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 651FB38AC83; Sun, 9 Aug 2026 02:32:17 +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=1786242739; cv=none; b=hR8GCKH1BXHTbAArc2QQsXU7mBqpAvlyjyZksW/VeU+ql12EdEDaaV54EZOkYkAy90XxyYrHu4Y5iZQoSRL1HgGVuRpsB7EalFQaqxW2JI2E8KW4Qy8bNmwF2McFBjmCuAiCD8Op9XxkeIiGQUFvfCe0W7or2X2E2S0ja2LJOsI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786242739; c=relaxed/simple; bh=G2JcI7zZny1pDHlT26ifDULaTmvkqZrOzjFrh01/dJY=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=OMNmJqec67Im4jIAP/6Ql4Ue2qLuLzqm+Xm3AeKcCeoQn7kaUBsJ83FyAX/Uj8X9gOKWiDmSxgkVZ749cJ0soPeBOErCVrAcqYYKGSURpQRypyr7mZtOOGRGanE7rkpZEVvmHf5IBjgthu8DOiZBhWtuXCsPdDpyMW6E5T9w5FA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LVRvQqlH; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LVRvQqlH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA8631F01559; Sun, 9 Aug 2026 02:32:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786242736; bh=UyyWp3NwzGcFwkjSQWDprdH9t2NSEehPe+aAU1OMBpU=; h=Date:From:To:Cc:Subject:References; b=LVRvQqlHg0UjneGi9ZeJIErL3tT3J+heCabWPBa/me0CyFGWQdD6nu9ha8sOwLwBW tNIIh/Lnz6zJh56p2/yNIEbaQ/wZ/CBHsNqxms05OjZ6FdajJ/7i7Lzd1agX8fHpfI AKNb8Wqb7TOF//E7XblqjGpsTlSmm6J7tohH6Tg12Pc49ASNE/+9+PfWlnfgEP8aVM QOxCRMeFF65VikOm4p3/XPgOgushjcejGEtJJGeRlYw2Z8eKAbdHYTAq1B7+LjSNud 9fPWBe3/gDxxmf8dN5+sYFGW8lIXf0F3G/9G9qWaIGWmcwT0JCRpDwFTshSif2qTMA 4wRAxIi0h/WGA== Received: from rostedt by gandalf with local (Exim 4.99.4) (envelope-from ) id 1wstKp-00000001N7g-0L6P; Sat, 08 Aug 2026 22:32:23 -0400 Message-ID: <20260809023222.955041844@kernel.org> User-Agent: quilt/0.69 Date: Sat, 08 Aug 2026 22:31:55 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , stable@vger.kernel.org, Vincent Donnefort Subject: [for-linus][PATCH 11/12] ring-buffer: Initialise reader page order in rb_allocate_cpu_buffer() References: <20260809023144.852271250@kernel.org> 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 From: Vincent Donnefort In rb_allocate_cpu_buffer(), bpage->order was omitted, leaving it as 0. This is an issue for a ring-buffer with subbufs bigger than PAGE_SIZE if when freed: free_buffer_page() relies on this value. Align the value with the actual allocation size (buffer::subbuf_order). Cc: stable@vger.kernel.org Fixes: f9b94daa542a ("ring-buffer: Set new size of the ring buffer sub page") Link: https://patch.msgid.link/20260806211306.3704194-4-vdonnefort@google.com Signed-off-by: Vincent Donnefort Signed-off-by: Steven Rostedt --- kernel/trace/ring_buffer.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 6cbd80ccef37..760a00e8505c 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2510,6 +2510,7 @@ rb_allocate_cpu_buffer(struct trace_buffer *buffer, long nr_pages, int cpu) bpage = alloc_cpu_page(cpu); if (!bpage) return NULL; + bpage->order = cpu_buffer->buffer->subbuf_order; rb_check_bpage(cpu_buffer, bpage); -- 2.53.0