From: Waiman Long <Waiman.Long@hpe.com>
To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org,
linux-s390@vger.kernel.org, linux-arch@vger.kernel.org,
linux-doc@vger.kernel.org, Davidlohr Bueso <dave@stgolabs.net>,
Jason Low <jason.low2@hp.com>, Dave Chinner <david@fromorbit.com>,
Jonathan Corbet <corbet@lwn.net>,
Scott J Norton <scott.norton@hpe.com>,
Douglas Hatch <doug.hatch@hpe.com>,
Waiman Long <Waiman.Long@hpe.com>
Subject: [RFC PATCH-tip/locking/core v3 06/10] locking/rwsem: Move common rwsem macros to asm-generic/rwsem_types.h
Date: Fri, 17 Jun 2016 11:41:32 -0400 [thread overview]
Message-ID: <1466178096-5623-7-git-send-email-Waiman.Long@hpe.com> (raw)
In-Reply-To: <1466178096-5623-1-git-send-email-Waiman.Long@hpe.com>
Almost all the macro definitions in the various architecture specific
rwsem.h header files are essentially the same. This patch moves all
of them into a common header asm-generic/rwsem_types.h to eliminate
the duplication.
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Waiman Long <Waiman.Long@hpe.com>
---
arch/alpha/include/asm/rwsem.h | 8 +-------
arch/ia64/include/asm/rwsem.h | 7 ++-----
arch/s390/include/asm/rwsem.h | 7 +------
arch/x86/include/asm/rwsem.h | 19 +------------------
include/asm-generic/rwsem.h | 16 +---------------
include/asm-generic/rwsem_types.h | 26 ++++++++++++++++++++++++++
6 files changed, 32 insertions(+), 51 deletions(-)
create mode 100644 include/asm-generic/rwsem_types.h
diff --git a/arch/alpha/include/asm/rwsem.h b/arch/alpha/include/asm/rwsem.h
index 77873d0..f99e39a 100644
--- a/arch/alpha/include/asm/rwsem.h
+++ b/arch/alpha/include/asm/rwsem.h
@@ -13,13 +13,7 @@
#ifdef __KERNEL__
#include <linux/compiler.h>
-
-#define RWSEM_UNLOCKED_VALUE 0x0000000000000000L
-#define RWSEM_ACTIVE_BIAS 0x0000000000000001L
-#define RWSEM_ACTIVE_MASK 0x00000000ffffffffL
-#define RWSEM_WAITING_BIAS (-0x0000000100000000L)
-#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
-#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
+#include <asm-generic/rwsem_types.h>
static inline void __down_read(struct rw_semaphore *sem)
{
diff --git a/arch/ia64/include/asm/rwsem.h b/arch/ia64/include/asm/rwsem.h
index 8fa98dd..21a9066 100644
--- a/arch/ia64/include/asm/rwsem.h
+++ b/arch/ia64/include/asm/rwsem.h
@@ -26,13 +26,10 @@
#endif
#include <asm/intrinsics.h>
+#include <asm-generic/rwsem_types.h>
+#undef RWSEM_UNLOCKED_VALUE
#define RWSEM_UNLOCKED_VALUE __IA64_UL_CONST(0x0000000000000000)
-#define RWSEM_ACTIVE_BIAS (1L)
-#define RWSEM_ACTIVE_MASK (0xffffffffL)
-#define RWSEM_WAITING_BIAS (-0x100000000L)
-#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
-#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
/*
* lock for reading
diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h
index 597e7e9..13dedc8 100644
--- a/arch/s390/include/asm/rwsem.h
+++ b/arch/s390/include/asm/rwsem.h
@@ -39,12 +39,7 @@
#error "please don't include asm/rwsem.h directly, use linux/rwsem.h instead"
#endif
-#define RWSEM_UNLOCKED_VALUE 0x0000000000000000L
-#define RWSEM_ACTIVE_BIAS 0x0000000000000001L
-#define RWSEM_ACTIVE_MASK 0x00000000ffffffffL
-#define RWSEM_WAITING_BIAS (-0x0000000100000000L)
-#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
-#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
+#include <asm-generic/rwsem_types.h>
/*
* lock for reading
diff --git a/arch/x86/include/asm/rwsem.h b/arch/x86/include/asm/rwsem.h
index 089ced4..c6d155e 100644
--- a/arch/x86/include/asm/rwsem.h
+++ b/arch/x86/include/asm/rwsem.h
@@ -38,24 +38,7 @@
#ifdef __KERNEL__
#include <asm/asm.h>
-
-/*
- * The bias values and the counter type limits the number of
- * potential readers/writers to 32767 for 32 bits and 2147483647
- * for 64 bits.
- */
-
-#ifdef CONFIG_X86_64
-# define RWSEM_ACTIVE_MASK 0xffffffffL
-#else
-# define RWSEM_ACTIVE_MASK 0x0000ffffL
-#endif
-
-#define RWSEM_UNLOCKED_VALUE 0x00000000L
-#define RWSEM_ACTIVE_BIAS 0x00000001L
-#define RWSEM_WAITING_BIAS (-RWSEM_ACTIVE_MASK-1)
-#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
-#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
+#include <asm-generic/rwsem_types.h>
/*
* lock for reading
diff --git a/include/asm-generic/rwsem.h b/include/asm-generic/rwsem.h
index 5be122e..3cb8d98 100644
--- a/include/asm-generic/rwsem.h
+++ b/include/asm-generic/rwsem.h
@@ -12,21 +12,7 @@
* Adapted largely from include/asm-i386/rwsem.h
* by Paul Mackerras <paulus@samba.org>.
*/
-
-/*
- * the semaphore definition
- */
-#ifdef CONFIG_64BIT
-# define RWSEM_ACTIVE_MASK 0xffffffffL
-#else
-# define RWSEM_ACTIVE_MASK 0x0000ffffL
-#endif
-
-#define RWSEM_UNLOCKED_VALUE 0x00000000L
-#define RWSEM_ACTIVE_BIAS 0x00000001L
-#define RWSEM_WAITING_BIAS (-RWSEM_ACTIVE_MASK-1)
-#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
-#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
+#include <asm-generic/rwsem_types.h>
/*
* lock for reading
diff --git a/include/asm-generic/rwsem_types.h b/include/asm-generic/rwsem_types.h
new file mode 100644
index 0000000..093ef6a
--- /dev/null
+++ b/include/asm-generic/rwsem_types.h
@@ -0,0 +1,26 @@
+#ifndef _ASM_GENERIC_RWSEM_TYPES_H
+#define _ASM_GENERIC_RWSEM_TYPES_H
+
+#ifdef __KERNEL__
+
+/*
+ * the semaphore definition
+ *
+ * The bias values and the counter type limits the number of
+ * potential readers/writers to 32767 for 32 bits and 2147483647
+ * for 64 bits.
+ */
+#ifdef CONFIG_64BIT
+# define RWSEM_ACTIVE_MASK 0xffffffffL
+#else
+# define RWSEM_ACTIVE_MASK 0x0000ffffL
+#endif
+
+#define RWSEM_UNLOCKED_VALUE 0x00000000L
+#define RWSEM_ACTIVE_BIAS 0x00000001L
+#define RWSEM_WAITING_BIAS (-RWSEM_ACTIVE_MASK-1)
+#define RWSEM_ACTIVE_READ_BIAS RWSEM_ACTIVE_BIAS
+#define RWSEM_ACTIVE_WRITE_BIAS (RWSEM_WAITING_BIAS + RWSEM_ACTIVE_BIAS)
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_GENERIC_RWSEM_TYPES_H */
--
1.7.1
next prev parent reply other threads:[~2016-06-17 15:41 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-17 15:41 [RFC PATCH-tip/locking/core v3 00/10] locking/rwsem: Enable reader optimistic spinning Waiman Long
2016-06-17 15:41 ` Waiman Long
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 01/10] locking/osq: Make lock/unlock proper acquire/release barrier Waiman Long
2016-06-17 15:41 ` Waiman Long
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 02/10] locking/rwsem: Stop active read lock ASAP Waiman Long
2016-06-17 15:41 ` Waiman Long
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 03/10] locking/rwsem: Make rwsem_spin_on_owner() return a tri-state value Waiman Long
2016-06-17 15:41 ` Waiman Long
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 04/10] locking/rwsem: Enable count-based spinning on reader Waiman Long
2016-06-17 15:41 ` Waiman Long
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 05/10] locking/rwsem: move down rwsem_down_read_failed function Waiman Long
2016-06-17 15:41 ` Waiman Long
2016-06-17 15:41 ` Waiman Long [this message]
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 06/10] locking/rwsem: Move common rwsem macros to asm-generic/rwsem_types.h Waiman Long
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 07/10] locking/rwsem: Change RWSEM_WAITING_BIAS for better disambiguation Waiman Long
2016-06-17 15:41 ` Waiman Long
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 08/10] locking/rwsem: Enable spinning readers Waiman Long
2016-06-17 15:41 ` Waiman Long
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 09/10] locking/rwsem: Enable reactivation of reader spinning Waiman Long
2016-06-17 15:41 ` Waiman Long
2016-06-17 15:41 ` [RFC PATCH-tip/locking/core v3 10/10] locking/rwsem: Add a boot parameter to reader spinning threshold Waiman Long
2016-06-17 15:41 ` Waiman Long
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