1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ 2 #ifndef _TOOLS_LINUX_RING_BUFFER_H_ 3 #define _TOOLS_LINUX_RING_BUFFER_H_ 4 5 #include <linux/compiler.h> 6 ring_buffer_read_head(struct perf_event_mmap_page * base)7static inline __u64 ring_buffer_read_head(struct perf_event_mmap_page *base) 8 { 9 return smp_load_acquire(&base->data_head); 10 } 11 ring_buffer_write_tail(struct perf_event_mmap_page * base,__u64 tail)12static inline void ring_buffer_write_tail(struct perf_event_mmap_page *base, 13 __u64 tail) 14 { 15 smp_store_release(&base->data_tail, tail); 16 } 17 18 #endif /* _TOOLS_LINUX_RING_BUFFER_H_ */ 19