Hi Samuel, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 4b6c093e21d36bede0fd88fd0aeb3b03647260e4 commit: 2067fd92d75b6d9085a43caf050bca5d88c491b8 staging/speakup: Move out of staging date: 3 weeks ago config: riscv-randconfig-s031-20200816 (attached as .config) compiler: riscv32-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-180-g49f7e13a-dirty git checkout 2067fd92d75b6d9085a43caf050bca5d88c491b8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) drivers/accessibility/speakup/serialio.c:142:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:142:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:142:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:142:9: sparse: got void * drivers/accessibility/speakup/serialio.c:144:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:144:9: sparse: got void * drivers/accessibility/speakup/serialio.c:145:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:145:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:145:9: sparse: expected void const volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:145:9: sparse: got void * drivers/accessibility/speakup/serialio.c:146:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:146:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:146:9: sparse: expected void const volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:146:9: sparse: got void * drivers/accessibility/speakup/serialio.c:147:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:147:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:147:9: sparse: expected void const volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:147:9: sparse: got void * drivers/accessibility/speakup/serialio.c:148:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:148:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:148:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:148:9: sparse: got void * drivers/accessibility/speakup/serialio.c:155:16: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:155:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:155:16: sparse: expected void const volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:155:16: sparse: got void * drivers/accessibility/speakup/serialio.c:160:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:160:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:160:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:160:9: sparse: got void * drivers/accessibility/speakup/serialio.c:165:19: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:165:19: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:165:19: sparse: expected void const volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:165:19: sparse: got void * drivers/accessibility/speakup/serialio.c:167:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:167:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:167:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:167:9: sparse: got void * drivers/accessibility/speakup/serialio.c:87:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:87:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:87:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:87:9: sparse: got void * drivers/accessibility/speakup/serialio.c:88:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:88:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:88:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:88:9: sparse: got void * drivers/accessibility/speakup/serialio.c:89:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:89:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:89:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:89:9: sparse: got void * drivers/accessibility/speakup/serialio.c:90:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:90:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:90:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:90:9: sparse: got void * drivers/accessibility/speakup/serialio.c:93:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:93:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:93:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:93:9: sparse: got void * drivers/accessibility/speakup/serialio.c:94:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:94:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:94:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:94:9: sparse: got void * drivers/accessibility/speakup/serialio.c:97:13: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:97:13: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:97:13: sparse: expected void const volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:97:13: sparse: got void * drivers/accessibility/speakup/serialio.c:208:9: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:208:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:208:9: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:208:9: sparse: got void * drivers/accessibility/speakup/serialio.c:230:16: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:230:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:230:16: sparse: expected void const volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:230:16: sparse: got void * drivers/accessibility/speakup/serialio.c:299:25: sparse: sparse: cast removes address space '__iomem' of expression drivers/accessibility/speakup/serialio.c:299:25: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ drivers/accessibility/speakup/serialio.c:299:25: sparse: expected void volatile [noderef] __iomem *addr drivers/accessibility/speakup/serialio.c:299:25: sparse: got void * drivers/accessibility/speakup/serialio.c: note: in included file (through arch/riscv/include/asm/io.h, include/linux/io.h, include/linux/irq.h, ...): include/asm-generic/io.h:556:16: sparse: sparse: cast removes address space '__iomem' of expression include/asm-generic/io.h:556:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ include/asm-generic/io.h:556:16: sparse: expected void const volatile [noderef] __iomem *addr include/asm-generic/io.h:556:16: sparse: got void * include/asm-generic/io.h:556:16: sparse: sparse: cast removes address space '__iomem' of expression include/asm-generic/io.h:556:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ include/asm-generic/io.h:556:16: sparse: expected void const volatile [noderef] __iomem *addr include/asm-generic/io.h:556:16: sparse: got void * include/asm-generic/io.h:580:9: sparse: sparse: cast removes address space '__iomem' of expression include/asm-generic/io.h:580:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ include/asm-generic/io.h:580:9: sparse: expected void volatile [noderef] __iomem *addr include/asm-generic/io.h:580:9: sparse: got void * include/asm-generic/io.h:580:9: sparse: sparse: cast removes address space '__iomem' of expression include/asm-generic/io.h:580:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void volatile [noderef] __iomem *addr @@ got void * @@ include/asm-generic/io.h:580:9: sparse: expected void volatile [noderef] __iomem *addr include/asm-generic/io.h:580:9: sparse: got void * include/asm-generic/io.h:556:16: sparse: sparse: cast removes address space '__iomem' of expression include/asm-generic/io.h:556:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ include/asm-generic/io.h:556:16: sparse: expected void const volatile [noderef] __iomem *addr include/asm-generic/io.h:556:16: sparse: got void * include/asm-generic/io.h:556:16: sparse: sparse: cast removes address space '__iomem' of expression include/asm-generic/io.h:556:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ include/asm-generic/io.h:556:16: sparse: expected void const volatile [noderef] __iomem *addr include/asm-generic/io.h:556:16: sparse: got void * include/asm-generic/io.h:556:16: sparse: sparse: cast removes address space '__iomem' of expression include/asm-generic/io.h:556:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] __iomem *addr @@ got void * @@ # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 2067fd92d75b6d9085a43caf050bca5d88c491b8 vim +/__iomem +139 drivers/accessibility/speakup/serialio.c c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 125 c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 126 static void start_serial_interrupt(int irq) c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 127 { c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 128 int rv; c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 129 114885e08c0e7d drivers/staging/speakup/serialio.c Shraddha Barke 2015-09-11 130 if (!synth->read_buff_add) c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 131 return; c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 132 c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 133 rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED, c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 134 "serial", (void *)synth_readbuf_handler); c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 135 c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 136 if (rv) 3a046c19158e89 drivers/staging/speakup/serialio.c Keerthimai Janarthanan 2014-03-18 137 pr_err("Unable to request Speakup serial I R Q\n"); c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 138 /* Set MCR */ c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 @139 outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2, c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 140 speakup_info.port_tts + UART_MCR); c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 141 /* Turn on Interrupts */ c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 142 outb(UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI, c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 143 speakup_info.port_tts + UART_IER); c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 @144 inb(speakup_info.port_tts + UART_LSR); c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 145 inb(speakup_info.port_tts + UART_RX); c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 146 inb(speakup_info.port_tts + UART_IIR); c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 147 inb(speakup_info.port_tts + UART_MSR); c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 148 outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */ c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 149 } c6e3fd22cd5383 drivers/staging/speakup/serialio.c William Hubbs 2010-10-07 150 :::::: The code at line 139 was first introduced by commit :::::: c6e3fd22cd538365bfeb82997d5b89562e077d42 Staging: add speakup to the staging directory :::::: TO: William Hubbs <w.d.hubbs(a)gmail.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)suse.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org