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Message-ID: <534C2BE6.3070907@gmail.com>
Date: Mon, 14 Apr 2014 14:41:42 -0400
From: Pranith Kumar <bobby.prani@...il.com>
To: catalin.marinas@....com, will.deacon@....com
CC: LKML <linux-kernel@...r.kernel.org>, Joe Perches <joe@...ches.com>
Subject: [RFC PATCH 1/1] prefetch result for ARM64 atomic ops
Prefetch destination as is being done for ARM32
Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
---
arch/arm64/include/asm/atomic.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/arm64/include/asm/atomic.h b/arch/arm64/include/asm/atomic.h
index 0237f08..845f9be 100644
--- a/arch/arm64/include/asm/atomic.h
+++ b/arch/arm64/include/asm/atomic.h
@@ -48,6 +48,7 @@ static inline void atomic_add(int i, atomic_t *v)
unsigned long tmp;
int result;
+ prefetchw(&v->counter);
asm volatile("// atomic_add\n"
"1: ldxr %w0, %2\n"
" add %w0, %w0, %w3\n"
@@ -62,6 +63,7 @@ static inline int atomic_add_return(int i, atomic_t *v)
unsigned long tmp;
int result;
+ prefetchw(&v->counter);
asm volatile("// atomic_add_return\n"
"1: ldxr %w0, %2\n"
" add %w0, %w0, %w3\n"
@@ -80,6 +82,7 @@ static inline void atomic_sub(int i, atomic_t *v)
unsigned long tmp;
int result;
+ prefetchw(&v->counter);
asm volatile("// atomic_sub\n"
"1: ldxr %w0, %2\n"
" sub %w0, %w0, %w3\n"
@@ -94,6 +97,7 @@ static inline int atomic_sub_return(int i, atomic_t *v)
unsigned long tmp;
int result;
+ prefetchw(&v->counter);
asm volatile("// atomic_sub_return\n"
"1: ldxr %w0, %2\n"
" sub %w0, %w0, %w3\n"
@@ -113,6 +117,7 @@ static inline int atomic_cmpxchg(atomic_t *ptr, int old, int new)
int oldval;
smp_mb();
+ prefetchw(&ptr->counter);
asm volatile("// atomic_cmpxchg\n"
"1: ldxr %w1, %2\n"
@@ -170,6 +175,7 @@ static inline void atomic64_add(u64 i, atomic64_t *v)
long result;
unsigned long tmp;
+ prefetchw(&v->counter);
asm volatile("// atomic64_add\n"
"1: ldxr %0, %2\n"
" add %0, %0, %3\n"
@@ -184,6 +190,7 @@ static inline long atomic64_add_return(long i, atomic64_t *v)
long result;
unsigned long tmp;
+ prefetchw(&v->counter);
asm volatile("// atomic64_add_return\n"
"1: ldxr %0, %2\n"
" add %0, %0, %3\n"
@@ -202,6 +209,7 @@ static inline void atomic64_sub(u64 i, atomic64_t *v)
long result;
unsigned long tmp;
+ prefetchw(&v->counter);
asm volatile("// atomic64_sub\n"
"1: ldxr %0, %2\n"
" sub %0, %0, %3\n"
@@ -216,6 +224,7 @@ static inline long atomic64_sub_return(long i, atomic64_t *v)
long result;
unsigned long tmp;
+ prefetchw(&v->counter);
asm volatile("// atomic64_sub_return\n"
"1: ldxr %0, %2\n"
" sub %0, %0, %3\n"
@@ -235,6 +244,7 @@ static inline long atomic64_cmpxchg(atomic64_t *ptr, long old, long new)
unsigned long res;
smp_mb();
+ prefetchw(&v->counter);
asm volatile("// atomic64_cmpxchg\n"
"1: ldxr %1, %2\n"
@@ -258,6 +268,7 @@ static inline long atomic64_dec_if_positive(atomic64_t *v)
long result;
unsigned long tmp;
+ prefetchw(&v->counter);
asm volatile("// atomic64_dec_if_positive\n"
"1: ldxr %0, %2\n"
" subs %0, %0, #1\n"
--
1.9.1
--
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