CVS commit: [netbsd-9] src/sys/kern

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Wed Feb 12 19:35:31 UTC 2020

Modified Files:
        src/sys/kern [netbsd-9]: kern_lwp.c

Log Message:
Pull up following revision(s) (requested by maya in ticket #697):

        sys/kern/kern_lwp.c: revision 1.224
        sys/kern/kern_lwp.c: revision 1.225

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

fix compilation failure for arches without l_pcu_valid
ok riastradh


To generate a diff of this commit:
cvs rdiff -u -r1.202.2.2 -r1.202.2.3 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.