CVS commit: [netbsd-9] src

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

Module Name:    src
Committed By:   martin
Date:           Fri Apr 30 13:54:00 UTC 2021

Modified Files:
        src/common/lib/libc/arch/arm/atomic [netbsd-9]: atomic_swap.S
            atomic_swap_16.S atomic_swap_64.S membar_ops.S
        src/sys/arch/arm/include [netbsd-9]: lock.h

Log Message:
Pull up following revision(s) (requested by skrll in ticket #1261):

        sys/arch/arm/include/lock.h: revision 1.38
        common/lib/libc/arch/arm/atomic/membar_ops.S: revision 1.7
        common/lib/libc/arch/arm/atomic/atomic_swap_16.S: revision 1.5
        common/lib/libc/arch/arm/atomic/atomic_swap_64.S: revision 1.12
        common/lib/libc/arch/arm/atomic/atomic_swap.S: revision 1.17

Add the appropriate memory barrier before the lock is cleared in
__sync_lock_release_{1,2,4,8}.  That is, all reads and write for the
inner shareability domain before the lock clear store.

Improve the membar_ops barriers - no need to use dsb and wait for
completion.  Also, we only to act on the inner shareability domain.

Fix the barrier confusion.  From Riastradh - thanks!.


To generate a diff of this commit:
cvs rdiff -u -r1.14.18.1 -r1.14.18.2 \
    src/common/lib/libc/arch/arm/atomic/atomic_swap.S
cvs rdiff -u -r1.4 -r1.4.18.1 \
    src/common/lib/libc/arch/arm/atomic/atomic_swap_16.S
cvs rdiff -u -r1.10.18.1 -r1.10.18.2 \
    src/common/lib/libc/arch/arm/atomic/atomic_swap_64.S
cvs rdiff -u -r1.6 -r1.6.28.1 \
    src/common/lib/libc/arch/arm/atomic/membar_ops.S
cvs rdiff -u -r1.33.8.1 -r1.33.8.2 src/sys/arch/arm/include/lock.h

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