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Message-ID: <tip-knswsr5mldkr0w1lrdxvc81w@git.kernel.org>
Date: Fri, 18 Apr 2014 06:12:37 -0700
From: tip-bot for Peter Zijlstra <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
will.deacon@....com, torvalds@...ux-foundation.org,
peterz@...radead.org, davej@...hat.com, paulmck@...ux.vnet.ibm.com,
tglx@...utronix.de, walken@...gle.com, jesse.brandeburg@...el.com
Subject: [tip:locking/core] arch,x86: Convert smp_mb__*()
Commit-ID: d00a569284b1340c16fe2c148099e077ea09ebc9
Gitweb: http://git.kernel.org/tip/d00a569284b1340c16fe2c148099e077ea09ebc9
Author: Peter Zijlstra <peterz@...radead.org>
AuthorDate: Thu, 13 Mar 2014 19:00:35 +0100
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 18 Apr 2014 14:20:46 +0200
arch,x86: Convert smp_mb__*()
x86 is strongly ordered and all its atomic ops imply a full barrier.
Implement the two new primitives as the old ones were.
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-knswsr5mldkr0w1lrdxvc81w@git.kernel.org
Cc: Dave Jones <davej@...hat.com>
Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michel Lespinasse <walken@...gle.com>
Cc: Will Deacon <will.deacon@....com>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
arch/x86/include/asm/atomic.h | 7 +------
arch/x86/include/asm/barrier.h | 4 ++++
arch/x86/include/asm/bitops.h | 6 ++----
arch/x86/include/asm/sync_bitops.h | 2 +-
arch/x86/kernel/apic/hw_nmi.c | 2 +-
5 files changed, 9 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/atomic.h b/arch/x86/include/asm/atomic.h
index b17f4f4..6dd1c7d 100644
--- a/arch/x86/include/asm/atomic.h
+++ b/arch/x86/include/asm/atomic.h
@@ -7,6 +7,7 @@
#include <asm/alternative.h>
#include <asm/cmpxchg.h>
#include <asm/rmwcc.h>
+#include <asm/barrier.h>
/*
* Atomic operations that C can't guarantee us. Useful for
@@ -243,12 +244,6 @@ static inline void atomic_or_long(unsigned long *v1, unsigned long v2)
: : "r" ((unsigned)(mask)), "m" (*(addr)) \
: "memory")
-/* Atomic operations are already serializing on x86 */
-#define smp_mb__before_atomic_dec() barrier()
-#define smp_mb__after_atomic_dec() barrier()
-#define smp_mb__before_atomic_inc() barrier()
-#define smp_mb__after_atomic_inc() barrier()
-
#ifdef CONFIG_X86_32
# include <asm/atomic64_32.h>
#else
diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
index 69bbb48..5c7198c 100644
--- a/arch/x86/include/asm/barrier.h
+++ b/arch/x86/include/asm/barrier.h
@@ -137,6 +137,10 @@ do { \
#endif
+/* Atomic operations are already serializing on x86 */
+#define smp_mb__before_atomic() barrier()
+#define smp_mb__after_atomic() barrier()
+
/*
* Stop RDTSC speculation. This is needed when you need to use RDTSC
* (or get_cycles or vread that possibly accesses the TSC) in a defined
diff --git a/arch/x86/include/asm/bitops.h b/arch/x86/include/asm/bitops.h
index 9fc1af7..afcd35d 100644
--- a/arch/x86/include/asm/bitops.h
+++ b/arch/x86/include/asm/bitops.h
@@ -15,6 +15,7 @@
#include <linux/compiler.h>
#include <asm/alternative.h>
#include <asm/rmwcc.h>
+#include <asm/barrier.h>
#if BITS_PER_LONG == 32
# define _BITOPS_LONG_SHIFT 5
@@ -102,7 +103,7 @@ static inline void __set_bit(long nr, volatile unsigned long *addr)
*
* clear_bit() is atomic and may not be reordered. However, it does
* not contain a memory barrier, so if it is used for locking purposes,
- * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
+ * you should call smp_mb__before_atomic() and/or smp_mb__after_atomic()
* in order to ensure changes are visible on other processors.
*/
static __always_inline void
@@ -156,9 +157,6 @@ static inline void __clear_bit_unlock(long nr, volatile unsigned long *addr)
__clear_bit(nr, addr);
}
-#define smp_mb__before_clear_bit() barrier()
-#define smp_mb__after_clear_bit() barrier()
-
/**
* __change_bit - Toggle a bit in memory
* @nr: the bit to change
diff --git a/arch/x86/include/asm/sync_bitops.h b/arch/x86/include/asm/sync_bitops.h
index 05af3b3..f28a24b 100644
--- a/arch/x86/include/asm/sync_bitops.h
+++ b/arch/x86/include/asm/sync_bitops.h
@@ -41,7 +41,7 @@ static inline void sync_set_bit(long nr, volatile unsigned long *addr)
*
* sync_clear_bit() is atomic and may not be reordered. However, it does
* not contain a memory barrier, so if it is used for locking purposes,
- * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit()
+ * you should call smp_mb__before_atomic() and/or smp_mb__after_atomic()
* in order to ensure changes are visible on other processors.
*/
static inline void sync_clear_bit(long nr, volatile unsigned long *addr)
diff --git a/arch/x86/kernel/apic/hw_nmi.c b/arch/x86/kernel/apic/hw_nmi.c
index a698d71..eab6704 100644
--- a/arch/x86/kernel/apic/hw_nmi.c
+++ b/arch/x86/kernel/apic/hw_nmi.c
@@ -57,7 +57,7 @@ void arch_trigger_all_cpu_backtrace(void)
}
clear_bit(0, &backtrace_flag);
- smp_mb__after_clear_bit();
+ smp_mb__after_atomic();
}
static int __kprobes
--
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