From: Chris Metcalf <cmetcalf@tilera.com>
Date: Thu, 29 Mar 2012 19:43:20 +0000 (-0400)
Subject: arch/tile: fix bug in delay_backoff()
X-Git-Tag: v3.4-rc2~7^2~19
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=444eef1ba40546690a77b2af4cba7d4561e7bba5;p=pandora-kernel.git

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 c10109809132..6ac37509faca 100644
--- 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);
 }