/*
* This is called when relaxing access to a PTE. It's also called in the page
* fault path when we don't hit any of the major fault cases, ie, a minor
* update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have
* handled those two for us, we additionally deal with missing execute
* permission here on some processors
*/
int ptep_set_access_flags(struct vm_area_struct *vma, unsigned long address,
pte_t *ptep, pte_t entry, int dirty)
{
int changed;
if (!dirty && pte_need_exec_flush(entry, 0))
entry = do_dcache_icache_coherency(entry);
changed = !pte_same(*(ptep), entry);
if (changed) {
assert_pte_locked(vma->vm_mm, address);
__ptep_set_access_flags(ptep, entry);
flush_tlb_page_nohash(vma, address);
}
return changed;
}
/*
* set_pte stores a linux PTE into the linux page table.
*/
void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
{
#ifdef CONFIG_DEBUG_VM
WARN_ON(pte_present(*ptep));
#endif
/* Note: mm->context.id might not yet have been assigned as
* this context might not have been activated yet when this
* is called.
*/
pte = __pte(pte_val(pte) & ~_PAGE_HPTEFLAGS);
if (pte_need_exec_flush(pte, 1))
pte = do_dcache_icache_coherency(pte, addr);
/* Perform the setting of the PTE */
__set_pte_at(mm, addr, ptep, pte, 0);
}