On Thu, May 25, 2023 at 08:31:14AM +0530, Anshuman Khandual wrote:
> > +#ifndef set_ptes
> > +#ifdef PFN_PTE_SHIFT
> > +/**
> > + * set_ptes - Map consecutive pages to a contiguous range of addresses.
> > + * @mm: Address space to map the pages into.
> > + * @addr: Address to map the first page at.
> > + * @ptep: Page table pointer for the first entry.
> > + * @pte: Page table entry for the first page.
> > + * @nr: Number of pages to map.
> > + *
> > + * May be overridden by the architecture, or the architecture can define
> > + * set_pte() and PFN_PTE_SHIFT.
> > + *
> > + * Context: The caller holds the page table lock. The pages all belong
> > + * to the same folio. The PTEs are all in the same PMD.
> > + */
> > +static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
> > + pte_t *ptep, pte_t pte, unsigned int nr)
> > +{
> > + page_table_check_ptes_set(mm, addr, ptep, pte, nr);
> > +
> > + for (;;) {
> > + set_pte(ptep, pte);
> > + if (--nr == 0)
> > + break;
> > + ptep++;
> > + pte = __pte(pte_val(pte) + (1UL << PFN_PTE_SHIFT));
> > + }
> > +}
> > +#ifndef set_pte_at
> > +#define set_pte_at(mm, addr, ptep, pte) set_ptes(mm, addr, ptep, pte, 1)
> > +#endif
>
> Should not there be a build phase call out when both set_ptes() and PFN_PTE_SHIFT
> are not defined on a given platform ?
How does that help? Either way you get a clear build error.
