linux-kernel - Re: [PATCH] isdn: reduce stack size of mISDN

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Date:	Sun, 1 Mar 2009 17:51:39 +0100
From:	Karsten Keil <kkeil@...e.de>
To:	Frank Seidel <fseidel@...e.de>
Cc:	linux kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, kkeil@...e.de,
	linux-isdn@...r.kernel.org, Frank Seidel <frank@...eidel.de>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Andreas Eversberg <andreas@...rsberg.eu>,
	Hannes Eder <hannes@...neseder.net>,
	Adrian Bunk <bunk@...nel.org>
Subject: Re: [PATCH] isdn: reduce stack size of mISDN_dsp

On Sun, Mar 01, 2009 at 05:32:50PM +0100, Frank Seidel wrote:
> From: Frank Seidel <frank@...eidel.de>
> 
> Reduce stack size memory footprint of mISDN_dsp.
> (From 1468 bytes for dsp_cmx_send on i386 down
> to 44).
> 

I do not think we can use a static buffer here,
we may have multiple instances.

> Signed-off-by: Frank Seidel <frank@...eidel.de>
> ---
>  drivers/isdn/mISDN/dsp_cmx.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> --- a/drivers/isdn/mISDN/dsp_cmx.c
> +++ b/drivers/isdn/mISDN/dsp_cmx.c
> @@ -1592,7 +1592,8 @@ dsp_cmx_send(void *arg)
>  	struct dsp_conf_member *member;
>  	struct dsp *dsp;
>  	int mustmix, members;
> -	s32 mixbuffer[MAX_POLL+100], *c;
> +	static s32 mixbuffer[MAX_POLL+100];
> +	s32 *c;
>  	u8 *p, *q;
>  	int r, rr;
>  	int jittercheck = 0, delay, i;

-- 
Karsten Keil
SuSE Labs
ISDN and VOIP development
SUSE LINUX Products GmbH, Maxfeldstr.5 90409 Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg)
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