[PATCH] ppc64: disable HMT for RS64 cpus

Hardware multithreading for RS64 cpus is currently broken.  Anton sent me a
patch a few weeks ago, but it did not work.  So just hide the config option
for the time being.
Signed-off-by: Olaf Hering <olh@suse.de>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ppc64/Kconfig

@@ -194,7 +194,10 @@ config NR_CPUS
 
 config HMT
 	bool "Hardware multithreading"
-	depends on SMP && PPC_PSERIES
+	depends on SMP && PPC_PSERIES && BROKEN
+	help
+	  This option enables hardware multithreading on RS64 cpus.
+	  pSeries systems p620 and p660 have such a cpu type.
 
 config DISCONTIGMEM
 	bool "Discontiguous Memory Support"