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Date: Tue, 18 Oct 2022 08:26:16 +0800
From: kernel test robot <lkp@...el.com>
To: "Maciej W. Rozycki" <macro@...am.me.uk>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org, Palmer Dabbelt <palmer@...osinc.com>,
Arnd Bergmann <arnd@...db.de>
Subject: drivers/iio/adc/ad7606_par.c:24:2: warning: performing pointer
arithmetic on a null pointer has undefined behavior
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: bbb8ceb5e2421184db9560e9d2cfaf858e1db616
commit: 9cc205e3c17d5716da7ebb7fa0c985555e95d009 RISC-V: Make port I/O string accessors actually work
date: 4 days ago
config: riscv-buildonly-randconfig-r001-20221017
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
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=9cc205e3c17d5716da7ebb7fa0c985555e95d009
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout 9cc205e3c17d5716da7ebb7fa0c985555e95d009
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/iio/adc/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
In file included from drivers/iio/adc/ad7606_par.c:13:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:560:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
^
In file included from drivers/iio/adc/ad7606_par.c:13:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
^
In file included from drivers/iio/adc/ad7606_par.c:13:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:594:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:604:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:743:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insb(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb'
#define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/iio/adc/ad7606_par.c:13:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:751:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insw(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw'
#define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/iio/adc/ad7606_par.c:13:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:759:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insl(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:106:53: note: expanded from macro 'insl'
#define insl(addr, buffer, count) __insl(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/iio/adc/ad7606_par.c:13:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:768:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsb(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb'
#define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/iio/adc/ad7606_par.c:13:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:777:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsw(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw'
#define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/iio/adc/ad7606_par.c:13:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:786:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
outsl(addr, buffer, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:120:55: note: expanded from macro 'outsl'
#define outsl(addr, buffer, count) __outsl(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
In file included from drivers/iio/adc/ad7606_par.c:13:
In file included from include/linux/io.h:13:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:1134:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
~~~~~~~~~~ ^
>> drivers/iio/adc/ad7606_par.c:24:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insw((unsigned long)st->base_address, buf, count);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw'
#define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
drivers/iio/adc/ad7606_par.c:39:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
insb((unsigned long)st->base_address, buf, count * 2);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb'
#define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count)
~~~~~~~~~~ ^
15 warnings generated.
vim +24 drivers/iio/adc/ad7606_par.c
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 17
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 18 static int ad7606_par16_read_block(struct device *dev,
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 19 int count, void *buf)
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 20 {
dae013afa72311 drivers/staging/iio/adc/ad7606_par.c Wolfram Sang 2018-04-19 21 struct iio_dev *indio_dev = dev_get_drvdata(dev);
e61181d0a3e678 drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-05-18 22 struct ad7606_state *st = iio_priv(indio_dev);
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 23
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 @24 insw((unsigned long)st->base_address, buf, count);
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 25
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 26 return 0;
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 27 }
b9618c0cacd7cf drivers/staging/iio/adc/ad7606_par.c Michael Hennerich 2011-02-22 28
:::::: The code at line 24 was first introduced by commit
:::::: b9618c0cacd7cf56cc3d073c1e9e9a8a3a12864e staging: IIO: ADC: New driver for AD7606/AD7606-6/AD7606-4
:::::: TO: Michael Hennerich <michael.hennerich@...log.com>
:::::: CC: Greg Kroah-Hartman <gregkh@...e.de>
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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