Merge git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

* git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: (29 commits)
  [POWERPC] Fix rheap alignment problem
  [POWERPC] Use check_legacy_ioport() for ISAPnP
  [POWERPC] Avoid NULL pointer in gpio1_interrupt
  [POWERPC] Enable generic rtc hook for the MPC8349 mITX
  [POWERPC] Add powerpc get/set_rtc_time interface to new generic rtc class
  [POWERPC] Create a "wrapper" script and use it in arch/powerpc/boot
  [POWERPC] fix spin lock nesting in hvc_iseries
  [POWERPC] EEH failure to mark pci slot as frozen.
  [POWERPC] update powerpc defconfig files after libata kconfig breakage
  [POWERPC] enable sysrq in pmac32_defconfig
  [POWERPC] UPIO_TSI cleanup
  [POWERPC] rewrite mkprep and mkbugboot in sane C
  [POWERPC] maple/pci iomem annotations
  [POWERPC] powerpc oprofile __user annotations
  [POWERPC] cell spufs iomem annotations
  [POWERPC] NULL noise removal: spufs
  [POWERPC] ppc math-emu needs -fno-builtin-fabs for math.c and fabs.c
  [POWERPC] update mpc8349_itx_defconfig and remove some debug settings
  [POWERPC] Always call cede in pseries dedicated idle loop
  [POWERPC] Fix loop logic in irq_alloc_virt()
  ...

1 files changed, 3 insertions, 21 deletions

diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 4f0097f31bdb..43dbf737698c 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -477,7 +477,6 @@ static void pseries_dedicated_idle_sleep(void)
 { 
         unsigned int cpu = smp_processor_id();
         unsigned long start_snooze;
-        unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 
         /*
          * Indicate to the HV that we are idle. Now would be
@@ -490,9 +489,9 @@ static void pseries_dedicated_idle_sleep(void)
          * has been checked recently.  If we should poll for a little
          * while, do so.
          */
-        if (*smt_snooze_delay) {
+        if (__get_cpu_var(smt_snooze_delay)) {
                 start_snooze = get_tb() +
-                        *smt_snooze_delay * tb_ticks_per_usec;
+                        __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
                 local_irq_enable();
                 set_thread_flag(TIF_POLLING_NRFLAG);
 
@@ -512,24 +511,7 @@ static void pseries_dedicated_idle_sleep(void)
                         goto out;
         }
 
-        /*
-         * 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
-         * polling in order to reduce interrupt latency.
-         *
-         * Doing the cede when the other thread is active will
-         * result in this thread going dormant, meaning the other
-         * thread gets to run in single-threaded (ST) mode, which
-         * is slightly faster than SMT mode with this thread at
-         * very low priority.  The cede enables interrupts, which
-         * doesn't matter here.
-         */
-        if (!cpu_has_feature(CPU_FTR_SMT) || !lppaca[cpu ^ 1].idle
-            || poll_pending() == H_PENDING)
-                cede_processor();
+        cede_processor();
 
 out:
         HMT_medium();