From: bugzilla-daemon@kernel.org
To: linux-iio@vger.kernel.org
Subject: [Bug 221442] New: Compile time assert error on iio/opt4001: FIELD_PREP: value too large for the field
Date: Thu, 30 Apr 2026 16:55:17 +0000 [thread overview]
Message-ID: <bug-221442-217253@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=221442
Bug ID: 221442
Summary: Compile time assert error on iio/opt4001: FIELD_PREP:
value too large for the field
Product: Drivers
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: IIO
Assignee: drivers_iio@kernel-bugs.kernel.org
Reporter: lito.15@proton.me
Regression: No
When compiling one of the drivers (config was gotten with `zcat
/proc/config.gz` on Arch Linux), compilation fails with an assert:
```
drivers/iio/light/opt4001.c:215:9: error: call to '__compiletime_assert_528'
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:138:3: note: expanded from macro 'FIELD_PREP'
138 | __FIELD_PREP(_mask, _val, "FIELD_PREP: ");
\
| ^
./include/linux/bitfield.h:91:3: note: expanded from macro '__FIELD_PREP'
91 | __BF_FIELD_CHECK_MASK(mask, val, pfx);
\
| ^
./include/linux/bitfield.h:70:3: note: expanded from macro
'__BF_FIELD_CHECK_MASK'
70 | BUILD_BUG_ON_MSG(__builtin_constant_p(_val) ?
\
| ^
note: (skipping 2 expansions in backtrace; use -fmacro-backtrace-limit=0 to see
all)
././include/linux/compiler_types.h:694:2: note: expanded from macro
'_compiletime_assert'
694 | __compiletime_assert(condition, msg, prefix, suffix)
| ^
././include/linux/compiler_types.h:687:4: note: expanded from macro
'__compiletime_assert'
687 | prefix ## suffix();
\
| ^
<scratch space>:18:1: note: expanded from here
18 | __compiletime_assert_528
| ^
1 error generated.
make[5]: *** [scripts/Makefile.build:289: drivers/iio/light/opt4001.o] Error 1
make[4]: *** [scripts/Makefile.build:548: drivers/iio/light] Error 2
make[3]: *** [scripts/Makefile.build:548: drivers/iio] Error 2
make[2]: *** [scripts/Makefile.build:548: drivers] Error 2
make[1]: *** [/home/lito/linux-7.0.2/Makefile:2103: .] Error 2
make: *** [Makefile:248: __sub-make] Error 2
exit 2
```
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