On Fri, 2014-11-21 at 13:57 +0000, Mel Gorman wrote:
> void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
> pte_t pte)
> {
> -#ifdef CONFIG_DEBUG_VM
> - WARN_ON(pte_val(*ptep) & _PAGE_PRESENT);
> -#endif
> + /*
> + * When handling numa faults, we already have the pte marked
> + * _PAGE_PRESENT, but we can be sure that it is not in hpte.
> + * Hence we can use set_pte_at for them.
> + */
> + VM_WARN_ON((pte_val(*ptep) & (_PAGE_PRESENT | _PAGE_USER)) ==
> + (_PAGE_PRESENT | _PAGE_USER));
> +
His is that going to fare with set_pte_at() called for kernel pages ?
Cheers,
Ben.
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