runtime: remove unused armArch

runtime.armArch is unused on linux/arm since CL 93637. The new code in
runtime/internal/atomic (added by CL 111315) only checks runtime.goarm.

Change-Id: Ic097ee6750e39abb20f45770a1c7c2d925f02408
Reviewed-on: https://go-review.googlesource.com/c/140077
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/runtime/os_linux_arm.go b/src/runtime/os_linux_arm.go
index 8f082ba6a0ac4b93cb02aacd8ab7d7c501c081b7..207b0e4d4d125084e5b405629439170dbcade1d1 100644 (file)
--- a/src/runtime/os_linux_arm.go
+++ b/src/runtime/os_linux_arm.go
@@ -4,20 +4,14 @@
 
 package runtime
 
-import (
-       "internal/cpu"
-       "unsafe"
-)
+import "internal/cpu"
 
 const (
-       _AT_PLATFORM = 15 //  introduced in at least 2.6.11
-
        _HWCAP_VFP   = 1 << 6  // introduced in at least 2.6.11
        _HWCAP_VFPv3 = 1 << 13 // introduced in 2.6.30
 )
 
 var randomNumber uint32
-var armArch uint8 = 6 // we default to ARMv6
 
 func checkgoarm() {
        // On Android, /proc/self/auxv might be unreadable and hwcap won't
@@ -47,12 +41,6 @@ func archauxv(tag, val uintptr) {
                randomNumber = uint32(startupRandomData[4]) | uint32(startupRandomData[5])<<8 |
                        uint32(startupRandomData[6])<<16 | uint32(startupRandomData[7])<<24
 
-       case _AT_PLATFORM: // v5l, v6l, v7l
-               t := *(*uint8)(unsafe.Pointer(val + 1))
-               if '5' <= t && t <= '7' {
-                       armArch = t - '0'
-               }
-
        case _AT_HWCAP:
                cpu.HWCap = uint(val)
        case _AT_HWCAP2: