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 DEA553DB310; Mon, 17 Aug 2026 13:49:21 +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=1786974564; cv=none; b=nOgymnjyfojl47u+KcKwptw4as/eyHT7eTpW9Hul4cDQ0kJMCBMaBvXE/I5Qc3SHg8nbugNQC0Z018avBgtn9ZQpTdUgn0mtw+8k3hyiR/wY4NulBHE8u7/kPGMaX7AgeFueoZBfiSChHfqyvYaNNW9Ajb9dvlhTDb/wK/rTdJ8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786974564; c=relaxed/simple; bh=UKEkGTd1vbsZWs/X6DSwt6YcZxVOi3ZVPgox8GesCYg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AUHBhmfZDecNUxC81rlzAIdOa4moKteut1KrnC46vgWNg61B8mB0t2G4diRnfdwH4u4HKxKhOZLENGY+vcSqtKind8Hj/hbIq/l/z1DDJVi2EXau4HRpue2rkSadp3Fz9HVWo5UPrmM8cInkcuUS80TE45q2JL9NxemUsUwcIuY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=riGw4yYO; 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="riGw4yYO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86DF31F00A3A; Mon, 17 Aug 2026 13:49:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786974561; bh=Tz69K/WAyewqe1E/WnD+wAGOa+GTKwUiLQjKw2+qm9s=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=riGw4yYOn2KntszsI+5QOnpHrnn8HNC6+S1CyGgiajX3VrKIX5Rbjmf4ODGEz4qkB aE4pnDRgCDnyPy04gnCyA3Sp/Lfo0NCy1CS/19YQxMf6V2KhPlvfM3HNPjpuIfo1Cb rKuIVZU7tAs5bHTUI5vAyq+uvgD/sgVM+iKv5+Lk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vincent Donnefort , Steven Rostedt Subject: [PATCH 7.1 246/271] ring-buffer: Prevent resizing of persistent ring buffer Date: Mon, 17 Aug 2026 15:32:51 +0200 Message-ID: <20260817132546.871386819@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132536.752504388@linuxfoundation.org> References: <20260817132536.752504388@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vincent Donnefort commit 7c727dfce6be04dd009b29091a4a17d952dbfe03 upstream. Dynamically resizing a persistent ring buffer is not possible. Disable the feature. Cc: stable@vger.kernel.org Fixes: be68d63a139b ("ring-buffer: Add ring_buffer_alloc_range()") Link: https://patch.msgid.link/20260806211306.3704194-2-vdonnefort@google.com Signed-off-by: Vincent Donnefort Signed-off-by: Steven Rostedt Signed-off-by: Greg Kroah-Hartman --- kernel/trace/ring_buffer.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2418,6 +2418,8 @@ rb_allocate_cpu_buffer(struct trace_buff if (cpu_buffer->ring_meta->head_buffer) rb_meta_buffer_update(cpu_buffer, bpage); bpage->range = 1; + + atomic_inc(&cpu_buffer->resize_disabled); } else if (buffer->remote) { struct ring_buffer_desc *desc = ring_buffer_desc(buffer->remote->desc, cpu);