Esempi in C++ (Cpp) per page_ref_sub_and_test

Esempio n. 1

File: backport-4.10.c Progetto: hauke/backports

void __page_frag_cache_drain(struct page *page, unsigned int count)
{
	VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);

	if (page_ref_sub_and_test(page, count)) {
		unsigned int order = compound_order(page);

		/*
		 * __free_pages_ok() is not exported so call
		 * __free_pages() which decrements the ref counter
		 * and increment the ref counter before.
		 */
		page_ref_inc(page);
		__free_pages(page, order);
	}
}

Esempio n. 2

File: mmu_context_book3s64.c Progetto: andyprice/linux

static void destroy_pagetable_page(struct mm_struct *mm)
{
	int count;
	void *pte_frag;
	struct page *page;

	pte_frag = mm->context.pte_frag;
	if (!pte_frag)
		return;

	page = virt_to_page(pte_frag);
	/* drop all the pending references */
	count = ((unsigned long)pte_frag & ~PAGE_MASK) >> PTE_FRAG_SIZE_SHIFT;
	/* We allow PTE_FRAG_NR fragments from a PTE page */
	if (page_ref_sub_and_test(page, PTE_FRAG_NR - count)) {
		pgtable_page_dtor(page);
		free_unref_page(page);
	}
}