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Diffstat (limited to 'arch/x86/include/asm/qspinlock.h')
-rw-r--r--arch/x86/include/asm/qspinlock.h25
1 files changed, 24 insertions, 1 deletions
diff --git a/arch/x86/include/asm/qspinlock.h b/arch/x86/include/asm/qspinlock.h
index eaba08076030..9e78e963afb8 100644
--- a/arch/x86/include/asm/qspinlock.h
+++ b/arch/x86/include/asm/qspinlock.h
@@ -4,6 +4,29 @@
#include <asm/cpufeature.h>
#include <asm-generic/qspinlock_types.h>
#include <asm/paravirt.h>
+#include <asm/rmwcc.h>
+
+#define _Q_PENDING_LOOPS (1 << 9)
+
+#define queued_fetch_set_pending_acquire queued_fetch_set_pending_acquire
+
+static __always_inline bool __queued_RMW_btsl(struct qspinlock *lock)
+{
+ GEN_BINARY_RMWcc(LOCK_PREFIX "btsl", lock->val.counter,
+ "I", _Q_PENDING_OFFSET, "%0", c);
+}
+
+static __always_inline u32 queued_fetch_set_pending_acquire(struct qspinlock *lock)
+{
+ u32 val = 0;
+
+ if (__queued_RMW_btsl(lock))
+ val |= _Q_PENDING_VAL;
+
+ val |= atomic_read(&lock->val) & ~_Q_PENDING_MASK;
+
+ return val;
+}
#define queued_spin_unlock queued_spin_unlock
/**
@@ -14,7 +37,7 @@
*/
static inline void native_queued_spin_unlock(struct qspinlock *lock)
{
- smp_store_release((u8 *)lock, 0);
+ smp_store_release(&lock->locked, 0);
}
#ifdef CONFIG_PARAVIRT_SPINLOCKS