linux-kernel - Re: [PATCH] powerpc: make irq_chip const, __initdata and _

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Date:   Wed, 20 Sep 2017 08:34:00 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Michael Ellerman <mpe@...erman.id.au>
cc:     Bhumika Goyal <bhumirks@...il.com>, benh@...nel.crashing.org,
        paulus@...ba.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc: make irq_chip const, __initdata and
 __initconst



On Wed, 20 Sep 2017, Michael Ellerman wrote:

> Bhumika Goyal <bhumirks@...il.com> writes:
>
> > Make ehv_pic_irq_chip, mpic_ipi_chip and mpic_tm_chip const as they are
> > used only as a copy operation. This usage is during init, so make them
> > __initconst too.
> > Make mpic_ipi_chip __initdata as it is only modified during the init
> > phase and there is no reference of it anywhere after init.
>
> The change log doesn't seem to match the code.
>
> It's mpic_tm_chip which you marked __initdata, and that looks wrong, as
> we keep a pointer to it here:
>
> 	mpic->hc_tm = mpic_tm_chip;

This looks like a memory copy.

julia