On Tue, Aug 22, 2017 at 8:02 PM, Logan Gunthorpe <log...@deltatee.com> wrote:
> This patch adds generic io{read|write}64[be]{_lo_hi|_hi_lo} macros if
> they are not already defined by the architecture. (As they are provided
> by the generic iomap library).
>
> The patch also points io{read|write}64[be] to the variant specified by the
> header name.
>
> This is because new drivers are encouraged to use ioreadXX, et al instead
> of readX[1], et al -- and mixing ioreadXX with readq is pretty ugly.
>
> [1] ldd3: section 9.4.2ldd -> LDD It's a pretty outdated book, though quite many chapters are actual for these days. Recomendation is kinda arguable. I doubt modern architectures make difference between IO operations and MMIO. Does, for example, PCI requires some special signal (message / wire) handling when pio_*() accessors used vs. mmio_*() ones? > cc: Christoph Hellwig <h...@lst.de> > cc: Arnd Bergmann <a...@arndb.de> > cc: Alan Cox <gno...@lxorguk.ukuu.org.uk> > cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> cc -> Cc ? -- With Best Regards, Andy Shevchenko
