> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +extern struct page *alloc_transhugepage(struct vm_area_struct *vma,
> + unsigned long addr);
No need for the extern. And also here: do we actually need the stub,
or can the caller make sure (using IS_ENABLED and similar) that the
compiler knows the code is dead?
> +struct page *alloc_transhugepage(struct vm_area_struct *vma,
> + unsigned long haddr)
> +{
> + gfp_t gfp;
> + struct page *page;
> +
> + gfp = alloc_hugepage_direct_gfpmask(vma);
> + page = alloc_hugepage_vma(gfp, vma, haddr, HPAGE_PMD_ORDER);
> + if (page)
> + prep_transhuge_page(page);
> + return page;
I think do_huge_pmd_anonymous_page should be switched to use this
helper as well.
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