CVS commit: src/sys/arch/powerpc/powerpc

["Chuck Silvers" <chs%netbsd.org@localhost>]

Module Name:    src
Committed By:   chs
Date:           Tue Feb 28 17:35:29 UTC 2017

Modified Files:
        src/sys/arch/powerpc/powerpc: locore_subr.S

Log Message:
in cpu_switchto() and the fast-softint context switch code,
put back the stwcx. instruction to clear the reservation.
we used to have this in the old cpu_switch() until it was
if-0'd in 2003 and removed completely in 2007.
this fixes hangs I've seen where a softint thread is
blocked waiting for a mutex that is not held.
this should also fix PR 44387.


To generate a diff of this commit:
cvs rdiff -u -r1.54 -r1.55 src/sys/arch/powerpc/powerpc/locore_subr.S

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