[PATCH] ppc64: cleanup iseries runlight support
The iseries has a bar graph on the front panel that shows how busy it is.
The operating system sets and clears a bit in the CTRL register to control
it.
Instead of going to the complexity of using a thread info bit, just set and
clear it in the idle loop.
Also create two helper functions, ppc64_runlatch_on and ppc64_runlatch_off.
Finally don't use the short form of the SPR defines.
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/ppc64/kernel/sysfs.c b/arch/ppc64/kernel/sysfs.c
index 0925694..c8fa656 100644
--- a/arch/ppc64/kernel/sysfs.c
+++ b/arch/ppc64/kernel/sysfs.c
@@ -113,7 +113,6 @@
#ifdef CONFIG_PPC_PSERIES
unsigned long set, reset;
int ret;
- unsigned int ctrl;
#endif /* CONFIG_PPC_PSERIES */
/* Only need to enable them once */
@@ -167,11 +166,8 @@
* On SMT machines we have to set the run latch in the ctrl register
* in order to make PMC6 spin.
*/
- if (cpu_has_feature(CPU_FTR_SMT)) {
- ctrl = mfspr(CTRLF);
- ctrl |= RUNLATCH;
- mtspr(CTRLT, ctrl);
- }
+ if (cpu_has_feature(CPU_FTR_SMT))
+ ppc64_runlatch_on();
#endif /* CONFIG_PPC_PSERIES */
}