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Date: Mon, 7 Aug 2023 20:34:21 +0100
From: Jonathan Cameron <jic23@...23.retrosnub.co.uk>
To: kernel test robot <lkp@...el.com>
Cc: Stefan Windfeldt-Prytz <stefan.windfeldt-prytz@...s.com>,
llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
linux-kernel@...r.kernel.org,
Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: Re: drivers/iio/light/opt4001.c:215:9: error: call to
'__compiletime_assert_355' declared with 'error' attribute: FIELD_PREP:
value too large for the field
On Sun, 6 Aug 2023 20:00:10 +0800
kernel test robot <lkp@...el.com> wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: f0ab9f34e59e0c01a1c31142e0b336245367fd86
> commit: 9a9608418292bb8733805c3f3123dfe0454fadac iio: light: Add support for TI OPT4001 light sensor
> date: 3 months ago
> config: s390-randconfig-r034-20230806 (https://download.01.org/0day-ci/archive/20230806/202308061902.0gVz6bSe-lkp@intel.com/config)
> compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
> reproduce: (https://download.01.org/0day-ci/archive/20230806/202308061902.0gVz6bSe-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202308061902.0gVz6bSe-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> In file included from drivers/iio/light/opt4001.c:16:
> In file included from include/linux/regmap.h:20:
> In file included from include/linux/iopoll.h:14:
> In file included from include/linux/io.h:13:
> In file included from arch/s390/include/asm/io.h:75:
> include/asm-generic/io.h:547:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 547 | 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]
> 560 | val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
> | ~~~~~~~~~~ ^
> include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
> 37 | #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
> | ^
> include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
> 102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
> | ^
> In file included from drivers/iio/light/opt4001.c:16:
> In file included from include/linux/regmap.h:20:
> In file included from include/linux/iopoll.h:14:
> In file included from include/linux/io.h:13:
> In file included from arch/s390/include/asm/io.h:75:
> include/asm-generic/io.h:573:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 573 | val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
> | ~~~~~~~~~~ ^
> include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
> 35 | #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
> | ^
> include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
> 115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
> | ^
> In file included from drivers/iio/light/opt4001.c:16:
> In file included from include/linux/regmap.h:20:
> In file included from include/linux/iopoll.h:14:
> In file included from include/linux/io.h:13:
> In file included from arch/s390/include/asm/io.h:75:
> include/asm-generic/io.h:584:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 584 | __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]
> 594 | __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]
> 604 | __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:692:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 692 | readsb(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:700:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 700 | readsw(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:708:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 708 | readsl(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:717:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 717 | writesb(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:726:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 726 | writesw(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> include/asm-generic/io.h:735:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 735 | writesl(PCI_IOBASE + addr, buffer, count);
> | ~~~~~~~~~~ ^
> >> drivers/iio/light/opt4001.c:215:9: error: call to '__compiletime_assert_355' declared with 'error' attribute: FIELD_PREP: value too large for the field
> 215 | reg |= FIELD_PREP(OPT4001_CTRL_CONV_TIME_MASK, chip->int_time);
> | ^
> include/linux/bitfield.h:114:3: note: expanded from macro 'FIELD_PREP'
> 114 | __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: "); \
> | ^
> include/linux/bitfield.h:68:3: note: expanded from macro '__BF_FIELD_CHECK'
> 68 | BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ? \
> | ^
> include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG'
> 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
> | ^
> note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
> include/linux/compiler_types.h:385:2: note: expanded from macro '_compiletime_assert'
> 385 | __compiletime_assert(condition, msg, prefix, suffix)
> | ^
> include/linux/compiler_types.h:378:4: note: expanded from macro '__compiletime_assert'
> 378 | prefix ## suffix(); \
> | ^
> <scratch space>:55:1: note: expanded from here
> 55 | __compiletime_assert_355
> | ^
> 12 warnings and 1 error generated.
>
>
> vim +215 drivers/iio/light/opt4001.c
>
> 207
> 208 static int opt4001_set_conf(struct opt4001_chip *chip)
> 209 {
> 210 struct device *dev = &chip->client->dev;
> 211 u16 reg;
> 212 int ret;
> 213
> 214 reg = FIELD_PREP(OPT4001_CTRL_RANGE_MASK, OPT4001_CTRL_LIGHT_SCALE_AUTO);
> > 215 reg |= FIELD_PREP(OPT4001_CTRL_CONV_TIME_MASK, chip->int_time);
> 216 reg |= FIELD_PREP(OPT4001_CTRL_OPER_MODE_MASK, OPT4001_CTRL_OPER_MODE_CONTINUOUS);
> 217
> 218 ret = regmap_write(chip->regmap, OPT4001_CTRL, reg);
> 219 if (ret)
> 220 dev_err(dev, "Failed to set configuration\n");
> 221
> 222 return ret;
> 223 }
> 224
This took me a few mins to conjecture what it might be finding.
I think it's managing to spot the missing divide by 2 in here which ends up in int_time
and could potentially go as high as 21 - overflowing the field,
static int opt4001_als_time_to_index(const u32 als_integration_time)
{
int i;
for (i = 0; i < ARRAY_SIZE(opt4001_int_time_available); i++) {
if (als_integration_time == opt4001_int_time_available[i][1])
return i;
}
return -EINVAL;
}
ARRAY_SIZE is applied to an Nx2 array so that should be ARRAY_SIZE()/2 to index over just
the first dimension as intended. I'll send a patch shortly once I've checked with the
reproducer. It's a bug either way (I think!)
Jonathan
>
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