Hi Michal, kernel test robot noticed the following build warnings: [auto build test WARNING on drm-xe/drm-xe-next] [also build test WARNING on brauner-vfs/vfs.all akpm-mm/mm-nonmm-unstable linus/master v6.12-rc7 next-20241113] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Michal-Wajdeczko/iov_iter-Provide-copy_iomem_to-from_iter/20241113-080831 base: https://gitlab.freedesktop.org/drm/xe/kernel.git drm-xe-next patch link: https://lore.kernel.org/r/20241112200454.2211-2-michal.wajdeczko%40intel.com patch subject: [PATCH v2 1/4] iov_iter: Provide copy_iomem_to|from_iter() config: x86_64-randconfig-123-20241113 (https://download.01.org/0day-ci/archive/20241114/202411140935.iEbIWcpc-lkp@xxxxxxxxx/config) compiler: gcc-12 (Debian 12.2.0-14) 12.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241114/202411140935.iEbIWcpc-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202411140935.iEbIWcpc-lkp@xxxxxxxxx/ sparse warnings: (new ones prefixed by >>) >> lib/iov_iter.c:373:47: sparse: sparse: cast removes address space '__iomem' of expression lib/iov_iter.c:386:47: sparse: sparse: cast removes address space '__iomem' of expression >> lib/iov_iter.c:349:33: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const volatile [noderef] __iomem * @@ got void * @@ lib/iov_iter.c:349:33: sparse: expected void const volatile [noderef] __iomem * lib/iov_iter.c:349:33: sparse: got void * lib/iov_iter.c:330:37: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const volatile [noderef] __iomem * @@ got void * @@ lib/iov_iter.c:330:37: sparse: expected void const volatile [noderef] __iomem * lib/iov_iter.c:330:37: sparse: got void * >> lib/iov_iter.c:362:21: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void volatile [noderef] __iomem * @@ got void *to @@ lib/iov_iter.c:362:21: sparse: expected void volatile [noderef] __iomem * lib/iov_iter.c:362:21: sparse: got void *to >> lib/iov_iter.c:338:24: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void volatile [noderef] __iomem * @@ got void * @@ lib/iov_iter.c:338:24: sparse: expected void volatile [noderef] __iomem * lib/iov_iter.c:338:24: sparse: got void * vim +/__iomem +373 lib/iov_iter.c 333 334 static __always_inline 335 size_t memcpy_iomem_from_iter(void *iter_from, size_t progress, size_t len, 336 void *to, void *priv2) 337 { > 338 memcpy_toio(to + progress, iter_from, len); 339 return 0; 340 } 341 342 static __always_inline 343 size_t copy_iomem_to_user_iter(void __user *iter_to, size_t progress, 344 size_t len, void *from, void *priv2) 345 { 346 unsigned char buf[SMP_CACHE_BYTES]; 347 size_t chunk = min(len, sizeof(buf)); 348 > 349 memcpy_fromio(buf, from + progress, chunk); 350 chunk -= copy_to_user_iter(iter_to, progress, chunk, buf, priv2); 351 return len - chunk; 352 } 353 354 static __always_inline 355 size_t copy_iomem_from_user_iter(void __user *iter_from, size_t progress, 356 size_t len, void *to, void *priv2) 357 { 358 unsigned char buf[SMP_CACHE_BYTES]; 359 size_t chunk = min(len, sizeof(buf)); 360 361 chunk -= copy_from_user_iter(iter_from, progress, chunk, buf, priv2); > 362 memcpy_toio(to, buf, chunk); 363 return len - chunk; 364 } 365 366 size_t copy_iomem_to_iter(const void __iomem *from, size_t bytes, struct iov_iter *i) 367 { 368 if (WARN_ON_ONCE(i->data_source)) 369 return 0; 370 if (user_backed_iter(i)) 371 might_fault(); 372 > 373 return iterate_and_advance(i, bytes, (void *)from, 374 copy_iomem_to_user_iter, 375 memcpy_iomem_to_iter); 376 } 377 EXPORT_SYMBOL(copy_iomem_to_iter); 378 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
