CVS commit: src/sys/kern

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

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.