From nobody Wed Apr 8 04:59:44 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1F10412B94; Wed, 11 Mar 2026 01:32:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773192744; cv=none; b=fhKMvvoSnsRIOIUnBP3F/MxO+YSrpNYbK8unR3BA+ShTSuc+9GCRXwcVZ6khYNNkWVKPQYV5FfJfEk96N67YkiUlGvjRFvOi6+a7HS4w5nravp3rMWXP7n10v3QA23bxQ2CvdFsHYubKjHQE9NLbs3yB1J0WOia60PjXKnM1IzE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773192744; c=relaxed/simple; bh=Z2G83oBH5vx8KCsX/GwG5z6coID67lhhovuf7Wvz6FM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=JyOxdgCArKaioZsv5t9ceCPx6IaVbcC4Nn81K+sdjUpn+XnLqzA9Vy0cxUED6Xm4I5QSWUvGSrPjHENJJ9W/FHfFdXl2hBr55vPwtPgHIW6IJ1KYp/KhKYzQhpoTH4bAmtKvXCSzfzTgfRa5ORycw6FPqYg/1RUWoks5GtRfLiI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Hzj5RLK0; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Hzj5RLK0" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC016C19423; Wed, 11 Mar 2026 01:32:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773192743; bh=Z2G83oBH5vx8KCsX/GwG5z6coID67lhhovuf7Wvz6FM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hzj5RLK0g6MoZ0Hn5PdtIZla5E5hHE2TCy/cvT1eUKj2qdqxBAYxDbLur5a8wN32d OnoiEEHhFmLi4OqzIYGQr5hextXlLPl1apKeMCSy36pWfJM8yL8VwybveXTZe4Xf06 JDBmDbiPZ92sOSihwlrxdUJPRAnI/T2g7jqTyP1UH6DotXjZwUzcVXeQGo2faGgqJQ wAlNIqD8fJW21VjoOuN0JAuy2gQgMhyn73cvxSlJmQBxLa+3sdDdy2AvugEviXY8fK Xx8xQ+PK28MCRbbf3P89s8cKaJuNVCA+BpDx3B2lCvklbQTAH0z7YCLtQn/0ljGUFL 9OLXdzcwxvyYQ== From: "Masami Hiramatsu (Google)" To: Steven Rostedt Cc: Masami Hiramatsu , Mathieu Desnoyers , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Ian Rogers Subject: [PATCH v9 1/4] ring-buffer: Fix to update per-subbuf entries of persistent ring buffer Date: Wed, 11 Mar 2026 10:32:21 +0900 Message-ID: <177319274126.130641.15502329149412118852.stgit@mhiramat.tok.corp.google.com> X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog In-Reply-To: <177319273059.130641.10882692460536780093.stgit@mhiramat.tok.corp.google.com> References: <177319273059.130641.10882692460536780093.stgit@mhiramat.tok.corp.google.com> User-Agent: StGit/0.19 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" Content-Transfer-Encoding: quoted-printable From: Masami Hiramatsu (Google) Since the validation loop in rb_meta_validate_events() updates the same cpu_buffer->head_page->entries, the other subbuf entries are not updated. Fix to use head_page to update the entries field, since it is the cursor in this loop. Fixes: 5f3b6e839f3c ("ring-buffer: Validate boot range memory events") Cc: stable@vger.kernel.org Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/ring_buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index f16f053ef77d..353a5aa1b612 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2053,7 +2053,7 @@ static void rb_meta_validate_events(struct ring_buffe= r_per_cpu *cpu_buffer) =20 entries +=3D ret; entry_bytes +=3D local_read(&head_page->page->commit); - local_set(&cpu_buffer->head_page->entries, ret); + local_set(&head_page->entries, ret); =20 if (head_page =3D=3D cpu_buffer->commit_page) break;