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 5083E46D091; Thu, 20 Aug 2026 17:34:41 +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=1787247282; cv=none; b=nbGl2HiGOzrWc6f9LvzFor2QLnmsno2FkmJaLgDKbvWThQ1OrNo2vzVjULZ8U3+cxA5p20NUaIZaIfBf+kLkrvBQnfMqq6an8HmXXHx2HQa3SNx9r7924W+AhhDXn8uZULj9oJon4K3l0iiEyMYkjF2+ObhZpHCkN4Kq8ENugZY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787247282; c=relaxed/simple; bh=8rFdU7W3kjE5aCejvic+byoo3aCycqjySkxsDgONBoc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iFqTYLiCk25d4K9qLlTB3ccTwOV8V9H1gEfd6CDbzH2kIGj0toe/4zX7d3N/qsczhqvLDBbr0cR7GFzcfYfwgGiZiPkcMW4d/0YRVgLfBDIJsRBdSPVXH4chSJHT/SvwyNkr6n6KSDlRQYFSSumlmArOX8QMsywinegeZinbbG4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=wSk05rBU; 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="wSk05rBU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AEDBD1F000E9; Thu, 20 Aug 2026 17:34:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1787247281; bh=k3uGY+JgjzB8eu+DlOMT3TSiz6ZndmJHzZxWLstypPE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=wSk05rBUq7G8je4HvNAx8r+I8FZjXdFB/zF6RUODg0CevPEUP51CYU80bIent5ZvP CJUoGZd46RI1NI20CDYkbMLuYpwlI1afXw9HtkMjG9fnB+3nfFKDdmjeWJ1qVCGreA CvA+5alwE7eWPAf1yjI9Llyx+Vpxy0oAzkGawrpQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vincent Donnefort , Steven Rostedt , Sasha Levin Subject: [PATCH 6.12 185/220] ring-buffer: Prevent resizing of persistent ring buffer Date: Thu, 20 Aug 2026 16:56:15 +0200 Message-ID: <20260820145229.060320158@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260820145223.480031205@linuxfoundation.org> References: <20260820145223.480031205@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vincent Donnefort [ Upstream commit 7c727dfce6be04dd009b29091a4a17d952dbfe03 ] 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 [ Dropped the incoming `} else if (buffer->remote) {` branch context, which does not exist in this tree. ] Signed-off-by: Sasha Levin 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 @@ -2239,6 +2239,8 @@ 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 { page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_COMP | __GFP_ZERO,