linux-kernel - drivers/remoteproc/ti_k3_r5_remoteproc.c:711:17: sparse: sparse: cast removes address space '_

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Message-ID: <202208041755.1ESNUjjz-lkp@intel.com>
Date:   Thu, 4 Aug 2022 17:43:53 +0800
From:   kernel test robot <lkp@...el.com>
To:     Suman Anna <s-anna@...com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: drivers/remoteproc/ti_k3_r5_remoteproc.c:711:17: sparse: sparse:
 cast removes address space '__iomem' of expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b44f2fd87919b5ae6e1756d4c7ba2cbba22238e1
commit: 1168af40b1ad8cb2e78f4a70869fa4a076320e4f remoteproc: k3-r5: Add support for IPC-only mode for all R5Fs
date:   5 months ago
config: arm64-randconfig-s043-20220804 (https://download.01.org/0day-ci/archive/20220804/202208041755.1ESNUjjz-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1168af40b1ad8cb2e78f4a70869fa4a076320e4f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 1168af40b1ad8cb2e78f4a70869fa4a076320e4f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/remoteproc/ drivers/vfio/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

sparse warnings: (new ones prefixed by >>)
   drivers/remoteproc/ti_k3_r5_remoteproc.c:476:28: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void *p @@     got void [noderef] __iomem *cpu_addr @@
   drivers/remoteproc/ti_k3_r5_remoteproc.c:476:28: sparse:     expected void *p
   drivers/remoteproc/ti_k3_r5_remoteproc.c:476:28: sparse:     got void [noderef] __iomem *cpu_addr
   drivers/remoteproc/ti_k3_r5_remoteproc.c:479:28: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void *p @@     got void [noderef] __iomem *cpu_addr @@
   drivers/remoteproc/ti_k3_r5_remoteproc.c:479:28: sparse:     expected void *p
   drivers/remoteproc/ti_k3_r5_remoteproc.c:479:28: sparse:     got void [noderef] __iomem *cpu_addr
>> drivers/remoteproc/ti_k3_r5_remoteproc.c:711:17: sparse: sparse: cast removes address space '__iomem' of expression

vim +/__iomem +711 drivers/remoteproc/ti_k3_r5_remoteproc.c

   681	
   682	/*
   683	 * This function implements the .get_loaded_rsc_table() callback and is used
   684	 * to provide the resource table for the booted R5F in IPC-only mode. The K3 R5F
   685	 * firmwares follow a design-by-contract approach and are expected to have the
   686	 * resource table at the base of the DDR region reserved for firmware usage.
   687	 * This provides flexibility for the remote processor to be booted by different
   688	 * bootloaders that may or may not have the ability to publish the resource table
   689	 * address and size through a DT property. This callback is invoked only in
   690	 * IPC-only mode.
   691	 */
   692	static struct resource_table *k3_r5_get_loaded_rsc_table(struct rproc *rproc,
   693								 size_t *rsc_table_sz)
   694	{
   695		struct k3_r5_rproc *kproc = rproc->priv;
   696		struct device *dev = kproc->dev;
   697	
   698		if (!kproc->rmem[0].cpu_addr) {
   699			dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
   700			return ERR_PTR(-ENOMEM);
   701		}
   702	
   703		/*
   704		 * NOTE: The resource table size is currently hard-coded to a maximum
   705		 * of 256 bytes. The most common resource table usage for K3 firmwares
   706		 * is to only have the vdev resource entry and an optional trace entry.
   707		 * The exact size could be computed based on resource table address, but
   708		 * the hard-coded value suffices to support the IPC-only mode.
   709		 */
   710		*rsc_table_sz = 256;
 > 711		return (struct resource_table *)kproc->rmem[0].cpu_addr;
   712	}
   713	

-- 
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