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2cc3d5d6ad
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
24 lines
472 B
C
24 lines
472 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <asm/barrier.h>
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__rust_helper s8 rust_helper_atomic_i8_read_acquire(s8 *ptr)
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{
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return smp_load_acquire(ptr);
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}
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__rust_helper s16 rust_helper_atomic_i16_read_acquire(s16 *ptr)
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{
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return smp_load_acquire(ptr);
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}
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__rust_helper void rust_helper_atomic_i8_set_release(s8 *ptr, s8 val)
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{
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smp_store_release(ptr, val);
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}
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__rust_helper void rust_helper_atomic_i16_set_release(s16 *ptr, s16 val)
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{
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smp_store_release(ptr, val);
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}
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