cpu: don't panic on error reading /proc/self/auxv

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On Android /proc/self/auxv is not readable, leading to a panic in init.
Instead of panic'ing in this case, introduce the Initialized global bool
to report whether the CPU features were initialized i.e. /proc/self/auxv
was successfullly read.

Fixes golang/go#30413

Change-Id: Ib520f202990614a76bceb0bf9d19a88eadd13e10
Reviewed-on: https://go-review.googlesource.com/c/164057
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

This commit is contained in:

Tobias Klauser

2019-02-28 07:16:10 +00:00

committed by

Tobias Klauser

parent 775f8194d0

commit 92a0ff1e1e

4 changed files with 17 additions and 1 deletions

									
										cpu/cpu_x86.go
									
		+2
		
												View File
												
				@@ -9,6 +9,8 @@ package cpu

				const cacheLineSize = 64

				func init() {

					Initialized = true

					maxID, _, _, _ := cpuid(0, 0)

					if maxID < 1 {