714 	struct perf_mmap *md = &evlist->mmap[idx];  in perf_evlist__mmap_read()  local
716 	u64 old = md->prev;  in perf_evlist__mmap_read()
717 	unsigned char *data = md->base + page_size;  in perf_evlist__mmap_read()
723 	if (!atomic_read(&md->refcnt))  in perf_evlist__mmap_read()
726 	head = perf_mmap__read_head(md);  in perf_evlist__mmap_read()
737 		if (diff > md->mask / 2 || diff < 0) {  in perf_evlist__mmap_read()
750 		event = (union perf_event *)&data[old & md->mask];  in perf_evlist__mmap_read()
757 		if ((old & md->mask) + size != ((old + size) & md->mask)) {  in perf_evlist__mmap_read()
760 			void *dst = md->event_copy;  in perf_evlist__mmap_read()
763 				cpy = min(md->mask + 1 - (offset & md->mask), len);  in perf_evlist__mmap_read()
764 				memcpy(dst, &data[offset & md->mask], cpy);  in perf_evlist__mmap_read()
770 			event = (union perf_event *) md->event_copy;  in perf_evlist__mmap_read()
776 	md->prev = old;  in perf_evlist__mmap_read()
781 static bool perf_mmap__empty(struct perf_mmap *md)  in perf_mmap__empty()  argument
783 	return perf_mmap__read_head(md) == md->prev && !md->auxtrace_mmap.base;  in perf_mmap__empty()
801 	struct perf_mmap *md = &evlist->mmap[idx];  in perf_evlist__mmap_consume()  local
804 		u64 old = md->prev;  in perf_evlist__mmap_consume()
806 		perf_mmap__write_tail(md, old);  in perf_evlist__mmap_consume()
809 	if (atomic_read(&md->refcnt) == 1 && perf_mmap__empty(md))  in perf_evlist__mmap_consume()