Merge branch 'iommu-fixes-2.6.28' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into x86/urgent

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 3e2c05cb6a87..04f8c67a6101 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -136,9 +136,12 @@ static void default_idle(void)
                 return;
         }
         trace_hardirqs_on();
+        /* Don't trace preempt off for idle. */
+        stop_critical_timings();
         /* Wait for external, I/O or machine check interrupt. */
         __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT |
                         PSW_MASK_IO | PSW_MASK_EXT);
+        start_critical_timings();
 }
 
 void cpu_idle(void)