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runtime: remove extraneous stackPreempt setting

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The stackguard is set to stackPreempt earlier in reentersyscall, and
as it comes with throwsplit = true there's no way for the stackguard
to be set to anything else by the end of reentersyscall.

Change-Id: I4e942005b22ac784c52398c74093ac887fc8ec24
Reviewed-on: https://go-review.googlesource.com/65673
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
David Crawshaw 2017-09-24 10:48:18 -04:00 committed by Brad Fitzpatrick
parent ebb77aa867
commit b03f1d1a7e
1 changed files with 0 additions and 4 deletions
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4
src/runtime/proc.go
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@ -2824,10 +2824,6 @@ func reentersyscall(pc, sp uintptr) {
save(pc, sp)
}
// Goroutines must not split stacks in Gsyscall status (it would corrupt g->sched).
// We set _StackGuard to StackPreempt so that first split stack check calls morestack.
// Morestack detects this case and throws.
_g_.stackguard0 = stackPreempt
_g_.m.locks--
}