Re: [PATCH v1 1/4] misc: fastrpc: Add CRC support using invokeV2 request

[kernel test robot <lkp@intel.com>]

Hi Ekansh,

kernel test robot noticed the following build errors:

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on char-misc/char-misc-next char-misc/char-misc-linus linus/master v6.12-rc2 next-20241004]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Ekansh-Gupta/misc-fastrpc-Add-CRC-support-using-invokeV2-request/20241007-164734
base:   char-misc/char-misc-testing
patch link:    https://lore.kernel.org/r/20241007084518.3649876-2-quic_ekangupt%40quicinc.com
patch subject: [PATCH v1 1/4] misc: fastrpc: Add CRC support using invokeV2 request
config: arm-randconfig-002-20241008 (https://download.01.org/0day-ci/archive/20241008/202410080940.S7Rar8Zi-lkp@intel.com/config)
compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project fef3566a25ff0e34fb87339ba5e13eca17cec00f)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241008/202410080940.S7Rar8Zi-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410080940.S7Rar8Zi-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from drivers/misc/fastrpc.c:7:
   In file included from include/linux/dma-buf.h:19:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:2213:
   include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
     518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
         |                               ~~~~~~~~~~~ ^ ~~~
>> drivers/misc/fastrpc.c:1696:12: error: incompatible pointer to integer conversion assigning to '__u64' (aka 'unsigned long long') from 'struct fastrpc_invoke_args *' [-Wint-conversion]
    1696 |         inv->args = args;
         |                   ^ ~~~~
>> drivers/misc/fastrpc.c:1716:8: error: incompatible integer to pointer conversion passing '__u64' (aka 'unsigned long long') to parameter of type 'const void *' [-Wint-conversion]
    1716 |         kfree(inv.args);
         |               ^~~~~~~~
   include/linux/slab.h:446:24: note: passing argument to parameter 'objp' here
     446 | void kfree(const void *objp);
         |                        ^
   drivers/misc/fastrpc.c:1734:8: error: incompatible integer to pointer conversion passing '__u64' (aka 'unsigned long long') to parameter of type 'const void *' [-Wint-conversion]
    1734 |         kfree(inv2.inv.args);
         |               ^~~~~~~~~~~~~
   include/linux/slab.h:446:24: note: passing argument to parameter 'objp' here
     446 | void kfree(const void *objp);
         |                        ^
   1 warning and 3 errors generated.


vim +1696 drivers/misc/fastrpc.c

  1677	
  1678	static int fastrpc_copy_args(struct fastrpc_invoke *inv)
  1679	{
  1680		struct fastrpc_invoke_args *args = NULL;
  1681		u32 nscalars;
  1682	
  1683		/* nscalars is truncated here to max supported value */
  1684		nscalars = REMOTE_SCALARS_LENGTH(inv->sc);
  1685		if (nscalars) {
  1686			args = kcalloc(nscalars, sizeof(*args), GFP_KERNEL);
  1687			if (!args)
  1688				return -ENOMEM;
  1689	
  1690			if (copy_from_user(args, (void __user *)(uintptr_t)inv->args,
  1691					   nscalars * sizeof(*args))) {
  1692				kfree(args);
  1693				return -EFAULT;
  1694			}
  1695		}
> 1696		inv->args = args;
  1697	
  1698		return 0;
  1699	}
  1700	
  1701	static int fastrpc_invoke(struct fastrpc_user *fl, char __user *argp)
  1702	{
  1703		struct fastrpc_invoke_v2 ioctl = {0};
  1704		struct fastrpc_invoke inv;
  1705		int err;
  1706	
  1707		if (copy_from_user(&inv, argp, sizeof(inv)))
  1708			return -EFAULT;
  1709	
  1710		err = fastrpc_copy_args(&inv);
  1711		if (err)
  1712			return err;
  1713	
  1714		ioctl.inv = inv;
  1715		err = fastrpc_internal_invoke(fl, false, &ioctl);
> 1716		kfree(inv.args);
  1717	
  1718		return err;
  1719	}
  1720	

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