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Fix wrong cache line size of riscv64 #145078

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Fix wrong cache line size of riscv64 #145078

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8 changes: 3 additions & 5 deletions library/std/src/sync/mpmc/utils.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -23,22 +23,20 @@ use crate::ops::{Deref, DerefMut};
any(target_arch = "x86_64", target_arch = "aarch64", target_arch = "powerpc64",),
repr(align(128))
)]
// arm, mips, mips64, and riscv64 have 32-byte cache line size.
// arm, mips and mips64 have 32-byte cache line size.
//
// Sources:
// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_arm.go#L7
// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips.go#L7
// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mipsle.go#L7
// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_mips64x.go#L9
// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_riscv64.go#L7
#[cfg_attr(
any(
target_arch = "arm",
target_arch = "mips",
target_arch = "mips32r6",
target_arch = "mips64",
target_arch = "mips64r6",
target_arch = "riscv64",
),
repr(align(32))
)]
Expand All @@ -47,11 +45,12 @@ use crate::ops::{Deref, DerefMut};
// Sources:
// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_s390x.go#L7
#[cfg_attr(target_arch = "s390x", repr(align(256)))]
// x86 and wasm have 64-byte cache line size.
// x86, wasm and riscv have 64-byte cache line size.
//
// Sources:
// - https://github.com/golang/go/blob/dda2991c2ea0c5914714469c4defc2562a907230/src/internal/cpu/cpu_x86.go#L9
// - https://github.com/golang/go/blob/3dd58676054223962cd915bb0934d1f9f489d4d2/src/internal/cpu/cpu_wasm.go#L7
// - https://github.com/golang/go/blob/5e31f78c8a4ed1b872ddc194f0cd1ae931b37d7e/src/internal/cpu/cpu_riscv64.go#L7
//
// All others are assumed to have 64-byte cache line size.
#[cfg_attr(
Expand All @@ -64,7 +63,6 @@ use crate::ops::{Deref, DerefMut};
target_arch = "mips32r6",
target_arch = "mips64",
target_arch = "mips64r6",
target_arch = "riscv64",
target_arch = "s390x",
)),
repr(align(64))
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