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sys/compat/linuxkpi/common/include/asm/atomic.h
| Show First 20 Lines • Show All 153 Lines • ▼ Show 20 Lines | if (atomic_cmpset_int(&v->counter, old, new)) | ||||
| break; | break; | ||||
| ret = READ_ONCE(v->counter); | ret = READ_ONCE(v->counter); | ||||
| if (ret != old) | if (ret != old) | ||||
| break; | break; | ||||
| } | } | ||||
| return (ret); | return (ret); | ||||
| } | } | ||||
| static inline int | |||||
| atomic_dec_if_positive(atomic_t *v) { | |||||
| int c, old, dec; | |||||
| c = atomic_read(v); | |||||
| for (;;) { | |||||
| dec = c - 1; | |||||
| if (unlikely(dec < 0)) | |||||
| break; | |||||
| old = atomic_cmpxchg((v), c, dec); | |||||
| if (likely(old == c)) | |||||
| break; | |||||
| c = old; | |||||
| } | |||||
| return dec; | |||||
| } | |||||
| #define cmpxchg(ptr, old, new) ({ \ | #define cmpxchg(ptr, old, new) ({ \ | ||||
| union { \ | union { \ | ||||
| __typeof(*(ptr)) val; \ | __typeof(*(ptr)) val; \ | ||||
| u8 u8[0]; \ | u8 u8[0]; \ | ||||
| u16 u16[0]; \ | u16 u16[0]; \ | ||||
| u32 u32[0]; \ | u32 u32[0]; \ | ||||
| u64 u64[0]; \ | u64 u64[0]; \ | ||||
| } __ret = { .val = (old) }, __new = { .val = (new) }; \ | } __ret = { .val = (old) }, __new = { .val = (new) }; \ | ||||
| ▲ Show 20 Lines • Show All 101 Lines • Show Last 20 Lines | |||||