[IA64-SGI] - New SN hardware support - cpu_relax

Add a few missing calls to "hint @pause".

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/ia64/sn/pci/pcibr/pcibr_dma.c b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
index 0f254255f6a1..34093476e965 100644
--- a/arch/ia64/sn/pci/pcibr/pcibr_dma.c
+++ b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
@@ -317,7 +317,8 @@ void sn_dma_flush(uint64_t addr)
                 *(volatile uint32_t *)(p->sfdl_force_int_addr) = 1;
 
                 /* wait for the interrupt to come back. */
-                while (*(p->sfdl_flush_addr) != 0x10f) ;
+                while (*(p->sfdl_flush_addr) != 0x10f)
+                        cpu_relax();
 
                 /* okay, everything is synched up. */
                 spin_unlock_irqrestore((spinlock_t *)&p->sfdl_flush_lock, flags);