tree: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git acpica-osl head: 3537ee81aa84bbcf47f7239f1053686d71bea47d commit: 3537ee81aa84bbcf47f7239f1053686d71bea47d [3/3] ACPI: OSL: Define ACPI_OS_MAP_MEMORY_FAST_PATH() config: i386-randconfig-m021-20200611 (attached as .config) compiler: gcc-9 (Debian 9.3.0-13) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: drivers/acpi/osl.c:1608 acpi_release_memory() warn: ignoring unreachable code. # https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commi... git remote add pm https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git git remote update pm git checkout 3537ee81aa84bbcf47f7239f1053686d71bea47d vim +1608 drivers/acpi/osl.c d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1599 acpi_status acpi_release_memory(acpi_handle handle, struct resource *res, d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1600 u32 level) d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1601 { d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1602 if (!(res->flags & IORESOURCE_MEM)) d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1603 return AE_TYPE; d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1604 d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1605 return acpi_walk_namespace(ACPI_TYPE_REGION, handle, level, ^^^^^^ d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1606 acpi_deactivate_mem_region, NULL, res, NULL); 3537ee81aa84bb Rafael J. Wysocki 2020-06-10 1607 3537ee81aa84bb Rafael J. Wysocki 2020-06-10 @1608 acpi_release_unused_memory_mappings(); ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Unreachable. d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1609 } d2d2e3c46be5d6 Heikki Krogerus 2018-06-21 1610 EXPORT_SYMBOL_GPL(acpi_release_memory); --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org