From nobody Tue Apr 7 01:07:00 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 8F4FF371072; Tue, 17 Mar 2026 09:36:28 +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=1773740188; cv=none; b=LXA0IUU69ZhwI7a3srFFQUCpoItdxVamUewgghNoyEH6jBJ4XysFltbfWSGa1fORxprmZuyB5H18I7tQseQg8MvFNxATcPmBcHyg/4yx49oVgg91ZElPq642KrcHCt65Lw2BZqAYdESsQaWmxF0emqwgSheMy8PDnYRkNuV5UVw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773740188; c=relaxed/simple; bh=dnkb6p/eQabzlKwOsghBnbUtdqt485jhvOonh5ntruY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Ia4KSUYmpTFY4J2XuPmOoGGxas0sARX0XWLDoMsONxv/pulqI5zZJQrNM2CdgCKyjyBISVUOgwQss0glnEDOTVuxjmsRNE0n+wrLxKs6MGl05bbFs8fkZDZIwh/2C7kntp2KUn74Hq74LKQChrbSIFQ7NxzDKHQ2YhT2yhJU9kU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kkNCI6KC; 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="kkNCI6KC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65DBFC4CEF7; Tue, 17 Mar 2026 09:36:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773740188; bh=dnkb6p/eQabzlKwOsghBnbUtdqt485jhvOonh5ntruY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kkNCI6KCcoSbIGE35yWrT+la6Q49tptr7+dkvUP6rJZY+XkXdKqhFK5Czo6s37+kI pBZQ+YL3c7YKwMi9SARLtsnDMysC8poX/CpruZTxBRpCDTl2lT6aUXxNyZsJn6Y/HH fP8FmxS9bCMT7vep7SCDKfFgHlOIP7j0zfiAWUxxbafhNmQ6crC1xH4/dG5aD8VlKr zqFIOgojExK68PXtT9kmLIFfmpeeaJuM8uHTVbtvdvcIFFJzBpvQEE6Si3J0aikVN2 YzagfKw1nlQcrWmPPYMVe72aEsmlF/7hFlqAk5ViTibvl555eD96TR6vfrDim62Ang GZYjh9cxeOFog== 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 v10 1/5] ring-buffer: Fix to update per-subbuf entries of persistent ring buffer Date: Tue, 17 Mar 2026 18:36:25 +0900 Message-ID: <177374018573.2358053.10088271720776923412.stgit@mhiramat.tok.corp.google.com> X-Mailer: git-send-email 2.53.0.851.ga537e3e6e9-goog In-Reply-To: <177374017536.2358053.12341235939816794384.stgit@mhiramat.tok.corp.google.com> References: <177374017536.2358053.12341235939816794384.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 96e0d80d492b..d6bebb782efc 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2024,7 +2024,7 @@ 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;