[kbuild-all] drivers/char/random.c:1269:41: warning: shift count >= width of type

tree: https://github.com/0day-ci/linux/commits/UPDATE-20210115-150503/sonicadva... 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/add9d9a623c058dd74282ae99fca6b18f... 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(a)intel.com&gt; 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); ^ 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@lists.01.org