Hi Miguel, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 91265a6da44d13296bdb5b3fbafa19d06be462f2 commit: 17295a6760d551958a773a8342cff03630f3bff8 [4865/10468] Kbuild: add Rust support config: riscv-randconfig-r006-20220304 (https://download.01.org/0day-ci/archive/20220304/202203041338.Bv4qJWdU-lkp@xxxxxxxxx/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e) 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 riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=17295a6760d551958a773a8342cff03630f3bff8 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 17295a6760d551958a773a8342cff03630f3bff8 # save the config file to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false >> include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior err: false cannot find function `iounmap` in module `bindings` --> rust/kernel/io_mem.rs:225:28 | 225 | unsafe { bindings::iounmap(self.ptr as _) }; | ^^^^^^^ help: a function with a similar name exists: `ioremap` | ::: rust/bindings_helpers_generated.rs:40:5 | 40 | / pub fn ioremap( 41 | | offset: resource_size_t, 42 | | size: c_types::c_ulong, 43 | | ) -> c_types::c_void; | |______________________________- similarly named function `ioremap` defined here vim +464 include/asm-generic/io.h 3f7e212df82ca0 Arnd Bergmann 2009-05-13 450 9216efafc52ff9 Thierry Reding 2014-10-01 451 /* 9216efafc52ff9 Thierry Reding 2014-10-01 452 * {in,out}{b,w,l}() access little endian I/O. {in,out}{b,w,l}_p() can be 9216efafc52ff9 Thierry Reding 2014-10-01 453 * implemented on hardware that needs an additional delay for I/O accesses to 9216efafc52ff9 Thierry Reding 2014-10-01 454 * take effect. 9216efafc52ff9 Thierry Reding 2014-10-01 455 */ 9216efafc52ff9 Thierry Reding 2014-10-01 456 f009c89df79abe John Garry 2020-03-28 457 #if !defined(inb) && !defined(_inb) f009c89df79abe John Garry 2020-03-28 458 #define _inb _inb 214ba3584b2e2c Stafford Horne 2020-07-26 459 static inline u8 _inb(unsigned long addr) 9216efafc52ff9 Thierry Reding 2014-10-01 460 { 87fe2d543f8173 Sinan Kaya 2018-04-05 461 u8 val; 87fe2d543f8173 Sinan Kaya 2018-04-05 462 87fe2d543f8173 Sinan Kaya 2018-04-05 463 __io_pbr(); 87fe2d543f8173 Sinan Kaya 2018-04-05 @464 val = __raw_readb(PCI_IOBASE + addr); abbbbc83a210e9 Will Deacon 2019-02-22 465 __io_par(val); 87fe2d543f8173 Sinan Kaya 2018-04-05 466 return val; 9216efafc52ff9 Thierry Reding 2014-10-01 467 } 9216efafc52ff9 Thierry Reding 2014-10-01 468 #endif 9216efafc52ff9 Thierry Reding 2014-10-01 469 :::::: The code at line 464 was first introduced by commit :::::: 87fe2d543f817300e13f0ea683f38c122737856e io: change inX() to have their own IO barrier overrides :::::: TO: Sinan Kaya <okaya@xxxxxxxxxxxxxx> :::::: CC: Arnd Bergmann <arnd@xxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
