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

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Date:   Wed, 21 Aug 2019 10:42:27 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Christoph Hellwig <hch@....de>,
        Christophe Leroy <christophe.leroy@....fr>
Cc:     Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, npiggin@...il.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 05/12] powerpc/mm: rework io-workaround invocation.

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.