linux-kernel - [PATCH BUGFIX] frv: Define cpu_relax

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Date:	Mon, 18 Aug 2014 13:00:39 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	David Howells <dhowells@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	davidlohr@...com
Subject: [PATCH BUGFIX] frv: Define cpu_relax_lowlatency()

3a6bfbc9 (arch,locking: Ciao arch_mutex_cpu_relax()) broke building the frv
arch. Fixes errors such as:

kernel/locking/mcs_spinlock.h:87:2: error: implicit declaration of function 'cpu_relax_lowlatency'

Signed-off-by: Davidlohr Bueso <davidlohr@...com>
---
Linus, as discussed, here's the resend.
Original thread: https://lkml.org/lkml/2014/8/5/442

 arch/frv/include/asm/processor.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/frv/include/asm/processor.h b/arch/frv/include/asm/processor.h
index a34f309..6554e78 100644
--- a/arch/frv/include/asm/processor.h
+++ b/arch/frv/include/asm/processor.h
@@ -129,7 +129,8 @@ unsigned long get_wchan(struct task_struct *p);
 #define	KSTK_EIP(tsk)	((tsk)->thread.frame0->pc)
 #define	KSTK_ESP(tsk)	((tsk)->thread.frame0->sp)
 
-#define cpu_relax()    barrier()
+#define cpu_relax() barrier()
+#define cpu_relax_lowlatency() cpu_relax()
 
 /* data cache prefetch */
 #define ARCH_HAS_PREFETCH
-- 
1.8.1.4



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