1 files changed, 0 insertions, 68 deletions
diff --git a/main/musl/0004-fix-missing-synchronization-in-atomic-store-on-i386-.patch b/main/musl/0004-fix-missing-synchronization-in-atomic-store-on-i386-.patch
deleted file mode 100644
index f3195ff39e..0000000000
--- a/main/musl/0004-fix-missing-synchronization-in-atomic-store-on-i386-.patch
+++ /dev/null
@@ -1,68 +0,0 @@
-From 3c43c0761e1725fd5f89a9c028cbf43250abb913 Mon Sep 17 00:00:00 2001
-From: Rich Felker <dalias@aerifal.cx>
-Date: Tue, 28 Jul 2015 18:40:18 +0000
-Subject: [PATCH] fix missing synchronization in atomic store on i386 and
- x86_64
-
-despite being strongly ordered, the x86 memory model does not preclude
-reordering of loads across earlier stores. while a plain store
-suffices as a release barrier, we actually need a full barrier, since
-users of a_store subsequently load a waiter count to determine whether
-to issue a futex wait, and using a stale count will result in soft
-(fail-to-wake) deadlocks. these deadlocks were observed in malloc and
-possible with stdio locks and other libc-internal locking.
-
-on i386, an atomic operation on the caller's stack is used as the
-barrier rather than performing the store itself using xchg; this
-avoids the need to read the cache line on which the store is being
-performed. mfence is used on x86_64 where it's always available, and
-could be used on i386 with the appropriate cpu model checks if it's
-shown to perform better.
----
- arch/i386/atomic.h   | 2 +-
- arch/x32/atomic.h    | 2 +-
- arch/x86_64/atomic.h | 2 +-
- 3 files changed, 3 insertions(+), 3 deletions(-)
-
-diff --git a/arch/i386/atomic.h b/arch/i386/atomic.h
-index 95fecbd..25441df 100644
---- a/arch/i386/atomic.h
-+++ b/arch/i386/atomic.h
-@@ -88,7 +88,7 @@ static inline void a_dec(volatile int *x)
- 
- static inline void a_store(volatile int *p, int x)
- {
--	__asm__( "movl %1, %0" : "=m"(*p) : "r"(x) : "memory" );
-+	__asm__( "movl %1, %0 ; lock ; orl $0,(%%esp)" : "=m"(*p) : "r"(x) : "memory" );
- }
- 
- static inline void a_spin()
-diff --git a/arch/x32/atomic.h b/arch/x32/atomic.h
-index b2014cc..2ab1f7a 100644
---- a/arch/x32/atomic.h
-+++ b/arch/x32/atomic.h
-@@ -83,7 +83,7 @@ static inline void a_dec(volatile int *x)
- 
- static inline void a_store(volatile int *p, int x)
- {
--	__asm__( "mov %1, %0" : "=m"(*p) : "r"(x) : "memory" );
-+	__asm__( "mov %1, %0 ; mfence" : "=m"(*p) : "r"(x) : "memory" );
- }
- 
- static inline void a_spin()
-diff --git a/arch/x86_64/atomic.h b/arch/x86_64/atomic.h
-index b2014cc..2ab1f7a 100644
---- a/arch/x86_64/atomic.h
-+++ b/arch/x86_64/atomic.h
-@@ -83,7 +83,7 @@ static inline void a_dec(volatile int *x)
- 
- static inline void a_store(volatile int *p, int x)
- {
--	__asm__( "mov %1, %0" : "=m"(*p) : "r"(x) : "memory" );
-+	__asm__( "mov %1, %0 ; mfence" : "=m"(*p) : "r"(x) : "memory" );
- }
- 
- static inline void a_spin()
--- 
-2.4.6
-