linux-kernel - Re: [PATCH v5 3/6] powerpc/mm/slice: Enhance for supporting PPC32

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Date:   Sat, 24 Feb 2018 17:47:44 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Scott Wood <oss@...error.net>, aneesh.kumar@...ux.vnet.ibm.com,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v5 3/6] powerpc/mm/slice: Enhance for supporting PPC32

On Thu, 22 Feb 2018 15:27:24 +0100 (CET)
Christophe Leroy <christophe.leroy@....fr> wrote:

> In preparation for the following patch which will fix an issue on
> the 8xx by re-using the 'slices', this patch enhances the
> 'slices' implementation to support 32 bits CPUs.
> 
> On PPC32, the address space is limited to 4Gbytes, hence only the low
> slices will be used.
> 
> The high slices use bitmaps. As bitmap functions are not prepared to
> handle bitmaps of size 0, this patch ensures that bitmap functions
> are called only when SLICE_NUM_HIGH is not nul.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

This looks good to me, thank you for taking my feedback into account.

Is the patch split and naming good? Yes I guess so, this adds support
for ppc32 archs that select PPC_MM_SLICES, and the next one implements
it for 8xx. There looks to be some generic arch/powerpc/mm bits in the
next patch. I wonder if you would move them over? Then the next patch
could be called powerpc/8xx: ?

Anyway it's not a big deal.

Reviewed-by: Nicholas Piggin <npiggin@...il.com>