arch/tile: fix bug in delay_backoff()

We were carefully computing a value to use for the number of loops
to spin for, and then ignoring it.

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

diff --git a/arch/tile/lib/spinlock_common.h b/arch/tile/lib/spinlock_common.h
index c101098..6ac3750 100644 (file)
--- a/arch/tile/lib/spinlock_common.h
+++ b/arch/tile/lib/spinlock_common.h
@@ -60,5 +60,5 @@ static void delay_backoff(int iterations)
        loops += __insn_crc32_32(stack_pointer, get_cycles_low()) &
                (loops - 1);
 
-       relax(1 << exponent);
+       relax(loops);
 }