tree 718a7140c6704e640220e94192153aea8f33691f
parent 8eb846fd37eb7bded8a1cf6932be2c59069863e5
author Joel Sing <joel@sing.id.au> 1604249888 +1100
committer Joel Sing <joel@sing.id.au> 1604470442 +0000

runtime: allow physical page aligned stacks to be allocated

Add a physPageAlignedStack boolean which if set, results in over allocation
by a physical page, the allocation being rounded to physical page alignment
and the unused memory surrounding the allocation being freed again.

OpenBSD/octeon has 16KB physical pages and requires stacks to be physical page
aligned in order for them to be remapped as MAP_STACK. This change allows Go
to work on this platform.

Based on a suggestion from mknyszek in issue #41008.

Updates #40995
Fixes #41008

Change-Id: Ia5d652292b515916db473043b41f6030094461d8
Reviewed-on: https://go-review.googlesource.com/c/go/+/266919
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>