linux-kernel - Re: [RFC v3 24/24] m68k: Dispatch nvram

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Message-ID: <CAMuHMdX0c3BjhkSMv4fUe1WVWDHhqRMHz=K15750EBatwkJisQ@mail.gmail.com>
Date:	Mon, 29 Jun 2015 09:25:47 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Finn Thain <fthain@...egraphics.com.au>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Linux/m68k" <linux-m68k@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [RFC v3 24/24] m68k: Dispatch nvram_ops calls to Atari or Mac functions

Hi Finn,

> A multi-platform kernel binary needs to decide at run-time how to dispatch
> the arch_nvram_ops calls. Add platform-independent arch_nvram_ops, for use
> when multiple platform-specific NVRAM ops implementations are needed.
>
> Enable CONFIG_HAVE_ARCH_NVRAM_OPS for Macs.

Thanks for your patch!

On Sun, Jun 28, 2015 at 3:42 AM, Finn Thain <fthain@...egraphics.com.au> wrote:
> --- linux.orig/arch/m68k/kernel/setup_mm.c      2015-06-28 11:41:27.000000000 +1000
> +++ linux/arch/m68k/kernel/setup_mm.c   2015-06-28 11:41:56.000000000 +1000

> @@ -568,3 +569,109 @@ static int __init adb_probe_sync_enable
>
>  __setup("adb_sync", adb_probe_sync_enable);
>  #endif /* CONFIG_ADB */
> +
> +#if IS_ENABLED(CONFIG_NVRAM)
> +extern unsigned char mac_pram_read_byte(int);
> +extern void mac_pram_write_byte(unsigned char, int);
> +extern ssize_t mac_pram_get_size(void);
> +
> +extern ssize_t atari_nvram_read(char *, size_t, loff_t *);
> +extern ssize_t atari_nvram_write(char *, size_t, loff_t *);
> +extern long atari_nvram_set_checksum(void);
> +extern long atari_nvram_initialize(void);
> +extern ssize_t atari_nvram_get_size(void);

Forward declarations belong in a header file, to be included by both
producers and consumers.

> --- linux.orig/arch/m68k/Kconfig        2015-06-28 11:41:39.000000000 +1000
> +++ linux/arch/m68k/Kconfig     2015-06-28 11:41:56.000000000 +1000
> @@ -72,7 +72,7 @@ config PGTABLE_LEVELS
>         default 3
>
>  config HAVE_ARCH_NVRAM_OPS
> -       def_bool ATARI
> +       def_bool ATARI || MAC

For maintainability, it's better to just have "bool" here, and let both the
ATARI and MAC config symbols select HAVE_ARCH_NVRAM_OPS.

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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