Module Name: src
Committed By: riastradh
Date: Wed Mar 1 08:17:24 UTC 2023
Modified Files:
src/sys/arch/aarch64/aarch64: cpuswitch.S
Log Message:
aarch64: Optimization: Omit needless membar when triggering softint.
When we are triggering a softint, it can't already hold any mutexes.
So any path to mutex_exit(mtx) must go via mutex_enter(mtx), which is
always done with atomic r/m/w, and we need not issue any explicit
barrier between ci->ci_curlwp = softlwp and a potential load of
mtx->mtx_owner in mutex_exit.
PR kern/57240
XXX pullup-9
XXX pullup-10
To generate a diff of this commit:
cvs rdiff -u -r1.40 -r1.41 src/sys/arch/aarch64/aarch64/cpuswitch.S
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
