patch-2.4.2 linux/include/asm-s390x/smplock.h

• Lines: 63
• Date: Tue Feb 13 14:13:44 2001
• Orig file: v2.4.1/linux/include/asm-s390x/smplock.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/include/asm-s390x/smplock.h linux/include/asm-s390x/smplock.h
@@ -0,0 +1,62 @@
+/*
+ *  include/asm-s390/smplock.h
+ *
+ *  S390 version
+ *
+ *  Derived from "include/asm-i386/smplock.h"
+ */
+
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+
+extern spinlock_t kernel_flag;
+
+#define kernel_locked()                spin_is_locked(&kernel_flag)
+
+/*
+ * Release global kernel lock and global interrupt lock
+ */
+#define release_kernel_lock(task, cpu)     \
+do {                                       \
+	if (task->lock_depth >= 0)         \
+		spin_unlock(&kernel_flag); \
+	release_irqlock(cpu);              \
+	__sti();                           \
+} while (0)
+
+/*
+ * Re-acquire the kernel lock
+ */
+#define reacquire_kernel_lock(task)        \
+do {                                       \
+	if (task->lock_depth >= 0)         \
+		spin_lock(&kernel_flag);   \
+} while (0)
+
+
+/*
+ * Getting the big kernel lock.
+ *
+ * This cannot happen asynchronously,
+ * so we only need to worry about other
+ * CPU's.
+ */
+/*
+ * Getting the big kernel lock.
+ *
+ * This cannot happen asynchronously,
+ * so we only need to worry about other
+ * CPU's.
+ */
+extern __inline__ void lock_kernel(void)
+{
+        if (!++current->lock_depth)
+                spin_lock(&kernel_flag);
+}
+
+extern __inline__ void unlock_kernel(void)
+{
+        if (--current->lock_depth < 0)
+                spin_unlock(&kernel_flag);
+}
+