/*
* shmem_free_swp - free some swap entries in a directory
*
* @dir: pointer to the directory
* @edir: pointer after last entry of the directory
*/
static int shmem_free_swp(swp_entry_t *dir, swp_entry_t *edir)
{
swp_entry_t *ptr;
int freed = 0;
for (ptr = dir; ptr < edir; ptr++) {
if (ptr->val) {
free_swap_and_cache(*ptr);
*ptr = (swp_entry_t){0};
freed++;
}
}
return freed;
}
static inline int zap_pte_range(mmu_gather_t *tlb, pmd_t * pmd, unsigned long address, unsigned long size)
{
unsigned long offset;
pte_t * ptep;
int freed = 0;
if (pmd_none(*pmd))
return 0;
if (pmd_bad(*pmd)) {
pmd_ERROR(*pmd);
pmd_clear(pmd);
return 0;
}
ptep = pte_offset(pmd, address);
offset = address & ~PMD_MASK;
if (offset + size > PMD_SIZE)
size = PMD_SIZE - offset;
size &= PAGE_MASK;
for (offset=0; offset < size; ptep++, offset += PAGE_SIZE) {
pte_t pte = *ptep;
if (pte_none(pte))
continue;
if (pte_present(pte)) {
struct page *page = pte_page(pte);
if (VALID_PAGE(page) && !PageReserved(page))
freed ++;
/* This will eventually call __free_pte on the pte. */
tlb_remove_page(tlb, ptep, address + offset);
} else {
free_swap_and_cache(pte_to_swp_entry(pte));
pte_clear(ptep);
}
}
return freed;
}
