CVS commit: src/sys/arch/aarch64/aarch64

["Rin Okuyama" <rin%netbsd.org@localhost>]

Module Name:    src
Committed By:   rin
Date:           Thu Jul  2 12:59:31 UTC 2020

Modified Files:
        src/sys/arch/aarch64/aarch64: pmap.c

Log Message:
Set uvmexp.ncolors appropriately, which is required for some CPU
models with VIPT icache.

Otherwise, alias in virtual address results in inconsistent results,
at least for applications that rewrite text of other process, e.g.,
GDB for arm32.

Also, this hopefully fixes other unexpected failures due to alias.

Confirmed that there's no observable regression in performance;
difference in ``time make -j8'' for GENERIC64 kernel on BCM2837
with and without setting uvmexp.ncolors is within 0.1%.

Thanks to ryo@ for discussion.


To generate a diff of this commit:
cvs rdiff -u -r1.80 -r1.81 src/sys/arch/aarch64/aarch64/pmap.c

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