Hi Johannes, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: e71e3a48a7e89fa71fb70bf4602367528864d2ff commit: 68f5d3f3b6543266b29e047cfaf9842333019b4c [10919/11253] um: add PCI over virtio emulation driver config: um-allmodconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout 68f5d3f3b6543266b29e047cfaf9842333019b4c # save the attached .config to linux build tree make W=1 ARCH=um 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 >>): drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:76:15: warning: no previous prototype for '__wrap_devm_ioremap' [-Wmissing-prototypes] 76 | void __iomem *__wrap_devm_ioremap(struct device *dev, | ^~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:88:7: warning: no previous prototype for '__wrap_devm_memremap' [-Wmissing-prototypes] 88 | void *__wrap_devm_memremap(struct device *dev, resource_size_t offset, | ^~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:126:7: warning: no previous prototype for '__wrap_devm_memremap_pages' [-Wmissing-prototypes] 126 | void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:159:7: warning: no previous prototype for '__wrap_phys_to_pfn_t' [-Wmissing-prototypes] 159 | pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags) | ^~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:169:7: warning: no previous prototype for '__wrap_memremap' [-Wmissing-prototypes] 169 | void *__wrap_memremap(resource_size_t offset, size_t size, | ^~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:180:6: warning: no previous prototype for '__wrap_devm_memunmap' [-Wmissing-prototypes] 180 | void __wrap_devm_memunmap(struct device *dev, void *addr) | ^~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:190:15: warning: no previous prototype for '__wrap_ioremap' [-Wmissing-prototypes] 190 | void __iomem *__wrap_ioremap(resource_size_t offset, unsigned long size) | ^~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:196:15: warning: no previous prototype for '__wrap_ioremap_wc' [-Wmissing-prototypes] 196 | void __iomem *__wrap_ioremap_wc(resource_size_t offset, unsigned long size) | ^~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c: In function '__wrap_iounmap': 207 | return iounmap(addr); | ^~~~ In file included from arch/um/include/asm/io.h:7, from include/linux/io.h:13, from drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:13: include/asm-generic/logic_io.h:37:28: note: expected 'void *' but argument is of type 'volatile void *' 37 | void iounmap(void __iomem *addr); | ~~~~~~~~~~~~~~^~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c: At top level: drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:211:6: warning: no previous prototype for '__wrap_memunmap' [-Wmissing-prototypes] 211 | void __wrap_memunmap(void *addr) | ^~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:347:18: warning: no previous prototype for '__wrap___request_region' [-Wmissing-prototypes] 347 | struct resource *__wrap___request_region(struct resource *parent, | ^~~~~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:355:5: warning: no previous prototype for '__wrap_insert_resource' [-Wmissing-prototypes] 355 | int __wrap_insert_resource(struct resource *parent, struct resource *res) | ^~~~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:363:5: warning: no previous prototype for '__wrap_remove_resource' [-Wmissing-prototypes] 363 | int __wrap_remove_resource(struct resource *res) | ^~~~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:371:18: warning: no previous prototype for '__wrap___devm_request_region' [-Wmissing-prototypes] 371 | struct resource *__wrap___devm_request_region(struct device *dev, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:381:6: warning: no previous prototype for '__wrap___release_region' [-Wmissing-prototypes] 381 | void __wrap___release_region(struct resource *parent, resource_size_t start, | ^~~~~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:389:6: warning: no previous prototype for '__wrap___devm_release_region' [-Wmissing-prototypes] 389 | void __wrap___devm_release_region(struct device *dev, struct resource *parent, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:397:13: warning: no previous prototype for '__wrap_acpi_evaluate_object' [-Wmissing-prototypes] 397 | acpi_status __wrap_acpi_evaluate_object(acpi_handle handle, acpi_string path, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c:413:21: warning: no previous prototype for '__wrap_acpi_evaluate_dsm' [-Wmissing-prototypes] 413 | union acpi_object * __wrap_acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid, | ^~~~~~~~~~~~~~~~~~~~~~~~ vim +207 drivers/nvdimm/../../tools/testing/nvdimm/test/iomap.c 9d27a87ec9e131 Dan Williams 2015-07-10 201 6bc756193ff61b Dan Williams 2015-06-17 202 void __wrap_iounmap(volatile void __iomem *addr) 6bc756193ff61b Dan Williams 2015-06-17 203 { 9bfa84969dd52b Dan Williams 2015-12-11 204 struct nfit_test_resource *nfit_res = get_nfit_res((long) addr); 6bc756193ff61b Dan Williams 2015-06-17 205 if (nfit_res) 6bc756193ff61b Dan Williams 2015-06-17 206 return; 6bc756193ff61b Dan Williams 2015-06-17 @207 return iounmap(addr); 6bc756193ff61b Dan Williams 2015-06-17 208 } 6bc756193ff61b Dan Williams 2015-06-17 209 EXPORT_SYMBOL(__wrap_iounmap); 6bc756193ff61b Dan Williams 2015-06-17 210 :::::: The code at line 207 was first introduced by commit :::::: 6bc756193ff61bf5e7b3cfedfbb0873bf40f8055 tools/testing/nvdimm: libnvdimm unit test infrastructure :::::: TO: Dan Williams <dan.j.williams(a)intel.com&gt; :::::: CC: Dan Williams <dan.j.williams(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org