netdev - Re: [PATCH] net: rds: Don't allocate rds

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Message-Id: <20140826.082906.614050508596912545.davem@davemloft.net>
Date:	Tue, 26 Aug 2014 08:29:06 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	broonie@...nel.org
Cc:	chien.yen@...cle.com, rds-devel@....oracle.com,
	netdev@...r.kernel.org, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] net: rds: Don't allocate rds_sock on stack

From: Mark Brown <broonie@...nel.org>
Date: Tue, 26 Aug 2014 07:54:09 +0100

> On Mon, Aug 25, 2014 at 12:57:40PM -0700, David Miller wrote:
>> From: Mark Brown <broonie@...nel.org>
> 
>> > From: Mark Brown <broonie@...aro.org>
> 
>> > struct rds_sock is rather large ausing the following warning in an ARM
>> > allmodconfig:
> 
>> > net/rds/iw_rdma.c:200:1: warning: the frame size of 1056 bytes is larger than 1024 bytes [-Wframe-larger-than=]
> 
>> > Fix this by dynamically allocating struct rds_sock in rds_iw_update_cm_id
>> > instead of allocating it on the stack.
> 
>> > Signed-off-by: Mark Brown <broonie@...aro.org>
> 
>> I'd like you to fix this differently.  Creating pseudo instances of
>> objects, and partially initializing it, just to satisfy an interface
>> is always a really bad sign.
> 
>> Create a key structure argument for rds_iw_get_device() and initialize that
>> and pass it in instead, update the other caller similarly.
> 
> I agree that the existing code looks like it could be improved even more
> but please bear in mind that I'm just looking for a clean build (we've
> got less than 20 warnings in allmodconfig including staging at the
> minute) rather than actively working on this code in particular - I've
> no ability to do more than build testing here.

I understand that, but please fix this bug properly.
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