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78 lines
2.6 KiB
78 lines
2.6 KiB
# --- SDE-COPYRIGHT-NOTE-BEGIN ---
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# This copyright note is auto-generated by ./scripts/Create-CopyPatch.
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#
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# Filename: package/.../musl/0009-fix-regression-disabling-use-of-pause-instruction-fo.patch
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# Copyright (C) 2016 The OpenSDE Project
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#
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# More information can be found in the files COPYING and README.
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#
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# This patch file is dual-licensed. It is available under the license the
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# patched project is licensed under, as long as it is an OpenSource license
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# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
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# of the GNU General Public License as published by the Free Software
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# Foundation; either version 2 of the License, or (at your option) any later
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# version.
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# --- SDE-COPYRIGHT-NOTE-END ---
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From 5c3412d22555d03a1c00578ba8faaa8dc9206420 Mon Sep 17 00:00:00 2001
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From: Rich Felker <dalias@aerifal.cx>
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Date: Tue, 29 Mar 2016 21:22:52 -0400
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Subject: [PATCH] fix regression disabling use of pause instruction for x86
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a_spin
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commits e24984efd5c6ac5ea8e6cb6cd914fa8435d458bc and
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16b55298dc4b6a54d287d7494e04542667ef8861 inadvertently disabled the
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a_spin implementations for i386, x86_64, and x32 by defining a macro
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named a_pause instead of a_spin. this should not have caused any
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functional regression, but it inhibited cpu relaxation while spinning
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for locks.
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bug reported by George Kulakowski.
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---
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arch/i386/atomic_arch.h | 2 +-
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arch/x32/atomic_arch.h | 2 +-
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arch/x86_64/atomic_arch.h | 2 +-
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3 files changed, 3 insertions(+), 3 deletions(-)
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diff --git a/arch/i386/atomic_arch.h b/arch/i386/atomic_arch.h
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index 6e67c4c..2b1a049 100644
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--- a/arch/i386/atomic_arch.h
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+++ b/arch/i386/atomic_arch.h
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@@ -71,7 +71,7 @@ static inline void a_barrier()
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__asm__ __volatile__( "" : : : "memory" );
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}
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-#define a_pause a_pause
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+#define a_spin a_spin
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static inline void a_spin()
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{
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__asm__ __volatile__( "pause" : : : "memory" );
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diff --git a/arch/x32/atomic_arch.h b/arch/x32/atomic_arch.h
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index 26098d3..7daf4ae 100644
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--- a/arch/x32/atomic_arch.h
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+++ b/arch/x32/atomic_arch.h
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@@ -87,7 +87,7 @@ static inline void a_barrier()
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__asm__ __volatile__( "" : : : "memory" );
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}
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-#define a_pause a_pause
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+#define a_spin a_spin
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static inline void a_spin()
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{
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__asm__ __volatile__( "pause" : : : "memory" );
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diff --git a/arch/x86_64/atomic_arch.h b/arch/x86_64/atomic_arch.h
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index 9f47f80..55fc6fb 100644
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--- a/arch/x86_64/atomic_arch.h
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+++ b/arch/x86_64/atomic_arch.h
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@@ -96,7 +96,7 @@ static inline void a_barrier()
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__asm__ __volatile__( "" : : : "memory" );
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}
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-#define a_pause a_pause
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+#define a_spin a_spin
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static inline void a_spin()
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{
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__asm__ __volatile__( "pause" : : : "memory" );
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--
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2.7.4
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