From: kernel test robot <lkp@intel.com>
To: Yimin Gu <ustcymgu@gmail.com>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev,
Linux Memory Management List <linux-mm@kvack.org>,
Palmer Dabbelt <palmer@rivosinc.com>,
Jesse Taube <Mr.Bossman075@gmail.com>,
Damien Le Moal <damien.lemoal@opensource.wdc.com>,
Conor Dooley <conor.dooley@microchip.com>
Subject: [linux-next:master 6260/13289] drivers/net/arcnet/com20020.c:74:7: warning: performing pointer arithmetic on a null pointer has undefined behavior
Date: Sat, 22 Apr 2023 02:00:09 +0800 [thread overview]
Message-ID: <202304220118.NYuW8ip0-lkp@intel.com> (raw)
Hi Yimin,
FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 44bf136283e567b2b62653be7630e7511da41da2
commit: b5e2c507b06c9d36411845149162a804ae7b04a9 [6260/13289] riscv: Kconfig: Allow RV32 to build with no MMU
config: riscv-randconfig-r024-20230421 (https://download.01.org/0day-ci/archive/20230422/202304220118.NYuW8ip0-lkp@intel.com/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 437b7602e4a998220871de78afcb020b9c14a661)
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-riscv-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=b5e2c507b06c9d36411845149162a804ae7b04a9
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 b5e2c507b06c9d36411845149162a804ae7b04a9
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash drivers/net/arcnet/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304220118.NYuW8ip0-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
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: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/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
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: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/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
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: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/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
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: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/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
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: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/net/arcnet/com20020.c:37:
In file included from include/linux/netdevice.h:38:
In file included from include/net/net_namespace.h:43:
In file included from include/linux/skbuff.h:17:
In file included from include/linux/bvec.h:10:
In file included from include/linux/highmem.h:12:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
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: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/net/arcnet/com20020.c:74:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/arcnet/arcdevice.h:389:2: note: expanded from macro 'arcnet_insb'
insb((addr) + BUS_ALIGN * (offset), 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)
~~~~~~~~~~ ^
drivers/net/arcnet/arcdevice.h:103:3: note: expanded from macro 'TIME'
call; \
^~~~
>> drivers/net/arcnet/com20020.c:74:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/arcnet/arcdevice.h:389:2: note: expanded from macro 'arcnet_insb'
insb((addr) + BUS_ALIGN * (offset), 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)
~~~~~~~~~~ ^
drivers/net/arcnet/arcdevice.h:110:3: note: expanded from macro 'TIME'
call; \
^~~~
drivers/net/arcnet/com20020.c:88:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/arcnet/arcdevice.h:391:2: note: expanded from macro 'arcnet_outsb'
outsb((addr) + BUS_ALIGN * (offset), 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)
~~~~~~~~~~ ^
drivers/net/arcnet/arcdevice.h:103:3: note: expanded from macro 'TIME'
call; \
^~~~
drivers/net/arcnet/com20020.c:88:7: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/net/arcnet/arcdevice.h:391:2: note: expanded from macro 'arcnet_outsb'
outsb((addr) + BUS_ALIGN * (offset), 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)
~~~~~~~~~~ ^
drivers/net/arcnet/arcdevice.h:110:3: note: expanded from macro 'TIME'
call; \
^~~~
17 warnings generated.
vim +74 drivers/net/arcnet/com20020.c
^1da177e4c3f41 Linus Torvalds 2005-04-16 61
^1da177e4c3f41 Linus Torvalds 2005-04-16 62 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
^1da177e4c3f41 Linus Torvalds 2005-04-16 63 int offset, void *buf, int count)
^1da177e4c3f41 Linus Torvalds 2005-04-16 64 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 65 int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;
^1da177e4c3f41 Linus Torvalds 2005-04-16 66
^1da177e4c3f41 Linus Torvalds 2005-04-16 67 /* set up the address register */
0fec65130b9f11 Joe Perches 2015-05-05 68 arcnet_outb((ofs >> 8) | RDDATAflag | AUTOINCflag,
0fec65130b9f11 Joe Perches 2015-05-05 69 ioaddr, COM20020_REG_W_ADDR_HI);
0fec65130b9f11 Joe Perches 2015-05-05 70 arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);
^1da177e4c3f41 Linus Torvalds 2005-04-16 71
^1da177e4c3f41 Linus Torvalds 2005-04-16 72 /* copy the data */
0fec65130b9f11 Joe Perches 2015-05-05 73 TIME(dev, "insb", count,
0fec65130b9f11 Joe Perches 2015-05-05 @74 arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
^1da177e4c3f41 Linus Torvalds 2005-04-16 75 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 76
:::::: The code at line 74 was first introduced by commit
:::::: 0fec65130b9f11a73d74f47025491f97f82ba070 arcnet: com20020: Use arcnet_<I/O> routines
:::::: TO: Joe Perches <joe@perches.com>
:::::: CC: Michael Grzeschik <m.grzeschik@pengutronix.de>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
reply other threads:[~2023-04-21 18:00 UTC|newest]
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