 Signed-off-by: Sasha Levin --- 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 da2231ac13dfc..e8ae2d92a6787 100644 --- a/kernel/trace/trace_mmiotrace.c +++ b/kernel/trace/trace_mmiotrace.c @@ -31,6 +31,7 @@ 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