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| author | Russ Cox <rsc@golang.org> | 2024-05-22 15:03:13 -0400 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2024-05-23 01:16:53 +0000 |
| commit | 05cbbf985fed823a174bf95cc78a7d44f948fdab (patch) | |
| tree | ffdb52c7ce57360323e22a68e20f45d10771a004 /src/internal/cpu | |
| parent | 1d3d6ae725697c5b224b26cb3aa1325ac37f72d7 (diff) | |
| download | go-05cbbf985fed823a174bf95cc78a7d44f948fdab.tar.xz | |
all: document legacy //go:linkname for modules with ≥500 dependents
For #67401.
Change-Id: I7dd28c3b01a1a647f84929d15412aa43ab0089ee
Reviewed-on: https://go-review.googlesource.com/c/go/+/587575
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Russ Cox <rsc@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Diffstat (limited to 'src/internal/cpu')
| -rw-r--r-- | src/internal/cpu/cpu_arm64_darwin.go | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/internal/cpu/cpu_arm64_darwin.go b/src/internal/cpu/cpu_arm64_darwin.go index 60beadddbb..fad66c6c90 100644 --- a/src/internal/cpu/cpu_arm64_darwin.go +++ b/src/internal/cpu/cpu_arm64_darwin.go @@ -6,6 +6,8 @@ package cpu +import _ "unsafe" // for linkname + func osInit() { ARM64.HasATOMICS = sysctlEnabled([]byte("hw.optional.armv8_1_atomics\x00")) ARM64.HasCRC32 = sysctlEnabled([]byte("hw.optional.armv8_crc32\x00")) @@ -24,6 +26,15 @@ func osInit() { //go:noescape func getsysctlbyname(name []byte) (int32, int32) +// sysctlEnabled should be an internal detail, +// but widely used packages access it using linkname. +// Notable members of the hall of shame include: +// - github.com/bytedance/gopkg +// +// Do not remove or change the type signature. +// See go.dev/issue/67401. +// +//go:linkname sysctlEnabled func sysctlEnabled(name []byte) bool { ret, value := getsysctlbyname(name) if ret < 0 { |