linux-kernel - [PATCH/RFC 1/3] processor: remove spin_cpu

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Date:   Sat,  8 Jun 2019 13:08:51 +0200
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH/RFC 1/3] processor: remove spin_cpu_yield

spin_cpu_yield is unused, therefore remove it.

Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>
---
 arch/powerpc/include/asm/processor.h | 2 --
 include/linux/processor.h            | 9 ---------
 2 files changed, 11 deletions(-)

diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index ef573fe9873e..a9993e7a443b 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -346,8 +346,6 @@ static inline unsigned long __pack_fe01(unsigned int fpmode)
 
 #define spin_cpu_relax()	barrier()
 
-#define spin_cpu_yield()	spin_cpu_relax()
-
 #define spin_end()	HMT_medium()
 
 #define spin_until_cond(cond)					\
diff --git a/include/linux/processor.h b/include/linux/processor.h
index dbc952eec869..dc78bdc7079a 100644
--- a/include/linux/processor.h
+++ b/include/linux/processor.h
@@ -32,15 +32,6 @@
 #define spin_cpu_relax() cpu_relax()
 #endif
 
-/*
- * spin_cpu_yield may be called to yield (undirected) to the hypervisor if
- * necessary. This should be used if the wait is expected to take longer
- * than context switch overhead, but we can't sleep or do a directed yield.
- */
-#ifndef spin_cpu_yield
-#define spin_cpu_yield() cpu_relax_yield()
-#endif
-
 #ifndef spin_end
 #define spin_end()
 #endif
-- 
2.17.1