Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc:
  [POWERPC] Minor comment fix for misc_64.S
  [POWERPC] Use H_CEDE on non-SMT
  [POWERPC] force 64bit mode in fwnmi handlers to workaround firmware bugs
  [POWERPC] PMAC_APM_EMU should depend on ADB_PMU
  [POWERPC] Fix new interrupt code (MPIC detection)
  [POWERPC] Fix new interrupt code (MPIC endianness)
  [POWERPC] Add cpufreq support for Xserve G5
  [POWERPC] Xserve G5 thermal control fixes
  [POWERPC] Fix mem= handling when the memory limit is > RMO size
  [POWERPC] More offb/bootx fixes
  [POWERPC] Fix legacy_serial.c error handling on 32 bits
  [POWERPC] Fix default clock for udbg_16550
  [POWERPC] Fix non-MPIC CHRPs with CONFIG_SMP set
  [POWERPC] Fix 32 bits warning in prom_init.c
  [POWERPC] Workaround Pegasos incorrect ISA "ranges"
  [POWERPC] fix up front-LED Kconfig

1 files changed, 4 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 54a52437265c..71c634e0b87c 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -501,7 +501,8 @@ static void pseries_dedicated_idle_sleep(void)
         }
 
         /*
-         * Cede if the other thread is not idle, so that it can
+         * If not SMT, cede processor.  If CPU is running SMT
+         * cede if the other thread is not idle, so that it can
          * go single-threaded.  If the other thread is idle,
          * we ask the hypervisor if it has pending work it
          * wants to do and cede if it does.  Otherwise we keep
@@ -514,7 +515,8 @@ static void pseries_dedicated_idle_sleep(void)
          * very low priority.  The cede enables interrupts, which
          * doesn't matter here.
          */
-        if (!lppaca[cpu ^ 1].idle || poll_pending() == H_PENDING)
+        if (!cpu_has_feature(CPU_FTR_SMT) || !lppaca[cpu ^ 1].idle
+            || poll_pending() == H_PENDING)
                 cede_processor();
 
 out: