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From: Michael Ellerman <mpe@ellerman.id.au>
To: linuxppc-dev@ozlabs.org
Cc: npiggin@gmail.com
Subject: [PATCH 1/2] powerpc/64: implement spin loop primitives
Date: Wed, 28 Jun 2017 22:13:41 +1000	[thread overview]
Message-ID: <1498652022-10417-1-git-send-email-mpe@ellerman.id.au> (raw)

From: Nicholas Piggin <npiggin@gmail.com>

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/include/asm/processor.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index c49165a7439c..832775771bd3 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -428,6 +428,26 @@ static inline unsigned long __pack_fe01(unsigned int fpmode)
 
 #ifdef CONFIG_PPC64
 #define cpu_relax()	do { HMT_low(); HMT_medium(); barrier(); } while (0)
+
+#define spin_begin()	HMT_low()
+
+#define spin_cpu_relax()	barrier()
+
+#define spin_cpu_yield()	spin_cpu_relax()
+
+#define spin_end()	HMT_medium()
+
+#define spin_until_cond(cond)					\
+do {								\
+	if (unlikely(!(cond))) {				\
+		spin_begin();					\
+		do {						\
+			spin_cpu_relax();			\
+		} while (!(cond));				\
+		spin_end();					\
+	}							\
+} while (0)
+
 #else
 #define cpu_relax()	barrier()
 #endif
-- 
2.7.4

             reply	other threads:[~2017-06-28 12:13 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-28 12:13 Michael Ellerman [this message]
2017-06-28 12:13 ` [PATCH 2/2] powerpc: use spin loop primitives in some functions Michael Ellerman
2017-07-02  9:30   ` kbuild test robot
2017-07-02 15:42     ` issue with kernel 4.12.rc6 addnote -kernel dont build luigi burdo
2017-07-10 11:01       ` Michael Ellerman
2017-07-13 10:09         ` luigi burdo
2017-07-02 11:01 ` [1/2] powerpc/64: implement spin loop primitives Michael Ellerman

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