724 	struct io_sample *prev;  in pid_begin_io_sample()  local
735 	prev = c->io_samples;  in pid_begin_io_sample()
737 	if (prev && prev->start_time && !prev->end_time) {  in pid_begin_io_sample()
743 		c->io_samples = prev->next;  in pid_begin_io_sample()
744 		free(prev);  in pid_begin_io_sample()
768 	struct io_sample *sample, *prev;  in pid_end_io_sample()  local
792 	prev = sample->next;  in pid_end_io_sample()
798 	if (prev && sample->start_time < prev->end_time) {  in pid_end_io_sample()
799 		if (prev->err) /* try to make errors more visible */  in pid_end_io_sample()
800 			sample->start_time = prev->end_time;  in pid_end_io_sample()
802 			prev->end_time = sample->start_time;  in pid_end_io_sample()
819 	if (prev &&  in pid_end_io_sample()
820 	    prev->type == sample->type &&  in pid_end_io_sample()
821 	    prev->err == sample->err &&  in pid_end_io_sample()
822 	    prev->fd == sample->fd &&  in pid_end_io_sample()
823 	    prev->end_time + tchart->merge_dist >= sample->start_time) {  in pid_end_io_sample()
825 		sample->bytes += prev->bytes;  in pid_end_io_sample()
826 		sample->merges += prev->merges + 1;  in pid_end_io_sample()
828 		sample->start_time = prev->start_time;  in pid_end_io_sample()
829 		sample->next = prev->next;  in pid_end_io_sample()
830 		free(prev);  in pid_end_io_sample()
966 	struct per_pid *new_list, *p, *cursor, *prev;  in sort_pids()  local
981 		prev = NULL;  in sort_pids()
987 				if (prev) {  in sort_pids()
988 					p->next = prev->next;  in sort_pids()
989 					prev->next = p;  in sort_pids()
1000 			prev = cursor;  in sort_pids()
1003 				prev->next = p;  in sort_pids()