linux-kernel - Re: [PATCH v6 06/16] h8300: CPU depend helpers

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Message-ID: <CAMuHMdVYC5pxzZssGo2EuytD6hbimDCQ+4COUGD==Tp_tH1zcA@mail.gmail.com>
Date:	Mon, 9 Mar 2015 18:55:03 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux-Arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v6 06/16] h8300: CPU depend helpers

On Mon, Mar 9, 2015 at 5:21 PM, Joe Perches <joe@...ches.com> wrote:
>>  arch/h8300/kernel/cpu/h83069/setup.c   | 202 ++++++++++++++++++++++++++
> []
>> diff --git a/arch/h8300/kernel/cpu/h83069/setup.c b/arch/h8300/kernel/cpu/h83069/setup.c
> []
>> +static struct resource sci0_resources[] = {
>> +     DEFINE_RES_MEM(0xffffb0, 8),
>> +     DEFINE_RES_IRQ(52),
>> +     DEFINE_RES_IRQ(53),
>> +     DEFINE_RES_IRQ(54),
>> +     DEFINE_RES_IRQ(55),
>> +}
>
> Perhaps most all of these might be const?
>
>> +static struct plat_sci_port sci0_platform_data = {
> []
>> +static struct resource sci1_resources[] = {
> []
>> +static struct plat_sci_port sci1_platform_data = {
> []
>> +static struct platform_device sci0_device = {
> []
>> +static struct platform_device sci1_device = {
> []
>> +static struct h8300_timer8_config tm8_unit0_platform_data = {
> []
>> +static struct resource tm8_unit0_resources[] = {
> []
>> +static struct platform_device timer8_unit0_device = {
> []
>> +static struct h8300_timer8_config tm8_unit1_platform_data = {
> []

Unfortunately not. device.platform_data and platform_device.resource are
not const pointers.

They can only be const (and __initdata) when the platform devices are
created using platform_device_register_resndata(), as that one copies the
data.

May still be a good idea to use that instead of static platform devices, though,
especially for multi-platform kernels (because the __initdata data is reclaimed
later).

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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