1 files changed, 28 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/atomic.h b/arch/microblaze/include/asm/atomic.h
new file mode 100644
index 000000000..41e9aff23
--- /dev/null
+++ b/arch/microblaze/include/asm/atomic.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_MICROBLAZE_ATOMIC_H
+#define _ASM_MICROBLAZE_ATOMIC_H
+
+#include <asm/cmpxchg.h>
+#include <asm-generic/atomic.h>
+#include <asm-generic/atomic64.h>
+
+/*
+ * Atomically test *v and decrement if it is greater than 0.
+ * The function returns the old value of *v minus 1.
+ */
+static inline int atomic_dec_if_positive(atomic_t *v)
+{
+	unsigned long flags;
+	int res;
+
+	local_irq_save(flags);
+	res = v->counter - 1;
+	if (res >= 0)
+		v->counter = res;
+	local_irq_restore(flags);
+
+	return res;
+}
+#define atomic_dec_if_positive atomic_dec_if_positive
+
+#endif /* _ASM_MICROBLAZE_ATOMIC_H */