linux-kernel - Re: drivers/input/misc/iqs626a.c:1645:12: warning: stack frame size of 2560 bytes in function 'iqs626

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Date:   Sat, 5 Jun 2021 21:43:46 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Jeff LaBundy <jeff@...undy.com>, kbuild-all@...ts.01.org,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: drivers/input/misc/iqs626a.c:1645:12: warning: stack frame size
 of 2560 bytes in function 'iqs626_probe'

On Sun, Jun 06, 2021 at 12:37:43PM +0800, kernel test robot wrote:
> Hi Jeff,
> 
> FYI, the error/warning still remains.

I have no idea how it happens... 

> > 1645	static int iqs626_probe(struct i2c_client *client)
>   1646	{
>   1647		struct iqs626_ver_info ver_info;

This is 4 bytes.

>   1648		struct iqs626_private *iqs626;

This is 4 or 8.

>   1649		int error;

And another 4. And that is it. The bloat must be coming from elsewhere.

>   1650	
>   1651		iqs626 = devm_kzalloc(&client->dev, sizeof(*iqs626), GFP_KERNEL);
>   1652		if (!iqs626)
>   1653			return -ENOMEM;
>   1654	
>   1655		i2c_set_clientdata(client, iqs626);
>   1656		iqs626->client = client;
>   1657	
>   1658		iqs626->regmap = devm_regmap_init_i2c(client, &iqs626_regmap_config);
>   1659		if (IS_ERR(iqs626->regmap)) {
>   1660			error = PTR_ERR(iqs626->regmap);
>   1661			dev_err(&client->dev, "Failed to initialize register map: %d\n",
>   1662				error);
>   1663			return error;
>   1664		}
>   1665	
>   1666		init_completion(&iqs626->ati_done);
>   1667	
>   1668		error = regmap_raw_read(iqs626->regmap, IQS626_VER_INFO, &ver_info,
>   1669					sizeof(ver_info));
>   1670		if (error)
>   1671			return error;
>   1672	
>   1673		if (ver_info.prod_num != IQS626_VER_INFO_PROD_NUM) {
>   1674			dev_err(&client->dev, "Unrecognized product number: 0x%02X\n",
>   1675				ver_info.prod_num);
>   1676			return -EINVAL;
>   1677		}
>   1678	
>   1679		error = iqs626_parse_prop(iqs626);
>   1680		if (error)
>   1681			return error;
>   1682	
>   1683		error = iqs626_input_init(iqs626);
>   1684		if (error)
>   1685			return error;
>   1686	
>   1687		error = devm_request_threaded_irq(&client->dev, client->irq,
>   1688						  NULL, iqs626_irq, IRQF_ONESHOT,
>   1689						  client->name, iqs626);
>   1690		if (error) {
>   1691			dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
>   1692			return error;
>   1693		}
>   1694	
>   1695		if (!wait_for_completion_timeout(&iqs626->ati_done,
>   1696						 msecs_to_jiffies(2000))) {
>   1697			dev_err(&client->dev, "Failed to complete ATI\n");
>   1698			return -ETIMEDOUT;
>   1699		}
>   1700	
>   1701		/*
>   1702		 * The keypad may include one or more switches and is not registered
>   1703		 * until ATI is complete and the initial switch states are read.
>   1704		 */
>   1705		error = input_register_device(iqs626->keypad);
>   1706		if (error)
>   1707			dev_err(&client->dev, "Failed to register keypad: %d\n", error);
>   1708	
>   1709		return error;
>   1710	}
>   1711	

Thanks.

-- 
Dmitry