From 1a538b9c2bb6cd97cf5e38ba15a52acafcdccc6e Mon Sep 17 00:00:00 2001
From: Ralf Baechle <ralf@linux-mips.org>
Date: Thu, 9 Mar 2000 15:44:17 +0000
Subject: One more itsy bitsy tiny SMP bit ...

---
 include/asm-mips64/smplock.h | 54 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 include/asm-mips64/smplock.h

diff --git a/include/asm-mips64/smplock.h b/include/asm-mips64/smplock.h
new file mode 100644
index 000000000..ad3bfd6ad
--- /dev/null
+++ b/include/asm-mips64/smplock.h
@@ -0,0 +1,54 @@
+/*
+ * <asm/smplock.h>
+ *
+ * Default SMP lock implementation
+ */
+#ifndef __ASM_SMPLOCK_H
+#define __ASM_SMPLOCK_H
+
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+
+extern spinlock_t kernel_flag;
+
+/*
+ * Release global kernel lock and global interrupt lock
+ */
+static __inline__ void release_kernel_lock(struct task_struct *task, int cpu)
+{
+	if (task->lock_depth >= 0)
+		spin_unlock(&kernel_flag);
+	release_irqlock(cpu);
+	__sti();
+}
+
+/*
+ * Re-acquire the kernel lock
+ */
+static __inline__ void reacquire_kernel_lock(struct task_struct *task)
+{
+	if (task->lock_depth >= 0)
+		spin_lock(&kernel_flag);
+}
+
+/*
+ * Getting the big kernel lock.
+ *
+ * This cannot happen asynchronously,
+ * so we only need to worry about other
+ * CPU's.
+ */
+static __inline__ void lock_kernel(void)
+{
+	if (!++current->lock_depth)
+		spin_lock(&kernel_flag);
+}
+
+static __inline__ void unlock_kernel(void)
+{
+	if (--current->lock_depth < 0)
+		spin_unlock(&kernel_flag);
+}
+
+#endif /* __ASM_SMPLOCK_H */
-- 
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