* [boqun:rust-sync.20260105a 18/22] error[E0277]: the trait bound `i8: AtomicImpl` is not satisfied
@ 2026-01-05 16:25 kernel test robot
2026-01-06 0:49 ` Boqun Feng
0 siblings, 1 reply; 2+ messages in thread
From: kernel test robot @ 2026-01-05 16:25 UTC (permalink / raw)
To: FUJITA Tomonori; +Cc: llvm, oe-kbuild-all, Boqun Feng
tree: https://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git rust-sync.20260105a
head: 243aa6a057d46d3a4de9297422e480d469eddaf7
commit: 06ed7e7e7aa656f7054af7d3d3387a07244d85b1 [18/22] rust: sync: atomic: Add i8/i16 xchg and cmpxchg support
config: um-randconfig-001-20260105 (https://download.01.org/0day-ci/archive/20260106/202601060041.k0JkAkUD-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260106/202601060041.k0JkAkUD-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/202601060041.k0JkAkUD-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from kernel/sched/rq-offsets.c:5:
In file included from kernel/sched/sched.h:28:
In file included from include/linux/cgroup_api.h:1:
In file included from include/linux/cgroup.h:27:
In file included from include/linux/kernel_stat.h:8:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from arch/um/include/asm/hardirq.h:24:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/um/include/asm/io.h:24:
include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
1209 | return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
| ~~~~~~~~~~ ^
1 warning generated.
llvm-nm: error: rust/helpers/helpers.o: No such file or directory
clang diag: include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
clang diag: include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
clang diag: include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>> error[E0277]: the trait bound `i8: AtomicImpl` is not satisfied
--> rust/kernel/sync/atomic/internal.rs:265:7
|
265 | [ i8 => atomic_i8, i16 => atomic_i16, i32 => atomic, i64 => atomic64 ]
| ^^ the trait `AtomicImpl` is not implemented for `i8`
|
= help: the following other types implement trait `AtomicImpl`:
i32
i64
note: required by a bound in `AtomicBasicOps`
--> rust/kernel/sync/atomic/internal.rs:190:26
|
190 | $pub trait $ops: AtomicImpl {
| ^^^^^^^^^^ required by this bound in `AtomicBasicOps`
...
264 | / declare_and_impl_atomic_methods!(
265 | | [ i8 => atomic_i8, i16 => atomic_i16, i32 => atomic, i64 => atomic64 ]
266 | | /// Basic atomic operations
267 | | pub trait AtomicBasicOps {
| | -------------- required by a bound in this trait
... |
280 | | );
| |_- in this macro invocation
= note: this error originates in the macro `declare_atomic_ops_trait` which comes from the expansion of the macro `declare_and_impl_atomic_methods` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error[E0277]: the trait bound `i16: AtomicImpl` is not satisfied
--> rust/kernel/sync/atomic/internal.rs:265:24
|
265 | [ i8 => atomic_i8, i16 => atomic_i16, i32 => atomic, i64 => atomic64 ]
| ^^^ the trait `AtomicImpl` is not implemented for `i16`
|
= help: the following other types implement trait `AtomicImpl`:
i32
i64
note: required by a bound in `AtomicBasicOps`
--> rust/kernel/sync/atomic/internal.rs:190:26
|
190 | $pub trait $ops: AtomicImpl {
| ^^^^^^^^^^ required by this bound in `AtomicBasicOps`
...
264 | / declare_and_impl_atomic_methods!(
265 | | [ i8 => atomic_i8, i16 => atomic_i16, i32 => atomic, i64 => atomic64 ]
266 | | /// Basic atomic operations
267 | | pub trait AtomicBasicOps {
| | -------------- required by a bound in this trait
... |
280 | | );
| |_- in this macro invocation
= note: this error originates in the macro `declare_atomic_ops_trait` which comes from the expansion of the macro `declare_and_impl_atomic_methods` (in Nightly builds, run with -Z macro-backtrace for more info)
--
>> error[E0277]: the trait bound `i16: AtomicImpl` is not satisfied
--> rust/kernel/sync/atomic/internal.rs:289:48
|
289 | fn xchg[acquire, release, relaxed](a: &AtomicRepr<Self>, v: Self) -> Self {
| ^^^^^^^^^^^^^^^^ the trait `AtomicImpl` is not implemented for `i16`
|
= help: the following other types implement trait `AtomicImpl`:
i32
i64
note: required by a bound in `AtomicRepr`
--> rust/kernel/sync/atomic/internal.rs:66:26
|
66 | pub struct AtomicRepr<T: AtomicImpl>(UnsafeCell<T>);
| ^^^^^^^^^^ required by this bound in `AtomicRepr`
--
>> error[E0277]: the trait bound `i16: AtomicImpl` is not satisfied
--> rust/kernel/sync/atomic/internal.rs:301:17
|
301 | a: &AtomicRepr<Self>, old: &mut Self, new: Self
| ^^^^^^^^^^^^^^^^ the trait `AtomicImpl` is not implemented for `i16`
|
= help: the following other types implement trait `AtomicImpl`:
i32
i64
note: required by a bound in `AtomicRepr`
--> rust/kernel/sync/atomic/internal.rs:66:26
|
66 | pub struct AtomicRepr<T: AtomicImpl>(UnsafeCell<T>);
| ^^^^^^^^^^ required by this bound in `AtomicRepr`
--
>> error[E0277]: the trait bound `i8: AtomicImpl` is not satisfied
--> rust/kernel/sync/atomic/predefine.rs:11:17
|
11 | type Repr = i8;
| ^^ the trait `AtomicImpl` is not implemented for `i8`
|
= help: the following other types implement trait `AtomicImpl`:
i32
i64
note: required by a bound in `AtomicType::Repr`
--> rust/kernel/sync/atomic.rs:113:16
|
113 | type Repr: AtomicImpl;
| ^^^^^^^^^^ required by this bound in `AtomicType::Repr`
--
>> error[E0277]: the trait bound `i16: AtomicImpl` is not satisfied
--> rust/kernel/sync/atomic/predefine.rs:17:17
|
17 | type Repr = i16;
| ^^^ the trait `AtomicImpl` is not implemented for `i16`
|
= help: the following other types implement trait `AtomicImpl`:
i32
i64
note: required by a bound in `AtomicType::Repr`
--> rust/kernel/sync/atomic.rs:113:16
|
113 | type Repr: AtomicImpl;
| ^^^^^^^^^^ required by this bound in `AtomicType::Repr`
--
>> error[E0599]: the method `as_ptr` exists for reference `&AtomicRepr<i8>`, but its trait bounds were not satisfied
--> rust/kernel/sync/atomic/internal.rs:271:40
|
271 | unsafe { bindings::#call(a.as_ptr().cast()) }
| ^^^^^^ method cannot be called on `&AtomicRepr<i8>` due to unsatisfied trait bounds
|
note: trait bound `i8: AtomicImpl` was not satisfied
--> rust/kernel/sync/atomic/internal.rs:68:9
|
68 | impl<T: AtomicImpl> AtomicRepr<T> {
| ^^^^^^^^^^ -------------
| |
| unsatisfied trait bound introduced here
= help: items from traits can only be used if the trait is implemented and in scope
note: `device_id::IdTable` defines an item `as_ptr`, perhaps you need to implement it
--> rust/kernel/device_id.rs:165:1
|
165 | pub trait IdTable<T: RawDeviceId, U> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
--
>> error[E0599]: the method `as_ptr` exists for reference `&AtomicRepr<i8>`, but its trait bounds were not satisfied
--> rust/kernel/sync/atomic/internal.rs:277:40
|
277 | unsafe { bindings::#call(a.as_ptr().cast(), v) }
| ^^^^^^ method cannot be called on `&AtomicRepr<i8>` due to unsatisfied trait bounds
|
note: trait bound `i8: AtomicImpl` was not satisfied
--> rust/kernel/sync/atomic/internal.rs:68:9
|
68 | impl<T: AtomicImpl> AtomicRepr<T> {
| ^^^^^^^^^^ -------------
| |
| unsatisfied trait bound introduced here
= help: items from traits can only be used if the trait is implemented and in scope
note: `device_id::IdTable` defines an item `as_ptr`, perhaps you need to implement it
--> rust/kernel/device_id.rs:165:1
|
165 | pub trait IdTable<T: RawDeviceId, U> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
--
>> error[E0599]: the method `as_ptr` exists for reference `&AtomicRepr<i16>`, but its trait bounds were not satisfied
--> rust/kernel/sync/atomic/internal.rs:271:40
|
271 | unsafe { bindings::#call(a.as_ptr().cast()) }
| ^^^^^^ method cannot be called on `&AtomicRepr<i16>` due to unsatisfied trait bounds
|
note: trait bound `i16: AtomicImpl` was not satisfied
--> rust/kernel/sync/atomic/internal.rs:68:9
|
68 | impl<T: AtomicImpl> AtomicRepr<T> {
| ^^^^^^^^^^ -------------
| |
| unsatisfied trait bound introduced here
= help: items from traits can only be used if the trait is implemented and in scope
note: `device_id::IdTable` defines an item `as_ptr`, perhaps you need to implement it
--> rust/kernel/device_id.rs:165:1
|
165 | pub trait IdTable<T: RawDeviceId, U> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
--
>> error[E0599]: the method `as_ptr` exists for reference `&AtomicRepr<i16>`, but its trait bounds were not satisfied
--> rust/kernel/sync/atomic/internal.rs:277:40
|
277 | unsafe { bindings::#call(a.as_ptr().cast(), v) }
| ^^^^^^ method cannot be called on `&AtomicRepr<i16>` due to unsatisfied trait bounds
|
note: trait bound `i16: AtomicImpl` was not satisfied
--> rust/kernel/sync/atomic/internal.rs:68:9
|
68 | impl<T: AtomicImpl> AtomicRepr<T> {
| ^^^^^^^^^^ -------------
| |
| unsatisfied trait bound introduced here
= help: items from traits can only be used if the trait is implemented and in scope
note: `device_id::IdTable` defines an item `as_ptr`, perhaps you need to implement it
--> rust/kernel/device_id.rs:165:1
|
165 | pub trait IdTable<T: RawDeviceId, U> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
--
>> error[E0599]: the method `as_ptr` exists for reference `&AtomicRepr<i8>`, but its trait bounds were not satisfied
--> rust/kernel/sync/atomic/internal.rs:291:40
|
291 | unsafe { bindings::#call(a.as_ptr().cast(), v) }
| ^^^^^^ method cannot be called on `&AtomicRepr<i8>` due to unsatisfied trait bounds
|
note: trait bound `i8: AtomicImpl` was not satisfied
--> rust/kernel/sync/atomic/internal.rs:68:9
|
68 | impl<T: AtomicImpl> AtomicRepr<T> {
| ^^^^^^^^^^ -------------
| |
| unsatisfied trait bound introduced here
= help: items from traits can only be used if the trait is implemented and in scope
note: `device_id::IdTable` defines an item `as_ptr`, perhaps you need to implement it
--> rust/kernel/device_id.rs:165:1
|
165 | pub trait IdTable<T: RawDeviceId, U> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
..
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [boqun:rust-sync.20260105a 18/22] error[E0277]: the trait bound `i8: AtomicImpl` is not satisfied
2026-01-05 16:25 [boqun:rust-sync.20260105a 18/22] error[E0277]: the trait bound `i8: AtomicImpl` is not satisfied kernel test robot
@ 2026-01-06 0:49 ` Boqun Feng
0 siblings, 0 replies; 2+ messages in thread
From: Boqun Feng @ 2026-01-06 0:49 UTC (permalink / raw)
To: kernel test robot
Cc: FUJITA Tomonori, llvm, oe-kbuild-all, Richard Weinberger,
Anton Ivanov, Johannes Berg, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, Dave Hansen, x86, H. Peter Anvin, linux-um,
linux-kernel
[Cc UML]
On Tue, Jan 06, 2026 at 12:25:24AM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/boqun/linux.git rust-sync.20260105a
> head: 243aa6a057d46d3a4de9297422e480d469eddaf7
> commit: 06ed7e7e7aa656f7054af7d3d3387a07244d85b1 [18/22] rust: sync: atomic: Add i8/i16 xchg and cmpxchg support
> config: um-randconfig-001-20260105 (https://download.01.org/0day-ci/archive/20260106/202601060041.k0JkAkUD-lkp@intel.com/config)
> compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
> rustc: rustc 1.88.0 (6b00bc388 2025-06-23)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260106/202601060041.k0JkAkUD-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/202601060041.k0JkAkUD-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
> In file included from kernel/sched/rq-offsets.c:5:
> In file included from kernel/sched/sched.h:28:
> In file included from include/linux/cgroup_api.h:1:
> In file included from include/linux/cgroup.h:27:
> In file included from include/linux/kernel_stat.h:8:
> In file included from include/linux/interrupt.h:11:
> In file included from include/linux/hardirq.h:11:
> In file included from arch/um/include/asm/hardirq.h:24:
> In file included from include/linux/irq.h:20:
> In file included from include/linux/io.h:12:
> In file included from arch/um/include/asm/io.h:24:
> include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> 1209 | return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
> | ~~~~~~~~~~ ^
> 1 warning generated.
> llvm-nm: error: rust/helpers/helpers.o: No such file or directory
> clang diag: include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> clang diag: include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> clang diag: include/asm-generic/io.h:1209:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
> >> error[E0277]: the trait bound `i8: AtomicImpl` is not satisfied
> --> rust/kernel/sync/atomic/internal.rs:265:7
> |
> 265 | [ i8 => atomic_i8, i16 => atomic_i16, i32 => atomic, i64 => atomic64 ]
> | ^^ the trait `AtomicImpl` is not implemented for `i8`
> |
> = help: the following other types implement trait `AtomicImpl`:
> i32
> i64
UML_X86 is using the atomics of x86 kernel (defined in
arch/x86/include/asm/atomic*), right? If so, I think we need this:
diff --git a/arch/x86/um/Kconfig b/arch/x86/um/Kconfig
index bdd7c8e39b01..44b12e45f9a0 100644
--- a/arch/x86/um/Kconfig
+++ b/arch/x86/um/Kconfig
@@ -9,6 +9,7 @@ endmenu
config UML_X86
def_bool y
select ARCH_USE_QUEUED_RWLOCKS
+ select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_USE_QUEUED_SPINLOCKS
select DCACHE_WORD_ACCESS
select HAVE_EFFICIENT_UNALIGNED_ACCESS
Regards,
Boqun
[...]
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2026-01-05 16:25 [boqun:rust-sync.20260105a 18/22] error[E0277]: the trait bound `i8: AtomicImpl` is not satisfied kernel test robot
2026-01-06 0:49 ` Boqun Feng
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