[Devel] [pm:acpica-osl 2/2] drivers/acpi/osl.c:402:3: warning: 'return' with no value, in function returning non-void

tree: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git acpica-osl head: 6790a0b9e44a1e8f43bef642f6adb7200ec29551 commit: 6790a0b9e44a1e8f43bef642f6adb7200ec29551 [2/2] ACPI: OSL: Add support for deferred unmapping of ACPI memory config: x86_64-rhel-7.6 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 reproduce (this is a W=1 build): git checkout 6790a0b9e44a1e8f43bef642f6adb7200ec29551 # save the attached .config to linux build tree make W=1 ARCH=x86_64 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 >>, old ones prefixed by <<): drivers/acpi/osl.c: In function 'acpi_os_vprintf': drivers/acpi/osl.c:153:2: warning: function 'acpi_os_vprintf' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 153 | vsprintf(buffer, fmt, args); | ^~~~~~~~ drivers/acpi/osl.c: In function 'acpi_os_unref_iomem': 402 | return; | ^~~~~~ drivers/acpi/osl.c:395:28: note: declared here 395 | static unsigned long __ref acpi_os_unref_iomem(void __iomem *virt, acpi_size size) | ^~~~~~~~~~~~~~~~~~~ drivers/acpi/osl.c:411:3: warning: 'return' with no value, in function returning non-void [-Wreturn-type] 411 | return; | ^~~~~~ drivers/acpi/osl.c:395:28: note: declared here 395 | static unsigned long __ref acpi_os_unref_iomem(void __iomem *virt, acpi_size size) | ^~~~~~~~~~~~~~~~~~~ vim +/return +402 drivers/acpi/osl.c 394 395 static unsigned long __ref acpi_os_unref_iomem(void __iomem *virt, acpi_size size) 396 { 397 struct acpi_ioremap *map; 398 unsigned long refcount; 399 400 if (!acpi_permanent_mmap) { 401 __acpi_unmap_table(virt, size); 403 } 404 405 mutex_lock(&acpi_ioremap_lock); 406 407 map = acpi_map_lookup_virt(virt, size); 408 if (!map) { 409 mutex_unlock(&acpi_ioremap_lock); 410 WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); 411 return; 412 } 413 refcount = acpi_os_drop_map_ref(map); 414 415 mutex_unlock(&acpi_ioremap_lock); 416 417 return refcount; 418 } 419 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org