local_sub
#define __local_sub(i, l) local_sub((i), (l))
#define local64_sub(i,l) local_sub((i),(&(l)->a))
local_sub(wakeup_events, &rb->events);
local_sub(rb_page_commit(to_remove_page), &cpu_buffer->entries_bytes);
local_sub(rb_page_commit(next_page), &cpu_buffer->entries_bytes);
local_sub(length, &tail_page->write);
local_sub(length, &tail_page->write);
local_sub(length, &tail_page->write);
local_sub(event_length, &cpu_buffer->entries_bytes);