On Thu, Mar 16, 2017 at 03:46:51PM -0500, Bjorn Helgaas wrote: > On Thu, Jul 9, 2015 at 7:28 PM, Luis R. Rodriguez > <mcgrof@xxxxxxxxxxxxxxxx> wrote: > > > +/** > > + * DOC: ioremap() and ioremap_*() variants > > + * > > + * If you have an IOMMU your architecture is expected to have both ioremap() > > + * and iounmap() implemented otherwise the asm-generic helpers will provide a > > + * direct mapping. > > + * > > + * There are ioremap_*() call variants, if you have no IOMMU we naturally will > > + * default to direct mapping for all of them, you can override these defaults. > > + * If you have an IOMMU you are highly encouraged to provide your own > > + * ioremap variant implementation as there currently is no safe architecture > > + * agnostic default. To avoid possible improper behaviour default asm-generic > > + * ioremap_*() variants all return NULL when an IOMMU is available. If you've > > + * defined your own ioremap_*() variant you must then declare your own > > + * ioremap_*() variant as defined to itself to avoid the default NULL return. > > Are the references above to "IOMMU" typos? Should they say "MMU" > instead, so they match the #ifdef below? Yes. Patch welcomed. Luis -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
