参照元†
- struct page *page
- void *virtual
返り値†
#if defined(WANT_PAGE_VIRTUAL)
(略)
#define set_page_address(page, address) \
do { \
(page)->virtual = (address); \
} while(0)
(略)
#endif
/**
* set_page_address - set a page's virtual address
* @page: &struct page to set
* @virtual: virtual address to use
*/
void set_page_address(struct page *page, void *virtual)
{
unsigned long flags;
struct page_address_slot *pas;
struct page_address_map *pam;
BUG_ON(!PageHighMem(page));
pas = page_slot(page);
if (virtual) { /* Add */
BUG_ON(list_empty(&page_address_pool));
spin_lock_irqsave(&pool_lock, flags);
pam = list_entry(page_address_pool.next,
struct page_address_map, list);
list_del(&pam->list);
spin_unlock_irqrestore(&pool_lock, flags);
pam->page = page;
pam->virtual = virtual;
spin_lock_irqsave(&pas->lock, flags);
list_add_tail(&pam->list, &pas->lh);
spin_unlock_irqrestore(&pas->lock, flags);
} else { /* Remove */
spin_lock_irqsave(&pas->lock, flags);
list_for_each_entry(pam, &pas->lh, list) {
if (pam->page == page) {
list_del(&pam->list);
spin_unlock_irqrestore(&pas->lock, flags);
spin_lock_irqsave(&pool_lock, flags);
list_add_tail(&pam->list, &page_address_pool);
spin_unlock_irqrestore(&pool_lock, flags);
goto done;
}
}
spin_unlock_irqrestore(&pas->lock, flags);
}
done:
return;
}
#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL)
(略)
#define set_page_address(page, address) do { } while(0)
(略)
#endif
コメント†