commit 8c92ba6c327ee5089dec1e92eaa82927bee63d6d
author Chris Metcalf <cmetcalf@tilera.com> Thu Mar 29 15:57:18 2012 -0400
committer Chris Metcalf <cmetcalf@tilera.com> Mon Apr 02 12:13:29 2012 -0400
tree 0604093dfc61953b629a0b0889b6549dc1797d6c
parent bfffe79bc29a9c4c817d5f51590961220e26db1a

arch/tile: add "nop" after "nap" to help GX idle power draw

This avoids the hardware istream prefetcher doing unnecessary work.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

arch/tile/kernel/smp.c

diff --git a/arch/tile/kernel/smp.c b/arch/tile/kernel/smp.c
index a44e103..7b6df8c 100644
--- a/arch/tile/kernel/smp.c
+++ b/arch/tile/kernel/smp.c
@@ -103,7 +103,7 @@
 	set_cpu_online(smp_processor_id(), 0);
 	arch_local_irq_disable_all();
 	for (;;)
-		asm("nap");
+		asm("nap; nop");
 }
 
 /* This function calls the 'stop' function on all other CPUs in the system. */