_BITOPS_LONG_SHIFT seems to be x86-specific. I'll get rid of it.

I'm also looking into a separate problem with 64-bit divisions. I've reproduced that with a 32-bit build. As I understand it, u64 / u64 should be OK, but for some reason it's doing a signed division somewhere. I'm trying to track that down. It's somewhere in the hash table statistics code. A build that disables statistics doesn't have a problem.

Regards,   Felix

On 2017-09-19 01:42 AM, kbuild test robot wrote:

tree: git://people.freedesktop.org/~agd5f/linux.git amd-staging-drm-next head: dcae401d111324489c066aa57ed9c77b97b475f9 commit: 18c073719186a393b41715686cf95175c58919df [1046/1053] drm/amd: Closed hash table with low overhead config: ia64-allyesconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 6.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 18c073719186a393b41715686cf95175c58919df # save the attached .config to linux build tree make.cross ARCH=ia64

All error/warnings (new ones prefixed by >>):

In file included from drivers/gpu//drm/amd/lib/chash.c:30:0: drivers/gpu//drm/amd/lib/../include/linux/chash.h: In function 'chash_iter_is_valid':

...

...

drivers/gpu//drm/amd/lib/../include/linux/chash.h:286:50: error: '_BITOPS_LONG_SHIFT' undeclared (first use in this function)

 return !!(iter.table->valid_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] &
                                                 ^~~~~~~~~~~~~~~~~~

drivers/gpu//drm/amd/lib/../include/linux/chash.h:286:50: note: each undeclared identifier is reported only once for each function it appears in drivers/gpu//drm/amd/lib/../include/linux/chash.h: In function 'chash_iter_is_empty': drivers/gpu//drm/amd/lib/../include/linux/chash.h:292:49: error: '_BITOPS_LONG_SHIFT' undeclared (first use in this function) return !(iter.table->occup_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] & ^~~~~~~~~~~~~~~~~~ drivers/gpu//drm/amd/lib/../include/linux/chash.h: In function 'chash_iter_set_valid': drivers/gpu//drm/amd/lib/../include/linux/chash.h:299:40: error: '_BITOPS_LONG_SHIFT' undeclared (first use in this function) iter.table->valid_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] |= iter.mask; ^~~~~~~~~~~~~~~~~~ drivers/gpu//drm/amd/lib/../include/linux/chash.h: In function 'chash_iter_set_invalid': drivers/gpu//drm/amd/lib/../include/linux/chash.h:305:40: error: '_BITOPS_LONG_SHIFT' undeclared (first use in this function) iter.table->valid_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] &= ~iter.mask; ^~~~~~~~~~~~~~~~~~ drivers/gpu//drm/amd/lib/../include/linux/chash.h: In function 'chash_iter_set_empty': drivers/gpu//drm/amd/lib/../include/linux/chash.h:310:40: error: '_BITOPS_LONG_SHIFT' undeclared (first use in this function) iter.table->occup_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] &= ~iter.mask; ^~~~~~~~~~~~~~~~~~ drivers/gpu//drm/amd/lib/../include/linux/chash.h: In function 'chash_iter_is_valid':

...

...

drivers/gpu//drm/amd/lib/../include/linux/chash.h:288:1: warning: control reaches end of non-void function [-Wreturn-type]

}
^

drivers/gpu//drm/amd/lib/../include/linux/chash.h: In function 'chash_iter_is_empty': drivers/gpu//drm/amd/lib/../include/linux/chash.h:294:1: warning: control reaches end of non-void function [-Wreturn-type] } ^

vim +/_BITOPS_LONG_SHIFT +286 drivers/gpu//drm/amd/lib/../include/linux/chash.h

252 253 /** 254 * CHASH_ITER_INIT - Initialize a hash table iterator 255 * @tbl: Pointer to hash table to iterate over 256 * @s: Initial slot number 257 */ 258 #define CHASH_ITER_INIT(table, s) { \ 259 table, \ 260 1UL << ((s) & (BITS_PER_LONG - 1)), \ 261 s \ 262 } 263 /** 264 * CHASH_ITER_SET - Set hash table iterator to new slot 265 * @iter: Iterator 266 * @s: Slot number 267 */ 268 #define CHASH_ITER_SET(iter, s) \ 269 (iter).mask = 1UL << ((s) & (BITS_PER_LONG - 1)), \ 270 (iter).slot = (s) 271 /** 272 * CHASH_ITER_INC - Increment hash table iterator 273 * @table: Hash table to iterate over 274 * 275 * Wraps around at the end. 276 */ 277 #define CHASH_ITER_INC(iter) do { \ 278 (iter).mask = (iter).mask << 1 | \ 279 (iter).mask >> (BITS_PER_LONG - 1); \ 280 (iter).slot = ((iter).slot + 1) & (iter).table->size_mask; \ 281 } while (0) 282 283 static inline bool chash_iter_is_valid(const struct chash_iter iter) 284 { 285 BUG_ON((unsigned)iter.slot >= (1 << iter.table->bits));

...

286 return !!(iter.table->valid_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] &

287 iter.mask);

...

288 }

289 static inline bool chash_iter_is_empty(const struct chash_iter iter) 290 { 291 BUG_ON((unsigned)iter.slot >= (1 << iter.table->bits)); 292 return !(iter.table->occup_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] & 293 iter.mask); 294 } 295 296 static inline void chash_iter_set_valid(const struct chash_iter iter) 297 { 298 BUG_ON((unsigned)iter.slot >= (1 << iter.table->bits)); 299 iter.table->valid_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] |= iter.mask; 300 iter.table->occup_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] |= iter.mask; 301 } 302 static inline void chash_iter_set_invalid(const struct chash_iter iter) 303 { 304 BUG_ON((unsigned)iter.slot >= (1 << iter.table->bits));

...

305 iter.table->valid_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] &= ~iter.mask;

306 } 307 static inline void chash_iter_set_empty(const struct chash_iter iter) 308 { 309 BUG_ON((unsigned)iter.slot >= (1 << iter.table->bits)); 310 iter.table->occup_bitmap[iter.slot >> _BITOPS_LONG_SHIFT] &= ~iter.mask; 311 } 312

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