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Date:   Tue, 5 Jan 2021 07:59:06 +0800
From:   kernel test robot <lkp@...el.com>
To:     Samuel Thibault <samuel.thibault@...-lyon.org>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: drivers/accessibility/speakup/speakup_keypc.c:268:14: warning:
 performing pointer arithmetic on a null pointer has undefined behavior

Hi Samuel,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   e71ba9452f0b5b2e8dc8aa5445198cd9214a6a62
commit: 2067fd92d75b6d9085a43caf050bca5d88c491b8 staging/speakup: Move out of staging
date:   5 months ago
config: riscv-randconfig-r034-20210105 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 98cd1c33e3c2c3cfee36fb0fea3285fda06224d3)
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/torvalds/linux.git/commit/?id=2067fd92d75b6d9085a43caf050bca5d88c491b8
        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
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/accessibility/speakup/speakup_keypc.c:17:
   In file included from drivers/accessibility/speakup/spk_priv.h:16:
   In file included from drivers/accessibility/speakup/spk_types.h:17:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:556:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return inb(addr);
                  ^~~~~~~~~
   arch/riscv/include/asm/io.h:54:76: note: expanded from macro 'inb'
   #define inb(c)          ({ u8  __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:93:48: note: expanded from macro 'readb_cpu'
   #define readb_cpu(c)            ({ u8  __r = __raw_readb(c); __r; })
                                                            ^
   In file included from drivers/accessibility/speakup/speakup_keypc.c:17:
   In file included from drivers/accessibility/speakup/spk_priv.h:16:
   In file included from drivers/accessibility/speakup/spk_types.h:17:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:564:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return inw(addr);
                  ^~~~~~~~~
   arch/riscv/include/asm/io.h:55:76: note: expanded from macro 'inw'
   #define inw(c)          ({ u16 __v; __io_pbr(); __v = readw_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:94:76: note: expanded from macro 'readw_cpu'
   #define readw_cpu(c)            ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; })
                                                                                        ^
   include/uapi/linux/byteorder/little_endian.h:36:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/accessibility/speakup/speakup_keypc.c:17:
   In file included from drivers/accessibility/speakup/spk_priv.h:16:
   In file included from drivers/accessibility/speakup/spk_types.h:17:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:572:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return inl(addr);
                  ^~~~~~~~~
   arch/riscv/include/asm/io.h:56:76: note: expanded from macro 'inl'
   #define inl(c)          ({ u32 __v; __io_pbr(); __v = readl_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:95:76: note: expanded from macro 'readl_cpu'
   #define readl_cpu(c)            ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
                                                                                        ^
   include/uapi/linux/byteorder/little_endian.h:34:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/accessibility/speakup/speakup_keypc.c:17:
   In file included from drivers/accessibility/speakup/spk_priv.h:16:
   In file included from drivers/accessibility/speakup/spk_types.h:17:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:580:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outb(value, addr);
           ^~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb'
   #define outb(v,c)       ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:97:52: note: expanded from macro 'writeb_cpu'
   #define writeb_cpu(v, c)        ((void)__raw_writeb((v), (c)))
                                                             ^
   In file included from drivers/accessibility/speakup/speakup_keypc.c:17:
   In file included from drivers/accessibility/speakup/spk_priv.h:16:
   In file included from drivers/accessibility/speakup/spk_types.h:17:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:588:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outw(value, addr);
           ^~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:59:68: note: expanded from macro 'outw'
   #define outw(v,c)       ({ __io_pbw(); writew_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:98:76: note: expanded from macro 'writew_cpu'
   #define writew_cpu(v, c)        ((void)__raw_writew((__force u16)cpu_to_le16(v), (c)))
                                                                                     ^
   In file included from drivers/accessibility/speakup/speakup_keypc.c:17:
   In file included from drivers/accessibility/speakup/spk_priv.h:16:
   In file included from drivers/accessibility/speakup/spk_types.h:17:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:596:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outl(value, addr);
           ^~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:60:68: note: expanded from macro 'outl'
   #define outl(v,c)       ({ __io_pbw(); writel_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:99:76: note: expanded from macro 'writel_cpu'
   #define writel_cpu(v, c)        ((void)__raw_writel((__force u32)cpu_to_le32(v), (c)))
                                                                                     ^
   In file included from drivers/accessibility/speakup/speakup_keypc.c:17:
   In file included from drivers/accessibility/speakup/spk_priv.h:16:
   In file included from drivers/accessibility/speakup/spk_types.h:17:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:1017:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
>> drivers/accessibility/speakup/speakup_keypc.c:268:14: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
                   port_val = inb(synth_port);
                              ^~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:54:76: note: expanded from macro 'inb'
   #define inb(c)          ({ u8  __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:93:48: note: expanded from macro 'readb_cpu'
   #define readb_cpu(c)            ({ u8  __r = __raw_readb(c); __r; })
                                                            ^
   drivers/accessibility/speakup/speakup_keypc.c:278:15: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
                           port_val = inb(synth_portlist[i]);
                                      ^~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:54:76: note: expanded from macro 'inb'
   #define inb(c)          ({ u8  __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:93:48: note: expanded from macro 'readb_cpu'
   #define readb_cpu(c)            ({ u8  __r = __raw_readb(c); __r; })
                                                            ^
   9 warnings generated.
   /tmp/speakup_keypc-d80cd4.s: Assembler messages:
   /tmp/speakup_keypc-d80cd4.s:109: Error: unrecognized opcode `zext.b a2,a1'
   /tmp/speakup_keypc-d80cd4.s:233: Error: unrecognized opcode `zext.b a0,a0'
   /tmp/speakup_keypc-d80cd4.s:392: Error: unrecognized opcode `zext.b a3,a1'
   /tmp/speakup_keypc-d80cd4.s:879: Error: unrecognized opcode `zext.b a2,s1'
   /tmp/speakup_keypc-d80cd4.s:906: Error: unrecognized opcode `zext.b s1,a0'
   /tmp/speakup_keypc-d80cd4.s:1292: Error: unrecognized opcode `zext.b a1,a1'
   /tmp/speakup_keypc-d80cd4.s:1293: Error: unrecognized opcode `zext.b a2,a2'
   /tmp/speakup_keypc-d80cd4.s:1294: Error: unrecognized opcode `zext.b a3,a3'
   /tmp/speakup_keypc-d80cd4.s:1295: Error: unrecognized opcode `zext.b a4,a0'
   clang-12: error: assembler command failed with exit code 1 (use -v to see invocation)
--
   In file included from include/linux/hardirq.h:10:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:13:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:564:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return inw(addr);
                  ^~~~~~~~~
   arch/riscv/include/asm/io.h:55:76: note: expanded from macro 'inw'
   #define inw(c)          ({ u16 __v; __io_pbr(); __v = readw_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:94:76: note: expanded from macro 'readw_cpu'
   #define readw_cpu(c)            ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; })
                                                                                        ^
   include/uapi/linux/byteorder/little_endian.h:36:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from drivers/accessibility/speakup/serialio.c:2:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:10:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:13:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:572:9: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return inl(addr);
                  ^~~~~~~~~
   arch/riscv/include/asm/io.h:56:76: note: expanded from macro 'inl'
   #define inl(c)          ({ u32 __v; __io_pbr(); __v = readl_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:95:76: note: expanded from macro 'readl_cpu'
   #define readl_cpu(c)            ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
                                                                                        ^
   include/uapi/linux/byteorder/little_endian.h:34:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from drivers/accessibility/speakup/serialio.c:2:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:10:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:13:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:580:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outb(value, addr);
           ^~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb'
   #define outb(v,c)       ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:97:52: note: expanded from macro 'writeb_cpu'
   #define writeb_cpu(v, c)        ((void)__raw_writeb((v), (c)))
                                                             ^
   In file included from drivers/accessibility/speakup/serialio.c:2:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:10:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:13:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:588:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outw(value, addr);
           ^~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:59:68: note: expanded from macro 'outw'
   #define outw(v,c)       ({ __io_pbw(); writew_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:98:76: note: expanded from macro 'writew_cpu'
   #define writew_cpu(v, c)        ((void)__raw_writew((__force u16)cpu_to_le16(v), (c)))
                                                                                     ^
   In file included from drivers/accessibility/speakup/serialio.c:2:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:10:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:13:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:596:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outl(value, addr);
           ^~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:60:68: note: expanded from macro 'outl'
   #define outl(v,c)       ({ __io_pbw(); writel_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:99:76: note: expanded from macro 'writel_cpu'
   #define writel_cpu(v, c)        ((void)__raw_writel((__force u32)cpu_to_le32(v), (c)))
                                                                                     ^
   In file included from drivers/accessibility/speakup/serialio.c:2:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:10:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:13:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:148:
   include/asm-generic/io.h:1017:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
>> drivers/accessibility/speakup/serialio.c:87:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outb(cval | UART_LCR_DLAB, ser->port + UART_LCR);       /* set DLAB */
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb'
   #define outb(v,c)       ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:97:52: note: expanded from macro 'writeb_cpu'
   #define writeb_cpu(v, c)        ((void)__raw_writeb((v), (c)))
                                                             ^
   drivers/accessibility/speakup/serialio.c:88:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outb(quot & 0xff, ser->port + UART_DLL);        /* LS of divisor */
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb'
   #define outb(v,c)       ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:97:52: note: expanded from macro 'writeb_cpu'
   #define writeb_cpu(v, c)        ((void)__raw_writeb((v), (c)))
                                                             ^
   drivers/accessibility/speakup/serialio.c:89:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outb(quot >> 8, ser->port + UART_DLM);          /* MS of divisor */
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb'
   #define outb(v,c)       ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:97:52: note: expanded from macro 'writeb_cpu'
   #define writeb_cpu(v, c)        ((void)__raw_writeb((v), (c)))
                                                             ^
   drivers/accessibility/speakup/serialio.c:90:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outb(cval, ser->port + UART_LCR);               /* reset DLAB */
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb'
   #define outb(v,c)       ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:97:52: note: expanded from macro 'writeb_cpu'
   #define writeb_cpu(v, c)        ((void)__raw_writeb((v), (c)))
                                                             ^
   drivers/accessibility/speakup/serialio.c:93:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outb(0, ser->port + UART_IER);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb'
   #define outb(v,c)       ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:97:52: note: expanded from macro 'writeb_cpu'
   #define writeb_cpu(v, c)        ((void)__raw_writeb((v), (c)))
                                                             ^
   drivers/accessibility/speakup/serialio.c:94:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:58:68: note: expanded from macro 'outb'
   #define outb(v,c)       ({ __io_pbw(); writeb_cpu((v),(void*)(PCI_IOBASE + (c))); __io_paw(); })
                                                                 ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:97:52: note: expanded from macro 'writeb_cpu'
   #define writeb_cpu(v, c)        ((void)__raw_writeb((v), (c)))
                                                             ^
   drivers/accessibility/speakup/serialio.c:97:6: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           if (inb(ser->port + UART_LSR) == 0xff) {
               ^~~~~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:54:76: note: expanded from macro 'inb'
   #define inb(c)          ({ u8  __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:93:48: note: expanded from macro 'readb_cpu'
   #define readb_cpu(c)            ({ u8  __r = __raw_readb(c); __r; })
                                                            ^
   include/linux/compiler.h:56:47: note: expanded from macro 'if'
   #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                                                 ^~~~
   include/linux/compiler.h:58:52: note: expanded from macro '__trace_if_var'
   #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                      ^~~~
   drivers/accessibility/speakup/serialio.c:97:6: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           if (inb(ser->port + UART_LSR) == 0xff) {
               ^~~~~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:54:76: note: expanded from macro 'inb'
   #define inb(c)          ({ u8  __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:93:48: note: expanded from macro 'readb_cpu'
   #define readb_cpu(c)            ({ u8  __r = __raw_readb(c); __r; })
                                                            ^
   include/linux/compiler.h:56:47: note: expanded from macro 'if'
   #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                                                 ^~~~
   include/linux/compiler.h:58:61: note: expanded from macro '__trace_if_var'
   #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                               ^~~~
   drivers/accessibility/speakup/serialio.c:97:6: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           if (inb(ser->port + UART_LSR) == 0xff) {
               ^~~~~~~~~~~~~~~~~~~~~~~~~
   arch/riscv/include/asm/io.h:54:76: note: expanded from macro 'inb'
   #define inb(c)          ({ u8  __v; __io_pbr(); __v = readb_cpu((void*)(PCI_IOBASE + (c))); __io_par(__v); __v; })
                                                                           ~~~~~~~~~~ ^
   arch/riscv/include/asm/mmio.h:93:48: note: expanded from macro 'readb_cpu'
   #define readb_cpu(c)            ({ u8  __r = __raw_readb(c); __r; })
                                                            ^
   include/linux/compiler.h:56:47: note: expanded from macro 'if'
   #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
                                                 ^~~~
   include/linux/compiler.h:58:86: note: expanded from macro '__trace_if_var'
   #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                                                        ^~~~
   include/linux/compiler.h:69:3: note: expanded from macro '__trace_if_value'
           (cond) ?                                        \
..


vim +268 drivers/accessibility/speakup/speakup_keypc.c

c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  253  
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  254  static int synth_probe(struct spk_synth *synth)
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  255  {
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  256  	unsigned int port_val = 0;
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  257  	int i = 0;
8e69a8110686572 drivers/staging/speakup/speakup_keypc.c Domagoj Trsan       2014-09-09  258  
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  259  	pr_info("Probing for %s.\n", synth->long_name);
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  260  	if (port_forced) {
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  261  		synth_port = port_forced;
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  262  		pr_info("probe forced to %x by kernel command line\n",
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  263  			synth_port);
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  264  		if (synth_request_region(synth_port - 1, SYNTH_IO_EXTENT)) {
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  265  			pr_warn("sorry, port already reserved\n");
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  266  			return -EBUSY;
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  267  		}
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07 @268  		port_val = inb(synth_port);
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  269  	} else {
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  270  		for (i = 0; synth_portlist[i]; i++) {
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  271  			if (synth_request_region(synth_portlist[i],
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  272  						 SYNTH_IO_EXTENT)) {
75d6282d8b2d58b drivers/staging/speakup/speakup_keypc.c Christopher Brannon 2010-10-14  273  				pr_warn
75d6282d8b2d58b drivers/staging/speakup/speakup_keypc.c Christopher Brannon 2010-10-14  274  				    ("request_region: failed with 0x%x, %d\n",
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  275  				     synth_portlist[i], SYNTH_IO_EXTENT);
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  276  				continue;
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  277  			}
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  278  			port_val = inb(synth_portlist[i]);
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  279  			if (port_val == 0x80) {
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  280  				synth_port = synth_portlist[i];
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  281  				break;
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  282  			}
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  283  		}
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  284  	}
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  285  	if (port_val != 0x80) {
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  286  		pr_info("%s: not found\n", synth->long_name);
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  287  		synth_release_region(synth_port, SYNTH_IO_EXTENT);
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  288  		synth_port = 0;
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  289  		return -ENODEV;
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  290  	}
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  291  	pr_info("%s: %03x-%03x, driver version %s,\n", synth->long_name,
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  292  		synth_port, synth_port + SYNTH_IO_EXTENT - 1,
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  293  		synth->version);
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  294  	synth->alive = 1;
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  295  	return 0;
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  296  }
c6e3fd22cd53836 drivers/staging/speakup/speakup_keypc.c William Hubbs       2010-10-07  297  

:::::: The code at line 268 was first introduced by commit
:::::: c6e3fd22cd538365bfeb82997d5b89562e077d42 Staging: add speakup to the staging directory

:::::: TO: William Hubbs <w.d.hubbs@...il.com>
:::::: CC: Greg Kroah-Hartman <gregkh@...e.de>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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