From: Jens Axboe <jens.axboe@oracle.com>
Date: Mon, 2 Jun 2008 07:41:51 +0000 (+0200)
Subject: x86-64: ffz need only search the first 32-bits
X-Git-Tag: fio-1.21-rc4~7
X-Git-Url: https://git.kernel.dk/?p=fio.git;a=commitdiff_plain;h=6164890e4db96c073274990edca12706e9c41659;ds=sidebyside

x86-64: ffz need only search the first 32-bits

So use bsfl, not bsfq.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

diff --git a/arch/arch-x86_64.h b/arch/arch-x86_64.h
index 972c623a..a8f075a0 100644
--- a/arch/arch-x86_64.h
+++ b/arch/arch-x86_64.h
@@ -32,11 +32,11 @@
 #define nop		__asm__ __volatile__("rep;nop": : :"memory")
 #define read_barrier()	asm volatile("lfence":::"memory")
 
-static inline unsigned long arch_ffz(unsigned long bitmask)
+static inline unsigned int arch_ffz(unsigned int bitmask)
 {
-	__asm__("bsfq %1,%0" :"=r" (bitmask) :"r" (~bitmask));
+	__asm__("bsfl %1,%0" :"=r" (bitmask) :"r" (~bitmask));
 	return bitmask;
 }
-#define ARCH_HAVE_FFZ
+//#define ARCH_HAVE_FFZ
 
 #endif