linux-kernel - Re: sound/soc/intel/skylake/skl-topology.c:3642:1: warning: the frame size of 1256 bytes is larger than 1024 bytes

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Date:   Wed, 4 Nov 2020 11:10:22 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     kernel test robot <lkp@...el.com>,
        Mateusz Gorski <mateusz.gorski@...ux.intel.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>,
        Cezary Rojewski <cezary.rojewski@...el.com>
Subject: Re: sound/soc/intel/skylake/skl-topology.c:3642:1: warning: the frame
 size of 1256 bytes is larger than 1024 bytes


>     sound/soc/intel/skylake/skl-topology.c: In function 'skl_tplg_complete':
>>> sound/soc/intel/skylake/skl-topology.c:3642:1: warning: the frame size of 1256 bytes is larger than 1024 bytes [-Wframe-larger-than=]
>      3642 | }
>           | ^
> 
> vim +3642 sound/soc/intel/skylake/skl-topology.c
> 
>    3612	
>    3613	static void skl_tplg_complete(struct snd_soc_component *component)
>    3614	{
>    3615		struct snd_soc_dobj *dobj;
>    3616		struct snd_soc_acpi_mach *mach =
>    3617			dev_get_platdata(component->card->dev);
>    3618		int i;
>    3619	
>    3620		list_for_each_entry(dobj, &component->dobj_list, list) {
>    3621			struct snd_kcontrol *kcontrol = dobj->control.kcontrol;
>    3622			struct soc_enum *se =
>    3623				(struct soc_enum *)kcontrol->private_value;
>    3624			char **texts = dobj->control.dtexts;
>    3625			char chan_text[4];
>    3626	
>    3627			if (dobj->type != SND_SOC_DOBJ_ENUM ||
>    3628			    dobj->control.kcontrol->put !=
>    3629			    skl_tplg_multi_config_set_dmic)
>    3630				continue;
>    3631			sprintf(chan_text, "c%d", mach->mach_params.dmic_num);
>    3632	
>    3633			for (i = 0; i < se->items; i++) {
>    3634				struct snd_ctl_elem_value val;

that structure seems to be the root-cause of this warning. This can take 
512+128 bytes and probably does not belong on the stack.

struct snd_ctl_elem_value {
	struct snd_ctl_elem_id id;	/* W: element ID */
	unsigned int indirect: 1;	/* W: indirect access - obsoleted */
	union {
		union {
			long value[128];
			long *value_ptr;	/* obsoleted */
		} integer;
		union {
			long long value[64];
			long long *value_ptr;	/* obsoleted */
		} integer64;
		union {
			unsigned int item[128];
			unsigned int *item_ptr;	/* obsoleted */
		} enumerated;
		union {
			unsigned char data[512];
			unsigned char *data_ptr;	/* obsoleted */
		} bytes;
		struct snd_aes_iec958 iec958;
	} value;		/* RO */
	unsigned char reserved[128];
};

>    3635	
>    3636				if (strstr(texts[i], chan_text)) {
>    3637					val.value.enumerated.item[0] = i;
>    3638					kcontrol->put(kcontrol, &val);
>    3639				}
>    3640			}
>    3641		}
>> 3642	}