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 308CD3264D6; Fri, 7 Aug 2026 15:20:03 +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=1786116004; cv=none; b=tQKaKZAB0vM5KO1JncqAYcCGoBu78P1glIu7jcFjnoQ63JlIlQTNwU80Ljlm3KUbdpvp81Oj8zUqfw8RzypSZ9U+cP9loZD/c2BIen/xxg30Bt+Zvy1TSQ9yWhPWN+qcSVsq4l+TOM4LMIrEt/8JsnRnS9m3ZcfgZW0PJ6XYIh8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786116004; c=relaxed/simple; bh=k0M1mXrU66AHGkvzZiWEHhfi2WqLssH0hjEGSVpvN28=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=A5PXHLq3kznIg6sUzqlilHErdl6JyKl/97y2wQBLa5wtrt1wa/FNl4IsSYdyh/LArtt4GHwMhMPvp9QpINRnkvc+e4ZNDKHURk1gaqVTzpbOIoTlvDJtHg6XHTjjdxbugQP8CmVkB87AhwBo4ofgx46M0dmzjyOhLEymyw0x9AU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jN28+mAJ; 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="jN28+mAJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B3C31F00A3A; Fri, 7 Aug 2026 15:20:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786116003; bh=2F1Y9c5h55z3oKJG3GeIbPBvd2mb+6uHyLwNXUeqMO0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=jN28+mAJe4Vv/rP6JkRX7l56qOqr//tI2zFtbpRXNL0sEVvzNYe4GyAZ29gYJKhS3 UyYp9NtqkN1noM/5LEBAcQy+3mO/GRtOW51sICKm30SJKYJbbp4KK1fOJD5mki30Ng yXP+X/Las0VlYF06NYJHQe0B4iBrn1qy+tVPEIfc= 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 6.6 079/261] tracing/mmiotrace: Reset dropped_count in mmio_reset_data() Date: Fri, 7 Aug 2026 16:37:16 +0200 Message-ID: <20260807143417.089762615@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260807143415.358597922@linuxfoundation.org> References: <20260807143415.358597922@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 6.6-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 4d9e5c830dbe1..c523ce5aa4958 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