drivers/accessibility/speakup/speakup_acntpc.c:262:14: warning: performing pointer arithmetic on a null pointer has undefined behavior

From: kernel test robot
Date: Wed Feb 10 2021 - 16:41:26 EST

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Hi Samuel,

First bad commit (maybe != root cause):

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e0756cfc7d7cd08c98a53b6009c091a3f6a50be6
commit: 2067fd92d75b6d9085a43caf050bca5d88c491b8 staging/speakup: Move out of staging
date: 7 months ago
config: riscv-randconfig-r006-20210211 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476)
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@xxxxxxxxx>

All warnings (new ones prefixed by >>):

In file included from drivers/accessibility/speakup/speakup_acntpc.c:19:
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_acntpc.c:19:
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_acntpc.c:19:
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_acntpc.c:19:
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_acntpc.c:19:
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_acntpc.c:19:
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_acntpc.c:19:
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_acntpc.c:262:14: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
port_val = inw(speakup_info.port_tts - 1);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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))
^
drivers/accessibility/speakup/speakup_acntpc.c:273:15: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
port_val = inw(synth_portlist[i]) & 0xfffc;
^~~~~~~~~~~~~~~~~~~~~~
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))
^
9 warnings generated.
--
In file included from drivers/accessibility/speakup/speakup_dtlk.c:18:
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_dtlk.c:18:
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_dtlk.c:18:
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_dtlk.c:18:
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_dtlk.c:18:
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_dtlk.c:18:
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_dtlk.c:18:
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_dtlk.c:334:14: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
port_val = inw(speakup_info.port_tts - 1);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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))
^
drivers/accessibility/speakup/speakup_dtlk.c:341:15: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
port_val = inw(synth_portlist[i]) & 0xfbff;
^~~~~~~~~~~~~~~~~~~~~~
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))
^
9 warnings generated.
--
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.
..

vim +262 drivers/accessibility/speakup/speakup_acntpc.c

c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 246
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 247 static int synth_probe(struct spk_synth *synth)
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 248 {
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 249 unsigned int port_val = 0;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 250 int i = 0;
8e69a811068657 drivers/staging/speakup/speakup_acntpc.c Domagoj Trsan 2014-09-09 251
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 252 pr_info("Probing for %s.\n", synth->long_name);
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 253 if (port_forced) {
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 254 speakup_info.port_tts = port_forced;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 255 pr_info("probe forced to %x by kernel command line\n",
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 256 speakup_info.port_tts);
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 257 if (synth_request_region(speakup_info.port_tts - 1,
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 258 SYNTH_IO_EXTENT)) {
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 259 pr_warn("sorry, port already reserved\n");
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 260 return -EBUSY;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 261 }
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 @262 port_val = inw(speakup_info.port_tts - 1);
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 263 synth_port_control = speakup_info.port_tts - 1;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 264 } else {
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 265 for (i = 0; synth_portlist[i]; i++) {
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 266 if (synth_request_region(synth_portlist[i],
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 267 SYNTH_IO_EXTENT)) {
bf4a4bacb051c2 drivers/staging/speakup/speakup_acntpc.c Christopher Brannon 2010-10-14 268 pr_warn
bf4a4bacb051c2 drivers/staging/speakup/speakup_acntpc.c Christopher Brannon 2010-10-14 269 ("request_region: failed with 0x%x, %d\n",
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 270 synth_portlist[i], SYNTH_IO_EXTENT);
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 271 continue;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 272 }
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 273 port_val = inw(synth_portlist[i]) & 0xfffc;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 274 if (port_val == 0x53fc) {
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 275 /* 'S' and out&input bits */
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 276 synth_port_control = synth_portlist[i];
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 277 speakup_info.port_tts = synth_port_control + 1;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 278 break;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 279 }
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 280 }
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 281 }
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 282 port_val &= 0xfffc;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 283 if (port_val != 0x53fc) {
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 284 /* 'S' and out&input bits */
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 285 pr_info("%s: not found\n", synth->long_name);
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 286 synth_release_region(synth_port_control, SYNTH_IO_EXTENT);
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 287 synth_port_control = 0;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 288 return -ENODEV;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 289 }
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 290 pr_info("%s: %03x-%03x, driver version %s,\n", synth->long_name,
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 291 synth_port_control, synth_port_control + SYNTH_IO_EXTENT - 1,
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 292 synth->version);
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 293 synth->alive = 1;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 294 return 0;
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 295 }
c6e3fd22cd5383 drivers/staging/speakup/speakup_acntpc.c William Hubbs 2010-10-07 296

:::::: The code at line 262 was first introduced by commit
:::::: c6e3fd22cd538365bfeb82997d5b89562e077d42 Staging: add speakup to the staging directory

:::::: TO: William Hubbs <w.d.hubbs@xxxxxxxxx>
:::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxx>

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

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