drivers/remoteproc/ti_k3_dsp_remoteproc.c:432:17: sparse: sparse: cast removes address space '__iomem' of expression

From: kernel test robot
Date: Wed Feb 08 2023 - 12:31:31 EST


tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 0983f6bf2bfc0789b51ddf7315f644ff4da50acb
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/20230209/202302090147.nPnh3zPZ-lkp@xxxxxxxxx/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@xxxxxxxxx>

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