atomic: Add plain atomic_load/store_bool()

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D36078

sys/sys/atomic_common.h

@@ -39,6 +39,10 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 
+#define	__atomic_load_bool_relaxed(p)	(*(volatile _Bool *)(p))
+#define	__atomic_store_bool_relaxed(p, v)	\
+    (*(volatile _Bool *)(p) = (_Bool)(v))
+
 #define	__atomic_load_char_relaxed(p)	(*(volatile u_char *)(p))
 #define	__atomic_load_short_relaxed(p)	(*(volatile u_short *)(p))
 #define	__atomic_load_int_relaxed(p)	(*(volatile u_int *)(p))
@@ -70,6 +74,11 @@
  */
 #if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
     __has_extension(c_generic_selections)
+#define	atomic_load_bool(p)			\
+	_Generic(*(p), _Bool: __atomic_load_bool_relaxed(p))
+#define	atomic_store_bool(p, v)			\
+	_Generic(*(p), _Bool: __atomic_store_bool_relaxed(p, v))
+
 #define	__atomic_load_generic(p, t, ut, n)	\
 	_Generic(*(p),				\
 	    t: __atomic_load_ ## n ## _relaxed(p), ut: __atomic_load_ ## n ## _relaxed(p))
@@ -77,6 +86,8 @@
 	_Generic(*(p),				\
 	    t: __atomic_store_ ## n ## _relaxed(p, v), ut: __atomic_store_ ## n ## _relaxed(p, v))
 #else
+#define	atomic_load_bool(p)			__atomic_load_bool_relaxed(p)
+#define	atomic_store_bool(p, v)			__atomic_store_bool_relaxed(p, v)
 #define	__atomic_load_generic(p, t, ut, n)	__atomic_load_ ## n ## _relaxed(p)
 #define	__atomic_store_generic(p, v, t, ut, n)	__atomic_store_ ## n ## _relaxed(p, v)
 #endif