[ammarfaizi2-block:crng/random/jd/vdso 3/3] drivers/char/random.c:164:42: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int

[kernel test robot]

tree:   https://github.com/ammarfaizi2/linux-block crng/random/jd/vdso
head:   a7b31acb923dbd25e7bf030ca209f131c31f5288
commit: a7b31acb923dbd25e7bf030ca209f131c31f5288 [3/3] random: implement getrandom() in vDSO
config: arm64-buildonly-randconfig-r005-20220919 (https://download.01.org/0day-ci/archive/20220920/202209201907.0qM7YdXh-lkp@xxxxxxxxx/config)
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
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
        # install arm64 cross compiling tool for clang build
        # apt-get install binutils-aarch64-linux-gnu
        # https://github.com/ammarfaizi2/linux-block/commit/a7b31acb923dbd25e7bf030ca209f131c31f5288
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block crng/random/jd/vdso
        git checkout a7b31acb923dbd25e7bf030ca209f131c31f5288
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/char/

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

All errors (new ones prefixed by >>):

>> drivers/char/random.c:164:42: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
   DEFINE_VVAR_SINGLE(struct vdso_rng_data, _vdso_rng_data);
                                            ^
                                            int
   drivers/char/random.c:164:1: error: type specifier missing, defaults to 'int'; ISO C99 and later do not support implicit int [-Wimplicit-int]
   DEFINE_VVAR_SINGLE(struct vdso_rng_data, _vdso_rng_data);
   ^
   int
   2 errors generated.


vim +/int +164 drivers/char/random.c

   146	
   147	#define warn_unseeded_randomness() \
   148		if (IS_ENABLED(CONFIG_WARN_ALL_UNSEEDED_RANDOM) && !crng_ready()) \
   149			printk_deferred(KERN_NOTICE "random: %s called from %pS with crng_init=%d\n", \
   150					__func__, (void *)_RET_IP_, crng_init)
   151	
   152	
   153	
   154	/********************************************************************
   155	 *
   156	 * VDSO support helpers.
   157	 *
   158	 * The actual vDSO function is defined over in lib/vdso/getrandom.c,
   159	 * but this section contains the kernel-mode helpers to support that.
   160	 *
   161	 ********************************************************************/
   162	
   163	/* The shared data page. */
 > 164	DEFINE_VVAR_SINGLE(struct vdso_rng_data, _vdso_rng_data);
   165	

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