[PATCH v2 05/12] powerpc/mm: rework io-workaround invocation.

[Benjamin Herrenschmidt]

On Wed, 2019-08-21 at 00:28 +0200, Christoph Hellwig wrote:
> On Tue, Aug 20, 2019 at 02:07:13PM +0000, Christophe Leroy wrote:
> > ppc_md.ioremap() is only used for I/O workaround on CELL platform,
> > so indirect function call can be avoided.
> > 
> > This patch reworks the io-workaround and ioremap() functions to
> > use the global 'io_workaround_inited' flag for the activation
> > of io-workaround.
> > 
> > When CONFIG_PPC_IO_WORKAROUNDS or CONFIG_PPC_INDIRECT_MMIO are not
> > selected, the I/O workaround ioremap() voids and the global flag is
> > not used.
> 
> Note that CONFIG_PPC_IO_WORKAROUNDS is only selected by a specific cell
> config,  and CONFIG_PPC_INDIRECT_MMIO is always selected by cell, so
> I think we can make CONFIG_PPC_IO_WORKAROUNDS depend on
> CONFIG_PPC_INDIRECT_MMIO

Or we can deprecate that old platform... not sure anybody uses it
anymore (if anybody ever did).

Cheers,
ben.