Setup development environment with libbpf

external/libbpf-bootstrap/libbpf/include/linux/compiler.h

@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+
+#ifndef __LINUX_COMPILER_H
+#define __LINUX_COMPILER_H
+
+#define likely(x)		__builtin_expect(!!(x), 1)
+#define unlikely(x)		__builtin_expect(!!(x), 0)
+
+#define READ_ONCE(x)		(*(volatile typeof(x) *)&x)
+#define WRITE_ONCE(x, v)	(*(volatile typeof(x) *)&x) = (v)
+
+#define barrier()		asm volatile("" ::: "memory")
+
+#if defined(__x86_64__)
+
+# define smp_rmb()		barrier()
+# define smp_wmb()		barrier()
+# define smp_mb()		asm volatile("lock; addl $0,-132(%%rsp)" ::: "memory", "cc")
+
+# define smp_store_release(p, v)		\
+do {						\
+	barrier();				\
+	WRITE_ONCE(*p, v);			\
+} while (0)
+
+# define smp_load_acquire(p)			\
+({						\
+	typeof(*p) ___p = READ_ONCE(*p);	\
+	barrier();				\
+	___p;					\
+})
+
+#elif defined(__aarch64__)
+
+# define smp_rmb()		asm volatile("dmb ishld" ::: "memory")
+# define smp_wmb()		asm volatile("dmb ishst" ::: "memory")
+# define smp_mb()		asm volatile("dmb ish" ::: "memory")
+
+#endif
+
+#ifndef smp_mb
+# define smp_mb()		__sync_synchronize()
+#endif
+
+#ifndef smp_rmb
+# define smp_rmb()		smp_mb()
+#endif
+
+#ifndef smp_wmb
+# define smp_wmb()		smp_mb()
+#endif
+
+#ifndef smp_store_release
+# define smp_store_release(p, v)		\
+do {						\
+	smp_mb();				\
+	WRITE_ONCE(*p, v);			\
+} while (0)
+#endif
+
+#ifndef smp_load_acquire
+# define smp_load_acquire(p)			\
+({						\
+	typeof(*p) ___p = READ_ONCE(*p);	\
+	smp_mb();				\
+	___p;					\
+})
+#endif
+
+#endif /* __LINUX_COMPILER_H */