[jens-wiklander-tee:testing/tuxbuild 6/13] drivers/tee/tee_shm.c:52:17: warning: no previous prototype for 'shm_alloc_helper'

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

tree:   http://git.linaro.org/people/jens.wiklander/linux-tee testing/tuxbuild
head:   9ea0d125d4c9a4144b8641c454e97406b483722d
commit: b056eac4e504db8ee3fb03b4d13f1c9f2653bee8 [6/13] tee: replace tee_shm_alloc()
config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20220114/202201141526.DF7opbkO-lkp@intel.com/config)
compiler: arceb-elf-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git remote add jens-wiklander-tee http://git.linaro.org/people/jens.wiklander/linux-tee
        git fetch --no-tags jens-wiklander-tee testing/tuxbuild
        git checkout b056eac4e504db8ee3fb03b4d13f1c9f2653bee8
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash drivers/tee/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/tee/tee_shm.c:52:17: warning: no previous prototype for 'shm_alloc_helper' [-Wmissing-prototypes]
      52 | struct tee_shm *shm_alloc_helper(struct tee_context *ctx, size_t size,
         |                 ^~~~~~~~~~~~~~~~


vim +/shm_alloc_helper +52 drivers/tee/tee_shm.c

    51	
  > 52	struct tee_shm *shm_alloc_helper(struct tee_context *ctx, size_t size,
    53					 size_t align, u32 flags, int id)
    54	{
    55		struct tee_device *teedev = ctx->teedev;
    56		struct tee_shm *shm;
    57		void *ret;
    58		int rc;
    59	
    60		if (!tee_device_get(teedev))
    61			return ERR_PTR(-EINVAL);
    62	
    63		if (!teedev->pool) {
    64			/* teedev has been detached from driver */
    65			ret = ERR_PTR(-EINVAL);
    66			goto err_dev_put;
    67		}
    68	
    69		shm = kzalloc(sizeof(*shm), GFP_KERNEL);
    70		if (!shm) {
    71			ret = ERR_PTR(-ENOMEM);
    72			goto err_dev_put;
    73		}
    74	
    75		refcount_set(&shm->refcount, 1);
    76		shm->flags = flags;
    77		shm->id = id;
    78	
    79		/*
    80		 * We're assigning this as it is needed if the shm is to be
    81		 * registered. If this function returns OK then the caller expected
    82		 * to call teedev_ctx_get() or clear shm->ctx in case it's not
    83		 * needed any longer.
    84		 */
    85		shm->ctx = ctx;
    86	
    87		rc = teedev->pool->ops->alloc(teedev->pool, shm, size, align);
    88		if (rc) {
    89			ret = ERR_PTR(rc);
    90			goto err_kfree;
    91		}
    92	
    93		teedev_ctx_get(ctx);
    94		return shm;
    95	err_kfree:
    96		kfree(shm);
    97	err_dev_put:
    98		tee_device_put(teedev);
    99		return ret;
   100	}
   101	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org