linux-kernel - Re: [PATCH] [net-next] ISDN: eicon: reduce stack size of sig

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Date:   Thu, 26 Jan 2017 14:00:33 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     arnd@...db.de
Cc:     mac@...ware.de, isdn@...ux-pingi.de, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [net-next] ISDN: eicon: reduce stack size of sig_ind
 function

From: Arnd Bergmann <arnd@...db.de>
Date: Wed, 25 Jan 2017 23:15:53 +0100

> I noticed that this function uses a lot of kernel stack when the
> "latent entropy" plugin is enabled:
> 
> drivers/isdn/hardware/eicon/message.c: In function 'sig_ind':
> drivers/isdn/hardware/eicon/message.c:6113:1: error: the frame size of 1168 bytes is larger than 1152 bytes [-Werror=frame-larger-than=]
> 
> We currently don't warn about this, as we raise the warning limit
> to 2048 bytes in mainline, but I'd like to lower that limit again
> in the future, and this function can easily be changed to be more
> efficient and avoid that warning, by making some of its local
> variables 'const'.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied, thanks Arnd.