From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] caif: reduce stack size with KASAN
Date: Fri, 19 Jan 2018 14:02:44 -0500 (EST)
Message-ID: <20180119.140244.1017370023425696102.davem@davemloft.net>
References: <20180116163417.1580826-1-arnd@arndb.de>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: dmitry.tarnyagin@lockless.no, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
To: arnd@arndb.de
Return-path: <netdev-owner@vger.kernel.org>
Received: from shards.monkeyblade.net ([184.105.139.130]:45446 "EHLO
        shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1755830AbeASTCs (ORCPT
        <rfc822;netdev@vger.kernel.org>); Fri, 19 Jan 2018 14:02:48 -0500
In-Reply-To: <20180116163417.1580826-1-arnd@arndb.de>
Sender: netdev-owner@vger.kernel.org
List-ID: <netdev.vger.kernel.org>

From: Arnd Bergmann <arnd@arndb.de>
Date: Tue, 16 Jan 2018 17:34:00 +0100

> When CONFIG_KASAN is set, we can use relatively large amounts of kernel
> stack space:
> 
> net/caif/cfctrl.c:555:1: warning: the frame size of 1600 bytes is larger than 1280 bytes [-Wframe-larger-than=]
> 
> This adds convenience wrappers around cfpkt_extr_head(), which is responsible
> for most of the stack growth. With those wrapper functions, gcc apparently
> starts reusing the stack slots for each instance, thus avoiding the
> problem.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> I sent this in December, but apparently got the wrong Cc list.
> It also seems that Dmitry Tarnyagin's email address as listed
> in the MAINTAINERS file is invalid.
> 
> Resending now.

Applied to net-next, thanks Arnd.