kernel/linux.git/rust/helpers/atomic_ext.c, branch v7.0-rc7Linux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=v7.0-rc72026-01-09T11:01:41+00:00rust: helpers: Add i8/i16 atomic try_cmpxchg_relaxed helpers2026-01-09T11:01:41+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-27T11:59:51+00:00urn:sha1:8de731a6c75547602601a5d219b5cf259ce2b38b
Add i8/i16 atomic try_cmpxchg_relaxed helpers that call
try_cmpxchg_relaxed() macro implementing atomic try_cmpxchg_relaxed
using architecture-specific instructions.
[boqun: Use try_cmpxchg_relaxed() instead of raw_try_cmpxchg_relaxed()]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251227115951.1424458-5-fujita.tomonori@gmail.com
rust: helpers: Add i8/i16 atomic try_cmpxchg_release helpers2026-01-09T11:01:41+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-27T11:59:50+00:00urn:sha1:b5992f07a9736ab6279181c848f42227af9945bf
Add i8/i16 atomic try_cmpxchg_release helpers that call
try_cmpxchg_release() macro implementing atomic try_cmpxchg_release
using architecture-specific instructions.
[boqun: Use try_cmpxchg_release() instead of raw_try_cmpxchg_release()]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251227115951.1424458-4-fujita.tomonori@gmail.com
rust: helpers: Add i8/i16 atomic try_cmpxchg_acquire helpers2026-01-09T11:01:41+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-27T11:59:49+00:00urn:sha1:fed6aaa392c301721144303d64b7c68575d9d5ef
Add i8/i16 atomic try_cmpxchg_acquire helpers that call
try_cmpxchg_acquire() macro implementing atomic try_cmpxchg_acquire
using architecture-specific instructions.
[boqun: Use try_cmpxchg_acquire() instead of raw_try_cmpxchg_acquire()]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251227115951.1424458-3-fujita.tomonori@gmail.com
rust: helpers: Add i8/i16 atomic try_cmpxchg helpers2026-01-09T11:01:41+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-27T11:59:48+00:00urn:sha1:164e4b5600b32b4ddeac58bb5b37bc1490a1dce4
Add i8/i16 atomic try_cmpxchg helpers that call try_cmpxchg() macro
implementing atomic try_cmpxchg using architecture-specific
instructions.
[boqun: Add comments explaining CONFIG_ARCH_SUPPORTS_ATOMIC_RMW and use
try_cmpxchg() instead of raw_try_cmpxchg()]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251227115951.1424458-2-fujita.tomonori@gmail.com
rust: helpers: Add i8/i16 atomic xchg_relaxed helpers2026-01-09T11:01:41+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-23T06:21:40+00:00urn:sha1:910cbddc416cc30d83966baf378f44e59f3dc5d7
Add i8/i16 atomic xchg_relaxed helpers that call xchg_relaxed() macro
implementing atomic xchg_relaxed using architecture-specific
instructions.
[boqun: Use xchg_relaxed() instead of raw_xchg_relaxed()]
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251223062140.938325-5-fujita.tomonori@gmail.com
rust: helpers: Add i8/i16 atomic xchg_release helpers2026-01-09T11:01:40+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-23T06:21:39+00:00urn:sha1:1bfca1e7e845a55fa82046727666f713d24ebdad
Add i8/i16 atomic xchg_release helpers that call xchg_release() macro
implementing atomic xchg_release using architecture-specific
instructions.
[boqun: Use xchg_release() instead of raw_xchg_release()]
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251223062140.938325-4-fujita.tomonori@gmail.com
rust: helpers: Add i8/i16 atomic xchg_acquire helpers2026-01-09T11:01:40+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-23T06:21:38+00:00urn:sha1:ab717dd98bee964add2161d94193d756fdef614c
Add i8/i16 atomic xchg_acquire helpers that call xchg_acquire() macro
implementing atomic xchg_acquire using architecture-specific
instructions.
[boqun: Use xchg_acquire() instead of raw_xchg_acquire()]
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251223062140.938325-3-fujita.tomonori@gmail.com
rust: helpers: Add i8/i16 atomic xchg helpers2026-01-09T11:01:40+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-23T06:21:37+00:00urn:sha1:5dbc0a692459bc49cdb7add281086291da547750
Add i8/i16 atomic xchg helpers that call xchg() macro implementing
atomic xchg using architecture-specific instructions.
[boqun: Use xchg() instead of raw_xchg()]
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251223062140.938325-2-fujita.tomonori@gmail.com
rust: helpers: Add i8/i16 relaxed atomic helpers2026-01-09T11:01:40+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-11T11:38:24+00:00urn:sha1:300e53b3d3b59e72a972a12ee5c6438aab4860a4
Add READ_ONCE/WRITE_ONCE based helpers for i8 and i16 types to support
relaxed atomic operations in Rust.
While relaxed operations could be implemented purely in Rust using
read_volatile() and write_volatile(), using C's READ_ONCE() and
WRITE_ONCE() macros ensures complete consistency with the kernel
memory model.
These helpers expose different symbol names than their C counterparts
so they are split into atomic_ext.c instead of atomic.c. The symbol
names; the names make the interface Rust/C clear, consistent with
i32/i64.
[boqun: Rename the functions from {load,store} to {read,set} to avoid
future adjustment]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251211113826.1299077-3-fujita.tomonori@gmail.com
rust: helpers: Add i8/i16 atomic_read_acquire/atomic_set_release helpers2026-01-09T11:01:40+00:00FUJITA Tomonorifujita.tomonori@gmail.com2025-12-11T11:38:23+00:00urn:sha1:2cc3d5d6adbee058858f2e66de701a203b032746
Add helper functions to expose smp_load_acquire() and
smp_store_release() for i8 and i16 types.
The smp_load_acquire() and smp_store_release() macros require type
information (sizeof) to generate appropriate architecture-specific
memory ordering instructions. Therefore, separate helper functions are
needed for each type size.
These helpers expose different symbol names than their C counterparts
so they are split into atomic_ext.c instead of atomic.c. The symbol
names; atomic_[i8|i16]_read_acquire and atomic_[i8|i16]_set_release
makes the interface Rust/C clear, consistent with i32/i64.
These helpers will be used by the upcoming Atomic<i8> and Atomic<i16>
implementation to provide proper Acquire/Release semantics across all
architectures.
[boqun: Rename the functions from {load,store} to {read,set} to avoid
future adjustment]
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://patch.msgid.link/20251211113826.1299077-2-fujita.tomonori@gmail.com