On Wed, Dec 05, 2018 at 08:39:29AM +0530, Aneesh Kumar K.V wrote:
> +pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr,
> + pte_t *ptep)
> +{
> + unsigned long pte_val;
> +
> + /*
> + * Clear the _PAGE_PRESENT so that no hardware parallel update is
> + * possible. Also keep the pte_present true so that we don't take
> + * wrong fault.
> + */
> + pte_val = pte_update(vma->vm_mm, addr, ptep, _PAGE_PRESENT, _PAGE_INVALID, 0);
> +
> + return __pte(pte_val);
> +
> +}
> +EXPORT_SYMBOL(ptep_modify_prot_start);
As far as I can tell this is only called from mm/memory.c, mm/mprotect.c
and fs/proc/task_mmu.c, so there should be no need to export the
function.
