tree 904764e1cb4fcf37f7bd4022c43eae35d45b6bfb
parent 8566979972d51236c37b2823d2c0d52c6efe5406
author Srdjan Petrovic <spetrovic@google.com> 1429219938 -0700
committer David Crawshaw <crawshaw@golang.org> 1429894406 +0000

runtime: implement xadduintptr and update system mstats using it

The motivation is that sysAlloc/Free() currently aren't safe to be
called without a valid G, because arm's xadd64() uses locks that require
a valid G.

The solution here was proposed by Dmitry Vyukov: use xadduintptr()
instead of xadd64(), until arm can support xadd64 on all of its
architectures (not a trivial task for arm).

Change-Id: I250252079357ea2e4360e1235958b1c22051498f
Reviewed-on: https://go-review.googlesource.com/9002
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>