CVS commit: src/sys

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

Module Name:    src
Committed By:   riastradh
Date:           Sat Apr  9 23:38:33 UTC 2022

Modified Files:
        src/sys/arch/aarch64/aarch64: pmap.c
        src/sys/arch/alpha/alpha: pmap.c
        src/sys/arch/arm/arm32: pmap.c
        src/sys/arch/hppa/hppa: pmap.c
        src/sys/arch/ia64/ia64: pmap.c
        src/sys/arch/powerpc/oea: pmap.c
        src/sys/arch/sparc/sparc: pmap.c
        src/sys/arch/sparc64/sparc64: pmap.c
        src/sys/dev/hyperv: vmbus.c
        src/sys/dev/marvell: mvxpsec.c
        src/sys/dev/scsipi: atapiconf.c scsiconf.c scsipi_base.c
        src/sys/external/bsd/drm2/linux: linux_stop_machine.c
        src/sys/kern: kern_auth.c kern_exec.c kern_mutex_obj.c kern_resource.c
            kern_rwlock_obj.c kern_sig.c subr_kcpuset.c sys_futex.c uipc_mbuf.c
            vfs_cwd.c vfs_mount.c vfs_vnode.c vfs_wapbl.c
        src/sys/net: if.c
        src/sys/net/npf: npf_nat.c npf_rproc.c npf_tableset.c
        src/sys/uvm: uvm_aobj.c uvm_map.c
        src/sys/uvm/pmap: pmap.c

Log Message:
sys: Use membar_release/acquire around reference drop.

This just goes through my recent reference count membar audit and
changes membar_exit to membar_release and membar_enter to
membar_acquire -- this should make everything cheaper on most CPUs
without hurting correctness, because membar_acquire is generally
cheaper than membar_enter.


To generate a diff of this commit:
cvs rdiff -u -r1.132 -r1.133 src/sys/arch/aarch64/aarch64/pmap.c
cvs rdiff -u -r1.306 -r1.307 src/sys/arch/alpha/alpha/pmap.c
cvs rdiff -u -r1.435 -r1.436 src/sys/arch/arm/arm32/pmap.c
cvs rdiff -u -r1.115 -r1.116 src/sys/arch/hppa/hppa/pmap.c
cvs rdiff -u -r1.41 -r1.42 src/sys/arch/ia64/ia64/pmap.c
cvs rdiff -u -r1.112 -r1.113 src/sys/arch/powerpc/oea/pmap.c
cvs rdiff -u -r1.376 -r1.377 src/sys/arch/sparc/sparc/pmap.c
cvs rdiff -u -r1.315 -r1.316 src/sys/arch/sparc64/sparc64/pmap.c
cvs rdiff -u -r1.16 -r1.17 src/sys/dev/hyperv/vmbus.c
cvs rdiff -u -r1.12 -r1.13 src/sys/dev/marvell/mvxpsec.c
cvs rdiff -u -r1.94 -r1.95 src/sys/dev/scsipi/atapiconf.c
cvs rdiff -u -r1.300 -r1.301 src/sys/dev/scsipi/scsiconf.c
cvs rdiff -u -r1.188 -r1.189 src/sys/dev/scsipi/scsipi_base.c
cvs rdiff -u -r1.3 -r1.4 src/sys/external/bsd/drm2/linux/linux_stop_machine.c
cvs rdiff -u -r1.80 -r1.81 src/sys/kern/kern_auth.c
cvs rdiff -u -r1.516 -r1.517 src/sys/kern/kern_exec.c
cvs rdiff -u -r1.8 -r1.9 src/sys/kern/kern_mutex_obj.c
cvs rdiff -u -r1.188 -r1.189 src/sys/kern/kern_resource.c
cvs rdiff -u -r1.6 -r1.7 src/sys/kern/kern_rwlock_obj.c
cvs rdiff -u -r1.403 -r1.404 src/sys/kern/kern_sig.c
cvs rdiff -u -r1.13 -r1.14 src/sys/kern/subr_kcpuset.c
cvs rdiff -u -r1.16 -r1.17 src/sys/kern/sys_futex.c
cvs rdiff -u -r1.245 -r1.246 src/sys/kern/uipc_mbuf.c
cvs rdiff -u -r1.7 -r1.8 src/sys/kern/vfs_cwd.c
cvs rdiff -u -r1.92 -r1.93 src/sys/kern/vfs_mount.c
cvs rdiff -u -r1.141 -r1.142 src/sys/kern/vfs_vnode.c
cvs rdiff -u -r1.111 -r1.112 src/sys/kern/vfs_wapbl.c
cvs rdiff -u -r1.502 -r1.503 src/sys/net/if.c
cvs rdiff -u -r1.51 -r1.52 src/sys/net/npf/npf_nat.c
cvs rdiff -u -r1.21 -r1.22 src/sys/net/npf/npf_rproc.c
cvs rdiff -u -r1.37 -r1.38 src/sys/net/npf/npf_tableset.c
cvs rdiff -u -r1.154 -r1.155 src/sys/uvm/uvm_aobj.c
cvs rdiff -u -r1.392 -r1.393 src/sys/uvm/uvm_map.c
cvs rdiff -u -r1.63 -r1.64 src/sys/uvm/pmap/pmap.c

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