diff options
Diffstat (limited to 'include/qemu/atomic.h')
| -rw-r--r-- | include/qemu/atomic.h | 58 |
1 files changed, 34 insertions, 24 deletions
diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h index 8f1d8d927d..5bc4d6cc47 100644 --- a/include/qemu/atomic.h +++ b/include/qemu/atomic.h @@ -42,30 +42,34 @@ * loads/stores past the atomic operation load/store. However there is * no explicit memory barrier for the processor. */ -#define atomic_read(ptr) \ - ({ \ - typeof(*ptr) _val; \ - __atomic_load(ptr, &_val, __ATOMIC_RELAXED); \ - _val; \ +#define atomic_read(ptr) \ + ({ \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ + typeof(*ptr) _val; \ + __atomic_load(ptr, &_val, __ATOMIC_RELAXED); \ + _val; \ }) -#define atomic_set(ptr, i) do { \ - typeof(*ptr) _val = (i); \ - __atomic_store(ptr, &_val, __ATOMIC_RELAXED); \ +#define atomic_set(ptr, i) do { \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ + typeof(*ptr) _val = (i); \ + __atomic_store(ptr, &_val, __ATOMIC_RELAXED); \ } while(0) /* Atomic RCU operations imply weak memory barriers */ -#define atomic_rcu_read(ptr) \ - ({ \ - typeof(*ptr) _val; \ - __atomic_load(ptr, &_val, __ATOMIC_CONSUME); \ - _val; \ +#define atomic_rcu_read(ptr) \ + ({ \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ + typeof(*ptr) _val; \ + __atomic_load(ptr, &_val, __ATOMIC_CONSUME); \ + _val; \ }) -#define atomic_rcu_set(ptr, i) do { \ - typeof(*ptr) _val = (i); \ - __atomic_store(ptr, &_val, __ATOMIC_RELEASE); \ +#define atomic_rcu_set(ptr, i) do { \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ + typeof(*ptr) _val = (i); \ + __atomic_store(ptr, &_val, __ATOMIC_RELEASE); \ } while(0) /* atomic_mb_read/set semantics map Java volatile variables. They are @@ -79,6 +83,7 @@ #if defined(_ARCH_PPC) #define atomic_mb_read(ptr) \ ({ \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ typeof(*ptr) _val; \ __atomic_load(ptr, &_val, __ATOMIC_RELAXED); \ smp_rmb(); \ @@ -86,22 +91,25 @@ }) #define atomic_mb_set(ptr, i) do { \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ typeof(*ptr) _val = (i); \ smp_wmb(); \ __atomic_store(ptr, &_val, __ATOMIC_RELAXED); \ smp_mb(); \ } while(0) #else -#define atomic_mb_read(ptr) \ - ({ \ - typeof(*ptr) _val; \ - __atomic_load(ptr, &_val, __ATOMIC_SEQ_CST); \ - _val; \ +#define atomic_mb_read(ptr) \ + ({ \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ + typeof(*ptr) _val; \ + __atomic_load(ptr, &_val, __ATOMIC_SEQ_CST); \ + _val; \ }) -#define atomic_mb_set(ptr, i) do { \ - typeof(*ptr) _val = (i); \ - __atomic_store(ptr, &_val, __ATOMIC_SEQ_CST); \ +#define atomic_mb_set(ptr, i) do { \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ + typeof(*ptr) _val = (i); \ + __atomic_store(ptr, &_val, __ATOMIC_SEQ_CST); \ } while(0) #endif @@ -109,6 +117,7 @@ /* All the remaining operations are fully sequentially consistent */ #define atomic_xchg(ptr, i) ({ \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ typeof(*ptr) _new = (i), _old; \ __atomic_exchange(ptr, &_new, &_old, __ATOMIC_SEQ_CST); \ _old; \ @@ -117,6 +126,7 @@ /* Returns the eventual value, failed or not */ #define atomic_cmpxchg(ptr, old, new) \ ({ \ + QEMU_BUILD_BUG_ON(sizeof(*ptr) > sizeof(void *)); \ typeof(*ptr) _old = (old), _new = (new); \ __atomic_compare_exchange(ptr, &_old, &_new, false, \ __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \ |