linux-kernel - [PATCH] locking/qspinlock: move __ARCH_SPIN_LOCK_UNLOCKED to qspinlock

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Date:	Fri, 19 Feb 2016 13:49:27 -0500
From:	Dan Streetman <dan.streetman@...onical.com>
To:	Waiman Long <Waiman.Long@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnd Bergmann <arnd@...db.de>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dan Streetman <dan.streetman@...onical.com>,
	Dan Streetman <ddstreet@...e.org>
Subject: [PATCH] locking/qspinlock: move __ARCH_SPIN_LOCK_UNLOCKED to qspinlock_types.h

Move __ARCH_SPIN_LOCK_UNLOCKED definition from qspinlock.h into
qspinlock_types.h.

The definition of __ARCH_SPIN_LOCK_UNLOCKED comes from the build arch's
include files; but on x86 when CONFIG_QUEUED_SPINLOCKS is set, it just
it's defined in asm-generic/qspinlock.h.  In most cases, this doesn't
matter because linux/spinlock.h includes asm/spinlock.h, which for x86
includes asm-generic/qspinlock.h.  However, any code that only includes
linux/mutex.h will break, because it only includes asm/spinlock_types.h.

For example, this breaks systemtap, which only includes mutex.h.

Signed-off-by: Dan Streetman <dan.streetman@...onical.com>
Cc: Dan Streetman <ddstreet@...e.org>
---
 include/asm-generic/qspinlock.h       | 5 -----
 include/asm-generic/qspinlock_types.h | 5 +++++
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h
index 39e1cb2..35a52a8 100644
--- a/include/asm-generic/qspinlock.h
+++ b/include/asm-generic/qspinlock.h
@@ -120,11 +120,6 @@ static __always_inline bool virt_spin_lock(struct qspinlock *lock)
 #endif
 
 /*
- * Initializier
- */
-#define	__ARCH_SPIN_LOCK_UNLOCKED	{ ATOMIC_INIT(0) }
-
-/*
  * Remapping spinlock architecture specific functions to the corresponding
  * queued spinlock functions.
  */
diff --git a/include/asm-generic/qspinlock_types.h b/include/asm-generic/qspinlock_types.h
index 85f888e..034acd0 100644
--- a/include/asm-generic/qspinlock_types.h
+++ b/include/asm-generic/qspinlock_types.h
@@ -33,6 +33,11 @@ typedef struct qspinlock {
 } arch_spinlock_t;
 
 /*
+ * Initializier
+ */
+#define	__ARCH_SPIN_LOCK_UNLOCKED	{ ATOMIC_INIT(0) }
+
+/*
  * Bitfields in the atomic value:
  *
  * When NR_CPUS < 16K
-- 
2.5.0