[POWERPC] spusched: Catch nosched contexts in spu_deactivate
spu_deactivate should never be called for nosched contets. Put in a check so we can print a stacktrace and exit early in case it happes erroneously. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NArnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: NJeremy Kerr <jk@ozlabs.org> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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