Christophe Leroy <christophe.le...@c-s.fr> writes: > diff --git a/arch/powerpc/mm/ioremap.c b/arch/powerpc/mm/ioremap.c > index 57d742509cec..889ee656cf64 100644 > --- a/arch/powerpc/mm/ioremap.c > +++ b/arch/powerpc/mm/ioremap.c > @@ -103,3 +103,46 @@ void iounmap(volatile void __iomem *token) > vunmap(addr); > } > EXPORT_SYMBOL(iounmap); > + > +#ifdef CONFIG_PPC64 > +/** > + * __ioremap_at - Low level function to establish the page tables > + * for an IO mapping > + */ > +void __iomem *__ioremap_at(phys_addr_t pa, void *ea, unsigned long size, > pgprot_t prot) > +{ > + /* We don't support the 4K PFN hack with ioremap */ > + if (pgprot_val(prot) & H_PAGE_4K_PFN) > + return NULL; > + > + if ((ea + size) >= (void *)IOREMAP_END) { > + pr_warn("Outside the supported range\n"); > + return NULL; > + } > + > + WARN_ON(pa & ~PAGE_MASK); > + WARN_ON(((unsigned long)ea) & ~PAGE_MASK); > + WARN_ON(size & ~PAGE_MASK); > + > + if (ioremap_range((unsigned long)ea, pa, size, prot, NUMA_NO_NODE))
This doesn't build. Adding ... extern int ioremap_range(unsigned long ea, phys_addr_t pa, unsigned long size, pgprot_t prot, int nid); ... above, until the next patch, fixes it. cheers