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Index: sys/sys/atomic_common.h
===================================================================
--- sys/sys/atomic_common.h
+++ sys/sys/atomic_common.h
@@ -36,38 +36,97 @@
#error do not include this header, use machine/atomic.h
#endif
-#define atomic_load_char(p) (*(volatile u_char *)(p))
-#define atomic_load_short(p) (*(volatile u_short *)(p))
-#define atomic_load_int(p) (*(volatile u_int *)(p))
-#define atomic_load_long(p) (*(volatile u_long *)(p))
-#define atomic_load_ptr(p) (*(volatile __typeof(*p) *)(p))
-#define atomic_load_8(p) (*(volatile uint8_t *)(p))
-#define atomic_load_16(p) (*(volatile uint16_t *)(p))
-#define atomic_load_32(p) (*(volatile uint32_t *)(p))
-#ifdef _LP64
-#define atomic_load_64(p) (*(volatile uint64_t *)(p))
-#endif
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#define __atomic_load_char(p) (*(volatile u_char *)(p))
+#define __atomic_load_short(p) (*(volatile u_short *)(p))
+#define __atomic_load_int(p) (*(volatile u_int *)(p))
+#define __atomic_load_long(p) (*(volatile u_long *)(p))
+#define __atomic_load_8(p) (*(volatile uint8_t *)(p))
+#define __atomic_load_16(p) (*(volatile uint16_t *)(p))
+#define __atomic_load_32(p) (*(volatile uint32_t *)(p))
+#define __atomic_load_64(p) (*(volatile uint64_t *)(p))
-#define atomic_store_char(p, v) \
+#define __atomic_store_char(p, v) \
(*(volatile u_char *)(p) = (u_char)(v))
-#define atomic_store_short(p, v) \
+#define __atomic_store_short(p, v) \
(*(volatile u_short *)(p) = (u_short)(v))
-#define atomic_store_int(p, v) \
+#define __atomic_store_int(p, v) \
(*(volatile u_int *)(p) = (u_int)(v))
-#define atomic_store_long(p, v) \
+#define __atomic_store_long(p, v) \
(*(volatile u_long *)(p) = (u_long)(v))
-#define atomic_store_ptr(p, v) \
- (*(volatile __typeof(*p) *)(p) = (v))
-#define atomic_store_8(p, v) \
+#define __atomic_store_8(p, v) \
(*(volatile uint8_t *)(p) = (uint8_t)(v))
-#define atomic_store_16(p, v) \
+#define __atomic_store_16(p, v) \
(*(volatile uint16_t *)(p) = (uint16_t)(v))
-#define atomic_store_32(p, v) \
+#define __atomic_store_32(p, v) \
(*(volatile uint32_t *)(p) = (uint32_t)(v))
-#ifdef _LP64
-#define atomic_store_64(p, v) \
+#define __atomic_store_64(p, v) \
(*(volatile uint64_t *)(p) = (uint64_t)(v))
+
+/*
+ * When _Generic is available, try to provide some type checking.
+ */
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) || \
+ __has_extension(c_generic_selections)
+#define __atomic_load_generic(p, t, ut, n) \
+ _Generic(*(p), \
+ t: __atomic_load_ ## n (p), ut: __atomic_load_ ## n (p))
+#define atomic_load_char(p) __atomic_load_generic(p, char, u_char, char)
+#define atomic_load_short(p) __atomic_load_generic(p, short, u_short, short)
+#define atomic_load_int(p) __atomic_load_generic(p, int, u_int, int)
+#define atomic_load_long(p) __atomic_load_generic(p, long, u_long, long)
+#define atomic_load_8(p) __atomic_load_generic(p, int8_t, uint8_t, 8)
+#define atomic_load_16(p) __atomic_load_generic(p, int16_t, uint16_t, 16)
+#define atomic_load_32(p) __atomic_load_generic(p, int32_t, uint32_t, 32)
+#ifdef __LP64__
+#define atomic_load_64(p) __atomic_load_generic(p, int64_t, uint64_t, 64)
+#endif
+#define __atomic_store_generic(p, v, t, ut, n) \
+ _Generic(*(p), \
+ t: __atomic_store_ ## n (p, v), ut: __atomic_store_ ## n (p, v))
+#define atomic_store_char(p, v) \
+ __atomic_store_generic(p, v, char, u_char, char)
+#define atomic_store_short(p, v) \
+ __atomic_store_generic(p, v, short, u_short, short)
+#define atomic_store_int(p, v) \
+ __atomic_store_generic(p, v, int, u_int, int)
+#define atomic_store_long(p, v) \
+ __atomic_store_generic(p, v, long, u_long, long)
+#define atomic_store_8(p, v) \
+ __atomic_store_generic(p, v, int8_t, uint8_t, 8)
+#define atomic_store_16(p, v) \
+ __atomic_store_generic(p, v, int16_t, uint16_t, 16)
+#define atomic_store_32(p, v) \
+ __atomic_store_generic(p, v, int32_t, uint32_t, 32)
+#define atomic_store_64(p, v) \
+ __atomic_store_generic(p, v, int64_t, uint64_t, 64)
+#else /* !C11 */
+#define atomic_load_char(p) __atomic_load_char(p)
+#define atomic_load_short(p) __atomic_load_short(p)
+#define atomic_load_int(p) __atomic_load_int(p)
+#define atomic_load_long(p) __atomic_load_long(p)
+#define atomic_load_8(p) __atomic_load_8(p)
+#define atomic_load_16(p) __atomic_load_16(p)
+#define atomic_load_32(p) __atomic_load_32(p)
+#ifdef __LP64__
+#define atomic_load_64(p) __atomic_load_64(p)
#endif
+#define atomic_store_char(p, v) __atomic_store_char(p, v)
+#define atomic_store_short(p, v) __atomic_store_short(p, v)
+#define atomic_store_int(p, v) __atomic_store_int(p, v)
+#define atomic_store_long(p, v) __atomic_store_long(p, v)
+#define atomic_store_8(p, v) __atomic_store_8(p, v)
+#define atomic_store_16(p, v) __atomic_store_16(p, v)
+#define atomic_store_32(p, v) __atomic_store_32(p, v)
+#ifdef __LP64__
+#define atomic_store_64(p, v) __atomic_store_64(p, v)
+#endif
+#endif /* C11 */
+
+#define atomic_load_ptr(p) (*(volatile __typeof(*p) *)(p))
+#define atomic_store_ptr(p, v) (*(volatile __typeof(*p) *)(p) = (v))
/*
* Currently all architectures provide acquire and release fences on their own,

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