drivers/char/random.c:1269:41: warning: shift count >= width of type

drivers/char/random.c:1269:41: warning: shift count >= width of type

[kernel test robot]

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tree:   https://github.com/0day-ci/linux/commits/UPDATE-20210115-150503/sonicadvance1-gmail-com/Adds-a-new-ioctl32-syscall-for-backwards-compatibility-layers/20210106-145354
head:   add9d9a623c058dd74282ae99fca6b18fd38e800
commit: add9d9a623c058dd74282ae99fca6b18fd38e800 Adds a new ioctl32 syscall for backwards compatibility layers
date:   5 hours ago
config: mips-randconfig-r001-20210115 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5b42fd8dd4e7e29125a09a41a33af7c9cb57d144)
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 mips cross compiling tool for clang build
        # apt-get install binutils-mips-linux-gnu
        # https://github.com/0day-ci/linux/commit/add9d9a623c058dd74282ae99fca6b18fd38e800
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review UPDATE-20210115-150503/sonicadvance1-gmail-com/Adds-a-new-ioctl32-syscall-for-backwards-compatibility-layers/20210106-145354
        git checkout add9d9a623c058dd74282ae99fca6b18fd38e800
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips 

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 >>):

   In file included from drivers/char/random.c:335:
   include/linux/syscalls.h:391:5: error: unknown type name 'compat_ulong_t'
                                   compat_ulong_t arg);
                                   ^
>> drivers/char/random.c:1269:41: warning: shift count >= width of type [-Wshift-count-overflow]
           c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0;
                                                  ^  ~~
   drivers/char/random.c:2296:6: warning: no previous prototype for function 'add_hwgenerator_randomness' [-Wmissing-prototypes]
   void add_hwgenerator_randomness(const char *buffer, size_t count,
        ^
   drivers/char/random.c:2296:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void add_hwgenerator_randomness(const char *buffer, size_t count,
   ^
   static 
   2 warnings and 1 error generated.


vim +1269 drivers/char/random.c

ee3e00e9e7101c80 Theodore Ts'o     2014-06-15  1254  
775f4b297b780601 Theodore Ts'o     2012-07-02  1255  void add_interrupt_randomness(int irq, int irq_flags)
^1da177e4c3f4152 Linus Torvalds    2005-04-16  1256  {
775f4b297b780601 Theodore Ts'o     2012-07-02  1257  	struct entropy_store	*r;
1b2a1a7e8ad1144d Christoph Lameter 2014-08-17  1258  	struct fast_pool	*fast_pool = this_cpu_ptr(&irq_randomness);
775f4b297b780601 Theodore Ts'o     2012-07-02  1259  	struct pt_regs		*regs = get_irq_regs();
775f4b297b780601 Theodore Ts'o     2012-07-02  1260  	unsigned long		now = jiffies;
655b226470b22955 Theodore Ts'o     2013-09-22  1261  	cycles_t		cycles = random_get_entropy();
43759d4f429c8d55 Theodore Ts'o     2014-06-14  1262  	__u32			c_high, j_high;
655b226470b22955 Theodore Ts'o     2013-09-22  1263  	__u64			ip;
83664a6928a420b5 H. Peter Anvin    2014-03-17  1264  	unsigned long		seed;
91fcb532efe366d7 Theodore Ts'o     2014-06-10  1265  	int			credit = 0;
655b226470b22955 Theodore Ts'o     2013-09-22  1266  
ee3e00e9e7101c80 Theodore Ts'o     2014-06-15  1267  	if (cycles == 0)
ee3e00e9e7101c80 Theodore Ts'o     2014-06-15  1268  		cycles = get_reg(fast_pool, regs);
655b226470b22955 Theodore Ts'o     2013-09-22 @1269  	c_high = (sizeof(cycles) > 4) ? cycles >> 32 : 0;
655b226470b22955 Theodore Ts'o     2013-09-22  1270  	j_high = (sizeof(now) > 4) ? now >> 32 : 0;
43759d4f429c8d55 Theodore Ts'o     2014-06-14  1271  	fast_pool->pool[0] ^= cycles ^ j_high ^ irq;
43759d4f429c8d55 Theodore Ts'o     2014-06-14  1272  	fast_pool->pool[1] ^= now ^ c_high;
655b226470b22955 Theodore Ts'o     2013-09-22  1273  	ip = regs ? instruction_pointer(regs) : _RET_IP_;
43759d4f429c8d55 Theodore Ts'o     2014-06-14  1274  	fast_pool->pool[2] ^= ip;
ee3e00e9e7101c80 Theodore Ts'o     2014-06-15  1275  	fast_pool->pool[3] ^= (sizeof(ip) > 4) ? ip >> 32 :
ee3e00e9e7101c80 Theodore Ts'o     2014-06-15  1276  		get_reg(fast_pool, regs);
3060d6fe28570640 Yinghai Lu        2008-08-19  1277  
43759d4f429c8d55 Theodore Ts'o     2014-06-14  1278  	fast_mix(fast_pool);
43759d4f429c8d55 Theodore Ts'o     2014-06-14  1279  	add_interrupt_bench(cycles);
3060d6fe28570640 Yinghai Lu        2008-08-19  1280  
43838a23a05fbd13 Theodore Ts'o     2018-04-11  1281  	if (unlikely(crng_init == 0)) {
e192be9d9a30555a Theodore Ts'o     2016-06-12  1282  		if ((fast_pool->count >= 64) &&
e192be9d9a30555a Theodore Ts'o     2016-06-12  1283  		    crng_fast_load((char *) fast_pool->pool,
e192be9d9a30555a Theodore Ts'o     2016-06-12  1284  				   sizeof(fast_pool->pool))) {
e192be9d9a30555a Theodore Ts'o     2016-06-12  1285  			fast_pool->count = 0;
e192be9d9a30555a Theodore Ts'o     2016-06-12  1286  			fast_pool->last = now;
e192be9d9a30555a Theodore Ts'o     2016-06-12  1287  		}
e192be9d9a30555a Theodore Ts'o     2016-06-12  1288  		return;
e192be9d9a30555a Theodore Ts'o     2016-06-12  1289  	}
e192be9d9a30555a Theodore Ts'o     2016-06-12  1290  
840f95077ffd640d Theodore Ts'o     2014-06-14  1291  	if ((fast_pool->count < 64) &&
840f95077ffd640d Theodore Ts'o     2014-06-14  1292  	    !time_after(now, fast_pool->last + HZ))
^1da177e4c3f4152 Linus Torvalds    2005-04-16  1293  		return;
^1da177e4c3f4152 Linus Torvalds    2005-04-16  1294  
e192be9d9a30555a Theodore Ts'o     2016-06-12  1295  	r = &input_pool;
840f95077ffd640d Theodore Ts'o     2014-06-14  1296  	if (!spin_trylock(&r->lock))
91fcb532efe366d7 Theodore Ts'o     2014-06-10  1297  		return;
83664a6928a420b5 H. Peter Anvin    2014-03-17  1298  
91fcb532efe366d7 Theodore Ts'o     2014-06-10  1299  	fast_pool->last = now;
85608f8e16c28f81 Theodore Ts'o     2014-06-10  1300  	__mix_pool_bytes(r, &fast_pool->pool, sizeof(fast_pool->pool));
83664a6928a420b5 H. Peter Anvin    2014-03-17  1301  
83664a6928a420b5 H. Peter Anvin    2014-03-17  1302  	/*
83664a6928a420b5 H. Peter Anvin    2014-03-17  1303  	 * If we have architectural seed generator, produce a seed and
48d6be955a7167b0 Theodore Ts'o     2014-07-17  1304  	 * add it to the pool.  For the sake of paranoia don't let the
48d6be955a7167b0 Theodore Ts'o     2014-07-17  1305  	 * architectural seed generator dominate the input from the
48d6be955a7167b0 Theodore Ts'o     2014-07-17  1306  	 * interrupt noise.
83664a6928a420b5 H. Peter Anvin    2014-03-17  1307  	 */
83664a6928a420b5 H. Peter Anvin    2014-03-17  1308  	if (arch_get_random_seed_long(&seed)) {
85608f8e16c28f81 Theodore Ts'o     2014-06-10  1309  		__mix_pool_bytes(r, &seed, sizeof(seed));
48d6be955a7167b0 Theodore Ts'o     2014-07-17  1310  		credit = 1;
83664a6928a420b5 H. Peter Anvin    2014-03-17  1311  	}
91fcb532efe366d7 Theodore Ts'o     2014-06-10  1312  	spin_unlock(&r->lock);
83664a6928a420b5 H. Peter Anvin    2014-03-17  1313  
ee3e00e9e7101c80 Theodore Ts'o     2014-06-15  1314  	fast_pool->count = 0;
83664a6928a420b5 H. Peter Anvin    2014-03-17  1315  
ee3e00e9e7101c80 Theodore Ts'o     2014-06-15  1316  	/* award one bit for the contents of the fast pool */
ee3e00e9e7101c80 Theodore Ts'o     2014-06-15  1317  	credit_entropy_bits(r, credit + 1);
^1da177e4c3f4152 Linus Torvalds    2005-04-16  1318  }
4b44f2d18a330565 Stephan Mueller   2016-05-02  1319  EXPORT_SYMBOL_GPL(add_interrupt_randomness);
^1da177e4c3f4152 Linus Torvalds    2005-04-16  1320  

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

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