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Date: Tue, 11 Feb 2020 03:14:49 +0000
From: "Taylor R Campbell" <riastradh@netbsd.org>
Subject: CVS commit: src/sys/kern
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Module Name:	src
Committed By:	riastradh
Date:		Tue Feb 11 03:14:49 UTC 2020

Modified Files:
	src/sys/kern: kern_lwp.c

Log Message:
Preserve pcu(9) state in fork.

There should perhaps be a pcu_fork operation to keep this factored
neatly but this will be simpler to pull up.

In practical terms, this may not affect most architecture that use
pcu(9) -- alpha, arm32, mips, powerpc, riscv -- but it does affect
aarch64, in which v8-v15 are callee-saves, and GCC actually takes
advantage of them, and for more than just floating-point data too.

XXX pullup


To generate a diff of this commit:
cvs rdiff -u -r1.223 -r1.224 src/sys/kern/kern_lwp.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.