linux-kernel - drivers/remoteproc/ti_k3_dsp_remoteproc.c:432:17: sparse: sparse: cast removes address space '_

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Message-ID: <202302101148.6G7bpFTn-lkp@intel.com>
Date:   Fri, 10 Feb 2023 11:20:07 +0800
From:   kernel test robot <lkp@...el.com>
To:     Suman Anna <s-anna@...com>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: drivers/remoteproc/ti_k3_dsp_remoteproc.c:432:17: sparse: sparse:
 cast removes address space '__iomem' of expression

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   38c1e0c65865426676123cc9a127526fa02bcac6
commit: b8431920391d36c273f63a29eab0dfc7e884dd17 remoteproc: k3-dsp: Add support for IPC-only mode for all K3 DSPs
date:   11 months ago
config: arm64-randconfig-s043-20230208 (https://download.01.org/0day-ci/archive/20230210/202302101148.6G7bpFTn-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=b8431920391d36c273f63a29eab0dfc7e884dd17
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b8431920391d36c273f63a29eab0dfc7e884dd17
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$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/infiniband/hw/hns/ drivers/remoteproc/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202302101148.6G7bpFTn-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/remoteproc/ti_k3_dsp_remoteproc.c:432:17: sparse: sparse: cast removes address space '__iomem' of expression

vim +/__iomem +432 drivers/remoteproc/ti_k3_dsp_remoteproc.c

   402	
   403	/*
   404	 * This function implements the .get_loaded_rsc_table() callback and is used
   405	 * to provide the resource table for a booted DSP in IPC-only mode. The K3 DSP
   406	 * firmwares follow a design-by-contract approach and are expected to have the
   407	 * resource table at the base of the DDR region reserved for firmware usage.
   408	 * This provides flexibility for the remote processor to be booted by different
   409	 * bootloaders that may or may not have the ability to publish the resource table
   410	 * address and size through a DT property. This callback is invoked only in
   411	 * IPC-only mode.
   412	 */
   413	static struct resource_table *k3_dsp_get_loaded_rsc_table(struct rproc *rproc,
   414								  size_t *rsc_table_sz)
   415	{
   416		struct k3_dsp_rproc *kproc = rproc->priv;
   417		struct device *dev = kproc->dev;
   418	
   419		if (!kproc->rmem[0].cpu_addr) {
   420			dev_err(dev, "memory-region #1 does not exist, loaded rsc table can't be found");
   421			return ERR_PTR(-ENOMEM);
   422		}
   423	
   424		/*
   425		 * NOTE: The resource table size is currently hard-coded to a maximum
   426		 * of 256 bytes. The most common resource table usage for K3 firmwares
   427		 * is to only have the vdev resource entry and an optional trace entry.
   428		 * The exact size could be computed based on resource table address, but
   429		 * the hard-coded value suffices to support the IPC-only mode.
   430		 */
   431		*rsc_table_sz = 256;
 > 432		return (struct resource_table *)kproc->rmem[0].cpu_addr;
   433	}
   434	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests