struct lib_ring_buffer_backend_pages *rpages;
unsigned long sb_bindex, id;
+ if (unlikely(!len))
+ return;
offset &= chanb->buf_size - 1;
sbidx = offset >> chanb->subbuf_size_order;
index = (offset & (chanb->subbuf_size - 1)) >> PAGE_SHIFT;
struct lib_ring_buffer_backend_pages *rpages;
unsigned long sb_bindex, id;
+ if (unlikely(!len))
+ return;
offset &= chanb->buf_size - 1;
sbidx = offset >> chanb->subbuf_size_order;
index = (offset & (chanb->subbuf_size - 1)) >> PAGE_SHIFT;
unsigned long ret;
mm_segment_t old_fs = get_fs();
+ if (unlikely(!len))
+ return;
offset &= chanb->buf_size - 1;
sbidx = offset >> chanb->subbuf_size_order;
index = (offset & (chanb->subbuf_size - 1)) >> PAGE_SHIFT;