* [jfern:nova/dev-bitstruct 8/8] warning: casts from `u8` to `u32` can be expressed infallibly using `From`
@ 2025-09-21 8:12 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2025-09-21 8:12 UTC (permalink / raw)
To: Joel Fernandes; +Cc: oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git nova/dev-bitstruct
head: 88ed8df883ccc4292779f4a55de116730bffbda3
commit: 88ed8df883ccc4292779f4a55de116730bffbda3 [8/8] rust: bitfield: Use 'as' operator for setter type conversion
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20250921/202509211019.shmVL9ew-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250921/202509211019.shmVL9ew-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509211019.shmVL9ew-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> warning: casts from `u8` to `u32` can be expressed infallibly using `From`
--> rust/kernel/bits/bitfield.rs:248:38
|
248 | { |f| <$into_type>::from(f as $type) } $into_type => $into_type $(, $comment)?;);
| ^
...
456 | / bitfield! {
457 | | struct TestWideFields: u8 {
458 | | 3:0 nibble as u32;
459 | | 7:4 high_nibble as u32;
... |
462 | | }
| |_____- in this macro invocation
|
= help: an `as` cast can become silently lossy if the types change in the future
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
= note: this warning originates in the macro `::kernel::bitfield` which comes from the expansion of the macro `bitfield` (in Nightly builds, run with -Z macro-backtrace for more info)
help: use `<$type>::from` instead
|
248 - { |f| <$into_type>::from(f as $type) } $into_type => $into_type $(, $comment)?;);
248 + { |f| <$into_type>::from(<$type>::from(f) as $type) } $into_type => $into_type $(, $comment)?;);
|
--
>> warning: casts from `bool` to `u64` can be expressed infallibly using `From`
--> rust/kernel/bits/bitfield.rs:303:26
|
303 | let value = ((value as $storage) << SHIFT) & MASK;
| ^^^^^^^^^^^^^^^^^^^
...
414 | / bitfield! {
415 | | struct TestPageTableEntry: u64 {
416 | | 0:0 present as bool;
417 | | 1:1 writable as bool;
... |
425 | | }
| |_____- in this macro invocation
|
= help: an `as` cast can become silently lossy if the types change in the future
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
= note: requested on the command line with `-W clippy::cast-lossless`
= note: this warning originates in the macro `::kernel::bitfield` which comes from the expansion of the macro `bitfield` (in Nightly builds, run with -Z macro-backtrace for more info)
help: use `<u64>::from` instead
|
303 - let value = ((value as $storage) << SHIFT) & MASK;
303 + let value = (<u64>::from(value) << SHIFT) & MASK;
|
--
>> warning: casts from `bool` to `u64` can be expressed infallibly using `From`
--> rust/kernel/bits/bitfield.rs:303:26
|
303 | let value = ((value as $storage) << SHIFT) & MASK;
| ^^^^^^^^^^^^^^^^^^^
...
414 | / bitfield! {
415 | | struct TestPageTableEntry: u64 {
416 | | 0:0 present as bool;
417 | | 1:1 writable as bool;
... |
425 | | }
| |_____- in this macro invocation
|
= help: an `as` cast can become silently lossy if the types change in the future
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
= note: this warning originates in the macro `::kernel::bitfield` which comes from the expansion of the macro `bitfield` (in Nightly builds, run with -Z macro-backtrace for more info)
help: use `<u64>::from` instead
|
303 - let value = ((value as $storage) << SHIFT) & MASK;
303 + let value = (<u64>::from(value) << SHIFT) & MASK;
|
--
>> warning: casts from `bool` to `u16` can be expressed infallibly using `From`
--> rust/kernel/bits/bitfield.rs:303:26
|
303 | let value = ((value as $storage) << SHIFT) & MASK;
| ^^^^^^^^^^^^^^^^^^^
...
427 | / bitfield! {
428 | | struct TestControlRegister: u16 {
429 | | 0:0 enable as bool;
430 | | 3:1 mode as u8;
... |
435 | | }
| |_____- in this macro invocation
|
= help: an `as` cast can become silently lossy if the types change in the future
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
= note: this warning originates in the macro `::kernel::bitfield` which comes from the expansion of the macro `bitfield` (in Nightly builds, run with -Z macro-backtrace for more info)
help: use `<u16>::from` instead
|
303 - let value = ((value as $storage) << SHIFT) & MASK;
303 + let value = (<u16>::from(value) << SHIFT) & MASK;
|
--
>> warning: casts from `bool` to `u8` can be expressed infallibly using `From`
--> rust/kernel/bits/bitfield.rs:303:26
|
303 | let value = ((value as $storage) << SHIFT) & MASK;
| ^^^^^^^^^^^^^^^^^^^
...
437 | / bitfield! {
438 | | struct TestStatusRegister: u8 {
439 | | 0:0 ready as bool;
440 | | 1:1 error as bool;
... |
445 | | }
| |_____- in this macro invocation
|
= help: an `as` cast can become silently lossy if the types change in the future
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
= note: this warning originates in the macro `::kernel::bitfield` which comes from the expansion of the macro `bitfield` (in Nightly builds, run with -Z macro-backtrace for more info)
help: use `<u8>::from` instead
|
303 - let value = ((value as $storage) << SHIFT) & MASK;
303 + let value = (<u8>::from(value) << SHIFT) & MASK;
|
--
>> warning: casts from `bool` to `u8` can be expressed infallibly using `From`
--> rust/kernel/bits/bitfield.rs:303:26
|
303 | let value = ((value as $storage) << SHIFT) & MASK;
| ^^^^^^^^^^^^^^^^^^^
...
447 | / bitfield! {
448 | | struct TestPartialBits: u8 {
449 | | 0:0 ready as bool;
450 | | 1:1 error as bool;
... |
453 | | }
| |_____- in this macro invocation
|
= help: an `as` cast can become silently lossy if the types change in the future
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
= note: this warning originates in the macro `::kernel::bitfield` which comes from the expansion of the macro `bitfield` (in Nightly builds, run with -Z macro-backtrace for more info)
help: use `<u8>::from` instead
|
303 - let value = ((value as $storage) << SHIFT) & MASK;
303 + let value = (<u8>::from(value) << SHIFT) & MASK;
|
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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