linux-kernel - drivers/media/platform/cadence/cdns-csi2tx.c:477:11: error: implicit declaration of function 'kzalloc'

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Message-ID: <201806222046.Jlaf01SO%fengguang.wu@intel.com>
Date:   Fri, 22 Jun 2018 20:14:53 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <m.chehab@...sung.com>,
        linux-media@...r.kernel.org,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: drivers/media/platform/cadence/cdns-csi2tx.c:477:11: error: implicit
 declaration of function 'kzalloc'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   894b8c000ae6c106cc434ee0000dfb77df8bd9db
commit: 6f684d4fcce5eddd7e216a18975fb798d11a83dd media: v4l: cadence: Add Cadence MIPI-CSI2 TX driver
date:   5 weeks ago
config: x86_64-randconfig-u0-06221943 (attached as .config)
compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
reproduce:
        git checkout 6f684d4fcce5eddd7e216a18975fb798d11a83dd
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/media/platform/cadence/cdns-csi2tx.c: In function 'csi2tx_probe':
>> drivers/media/platform/cadence/cdns-csi2tx.c:477:11: error: implicit declaration of function 'kzalloc' [-Werror=implicit-function-declaration]
     csi2tx = kzalloc(sizeof(*csi2tx), GFP_KERNEL);
              ^
   drivers/media/platform/cadence/cdns-csi2tx.c:477:9: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
     csi2tx = kzalloc(sizeof(*csi2tx), GFP_KERNEL);
            ^
>> drivers/media/platform/cadence/cdns-csi2tx.c:531:2: error: implicit declaration of function 'kfree' [-Werror=implicit-function-declaration]
     kfree(csi2tx);
     ^
   cc1: some warnings being treated as errors

vim +/kzalloc +477 drivers/media/platform/cadence/cdns-csi2tx.c

   470	
   471	static int csi2tx_probe(struct platform_device *pdev)
   472	{
   473		struct csi2tx_priv *csi2tx;
   474		unsigned int i;
   475		int ret;
   476	
 > 477		csi2tx = kzalloc(sizeof(*csi2tx), GFP_KERNEL);
   478		if (!csi2tx)
   479			return -ENOMEM;
   480		platform_set_drvdata(pdev, csi2tx);
   481		mutex_init(&csi2tx->lock);
   482		csi2tx->dev = &pdev->dev;
   483	
   484		ret = csi2tx_get_resources(csi2tx, pdev);
   485		if (ret)
   486			goto err_free_priv;
   487	
   488		v4l2_subdev_init(&csi2tx->subdev, &csi2tx_subdev_ops);
   489		csi2tx->subdev.owner = THIS_MODULE;
   490		csi2tx->subdev.dev = &pdev->dev;
   491		csi2tx->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
   492		snprintf(csi2tx->subdev.name, V4L2_SUBDEV_NAME_SIZE, "%s.%s",
   493			 KBUILD_MODNAME, dev_name(&pdev->dev));
   494	
   495		ret = csi2tx_check_lanes(csi2tx);
   496		if (ret)
   497			goto err_free_priv;
   498	
   499		/* Create our media pads */
   500		csi2tx->subdev.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
   501		csi2tx->pads[CSI2TX_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
   502		for (i = CSI2TX_PAD_SINK_STREAM0; i < CSI2TX_PAD_MAX; i++)
   503			csi2tx->pads[i].flags = MEDIA_PAD_FL_SINK;
   504	
   505		/*
   506		 * Only the input pads are considered to have a format at the
   507		 * moment. The CSI link can multiplex various streams with
   508		 * different formats, and we can't expose this in v4l2 right
   509		 * now.
   510		 */
   511		for (i = CSI2TX_PAD_SINK_STREAM0; i < CSI2TX_PAD_MAX; i++)
   512			csi2tx->pad_fmts[i] = fmt_default;
   513	
   514		ret = media_entity_pads_init(&csi2tx->subdev.entity, CSI2TX_PAD_MAX,
   515					     csi2tx->pads);
   516		if (ret)
   517			goto err_free_priv;
   518	
   519		ret = v4l2_async_register_subdev(&csi2tx->subdev);
   520		if (ret < 0)
   521			goto err_free_priv;
   522	
   523		dev_info(&pdev->dev,
   524			 "Probed CSI2TX with %u/%u lanes, %u streams, %s D-PHY\n",
   525			 csi2tx->num_lanes, csi2tx->max_lanes, csi2tx->max_streams,
   526			 csi2tx->has_internal_dphy ? "internal" : "no");
   527	
   528		return 0;
   529	
   530	err_free_priv:
 > 531		kfree(csi2tx);
   532		return ret;
   533	}
   534	

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