PR/44387 CVS commit: src/sys/arch/powerpc/powerpc

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

The following reply was made to PR port-powerpc/44387; it has been noted by GNATS.

From: "Chuck Silvers" <chs%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/44387 CVS commit: src/sys/arch/powerpc/powerpc
Date: Tue, 28 Feb 2017 17:35:29 +0000

 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.