Hi Ard, I love your patch! Perhaps something to improve: [auto build test WARNING on pm/linux-next] [also build test WARNING on arm64/for-next/core arm/for-next soc/for-next v5.9-rc1 next-20200817] [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] url: https://github.com/0day-ci/linux/commits/Ard-Biesheuvel/ACPI-ioremap-avoid-redundant-rounding-to-OS-page-size/20200817-200603 base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: x86_64-randconfig-a013-20200817 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project de71b46a519db014ce906a39f8a0e1b235ef1568) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/acpi/osl.c:341:6: warning: variable 'virt' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized] if (map) { ^~~ drivers/acpi/osl.c:371:9: note: uninitialized use occurs here return virt; ^~~~ drivers/acpi/osl.c:341:2: note: remove the 'if' if its condition is always false if (map) { ^~~~~~~~~~ drivers/acpi/osl.c:326:20: note: initialize the variable 'virt' to silence this warning void __iomem *virt; ^ = NULL 1 warning generated. # https://github.com/0day-ci/linux/commit/a34cc34917319aed90ebf9b0fbf4146666f5f75d git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Ard-Biesheuvel/ACPI-ioremap-avoid-redundant-rounding-to-OS-page-size/20200817-200603 git checkout a34cc34917319aed90ebf9b0fbf4146666f5f75d vim +341 drivers/acpi/osl.c ba242d5b1a84bc Myron Stowe 2012-01-20 308 9d128ed17c672b Rafael J. Wysocki 2016-01-02 309 /** 9d128ed17c672b Rafael J. Wysocki 2016-01-02 310 * acpi_os_map_iomem - Get a virtual address for a given physical address range. 9d128ed17c672b Rafael J. Wysocki 2016-01-02 311 * @phys: Start of the physical address range to map. 9d128ed17c672b Rafael J. Wysocki 2016-01-02 312 * @size: Size of the physical address range to map. 9d128ed17c672b Rafael J. Wysocki 2016-01-02 313 * 9d128ed17c672b Rafael J. Wysocki 2016-01-02 314 * Look up the given physical address range in the list of existing ACPI memory 9d128ed17c672b Rafael J. Wysocki 2016-01-02 315 * mappings. If found, get a reference to it and return a pointer to it (its 9d128ed17c672b Rafael J. Wysocki 2016-01-02 316 * virtual address). If not found, map it, add it to that list and return a 9d128ed17c672b Rafael J. Wysocki 2016-01-02 317 * pointer to it. 9d128ed17c672b Rafael J. Wysocki 2016-01-02 318 * 8d3523fb3b7274 Lv Zheng 2016-12-14 319 * During early init (when acpi_permanent_mmap has not been set yet) this 9d128ed17c672b Rafael J. Wysocki 2016-01-02 320 * routine simply calls __acpi_map_table() to get the job done. 9d128ed17c672b Rafael J. Wysocki 2016-01-02 321 */ 9fe51603d95341 Qian Cai 2019-06-03 322 void __iomem __ref 9fe51603d95341 Qian Cai 2019-06-03 323 *acpi_os_map_iomem(acpi_physical_address phys, acpi_size size) ^1da177e4c3f41 Linus Torvalds 2005-04-16 324 { 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 325 struct acpi_ioremap *map; 620242ae8c3d9c Myron Stowe 2010-10-21 326 void __iomem *virt; 2d6d9fd3a54a28 Rafael J. Wysocki 2011-01-19 327 acpi_physical_address pg_off; 2d6d9fd3a54a28 Rafael J. Wysocki 2011-01-19 328 acpi_size pg_sz; 620242ae8c3d9c Myron Stowe 2010-10-21 329 ^1da177e4c3f41 Linus Torvalds 2005-04-16 330 if (phys > ULONG_MAX) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 331 printk(KERN_ERR PREFIX "Cannot map memory that high\n"); 70c0846e430881 Randy Dunlap 2007-02-13 332 return NULL; ^1da177e4c3f41 Linus Torvalds 2005-04-16 333 } 620242ae8c3d9c Myron Stowe 2010-10-21 334 8d3523fb3b7274 Lv Zheng 2016-12-14 335 if (!acpi_permanent_mmap) ad71860a17ba33 Alexey Starikovskiy 2007-02-02 336 return __acpi_map_table((unsigned long)phys, size); 620242ae8c3d9c Myron Stowe 2010-10-21 337 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 338 mutex_lock(&acpi_ioremap_lock); 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 339 /* Check if there's a suitable mapping already. */ 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 340 map = acpi_map_lookup(phys, size); 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 @341 if (map) { 1757659d022b73 Rafael J. Wysocki 2020-07-02 342 map->track.refcount++; 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 343 goto out; 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 344 } 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 345 620242ae8c3d9c Myron Stowe 2010-10-21 346 map = kzalloc(sizeof(*map), GFP_KERNEL); 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 347 if (!map) { 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 348 mutex_unlock(&acpi_ioremap_lock); 620242ae8c3d9c Myron Stowe 2010-10-21 349 return NULL; 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 350 } 620242ae8c3d9c Myron Stowe 2010-10-21 351 4a3cba5e72a523 Myron Stowe 2010-10-21 352 pg_off = round_down(phys, PAGE_SIZE); 4a3cba5e72a523 Myron Stowe 2010-10-21 353 pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off; a34cc34917319a Ard Biesheuvel 2020-08-17 354 virt = acpi_map(phys, size); 620242ae8c3d9c Myron Stowe 2010-10-21 355 if (!virt) { 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 356 mutex_unlock(&acpi_ioremap_lock); 620242ae8c3d9c Myron Stowe 2010-10-21 357 kfree(map); 620242ae8c3d9c Myron Stowe 2010-10-21 358 return NULL; 620242ae8c3d9c Myron Stowe 2010-10-21 359 } 620242ae8c3d9c Myron Stowe 2010-10-21 360 620242ae8c3d9c Myron Stowe 2010-10-21 361 INIT_LIST_HEAD(&map->list); a34cc34917319a Ard Biesheuvel 2020-08-17 362 map->virt = (void *)((unsigned long)virt & PAGE_MASK); 4a3cba5e72a523 Myron Stowe 2010-10-21 363 map->phys = pg_off; 4a3cba5e72a523 Myron Stowe 2010-10-21 364 map->size = pg_sz; 1757659d022b73 Rafael J. Wysocki 2020-07-02 365 map->track.refcount = 1; 620242ae8c3d9c Myron Stowe 2010-10-21 366 78cdb3ed405379 Myron Stowe 2010-10-21 367 list_add_tail_rcu(&map->list, &acpi_ioremaps); 620242ae8c3d9c Myron Stowe 2010-10-21 368 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 369 out: 7ffd0443f25024 Rafael J. Wysocki 2011-02-08 370 mutex_unlock(&acpi_ioremap_lock); a34cc34917319a Ard Biesheuvel 2020-08-17 371 return virt; ^1da177e4c3f41 Linus Torvalds 2005-04-16 372 } a238317ce81855 Lv Zheng 2014-05-20 373 EXPORT_SYMBOL_GPL(acpi_os_map_iomem); a238317ce81855 Lv Zheng 2014-05-20 374 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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