On Thu, Jul 25, 2024 at 02:28:27AM +0800, Hailong.Liu wrote:
> > if (!IS_ENABLED(CONFIG_HAVE_ARCH_HUGE_VMALLOC) ||
> > - page_shift == PAGE_SHIFT)
> > - return vmap_small_pages_range_noflush(addr, end, prot, pages);
> > + page_shift == PAGE_SHIFT ||
> > + page_private(pages[0]) == VM_AREA_ALLOC_PAGES_FALLBACK) {
> > + int ret = vmap_small_pages_range_noflush(addr, end, prot, pages);
> > +
> > + set_page_private(pages[0], 0);
> > + return ret;
> > + }
> >
> > for (i = 0; i < nr; i += 1U << (page_shift - PAGE_SHIFT)) {
> > int err;
> > @@ -3583,6 +3590,7 @@ vm_area_alloc_pages(gfp_t gfp, int nid,
> >
> > /* fall back to the zero order allocations */
> > alloc_gfp |= __GFP_NOFAIL;
> > + fallback = true;
> Sry for my mistake, I forget define fallback here.
> BTW, This is not the optimal solution. Does anyone have a better idea? Glad to
> hear:)
Yeah, I really don't like this approach. You could return a small
struct indicating both nr_allocated and whether you had to fall back.
Or you could pass a bool * parameter. They're both pretty nasty.
