linux-kernel - Re: [PATCH v2 08/20] x86, ACPI: Find acpi tables in initrd early from head

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Date:	Sun, 10 Mar 2013 12:25:12 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Thomas Renninger <trenn@...e.de>,
	Tang Chen <tangchen@...fujitsu.com>,
	linux-kernel@...r.kernel.org, Jacob Shin <jacob.shin@....com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 08/20] x86, ACPI: Find acpi tables in initrd early from head_32.S/head64.c

On Sun, Mar 10, 2013 at 8:44 AM, Yinghai Lu <yinghai@...nel.org> wrote:
> +void __init x86_acpi_override_find(void)
> +{
> +       unsigned long ramdisk_image, ramdisk_size;
> +       unsigned char *p = NULL;
> +
> +#ifdef CONFIG_X86_32
> +       struct boot_params *boot_params_p;
> +
> +       /*
> +        * 32bit is from head_32.S, and it is 32bit flat mode.
> +        * So need to use phys address to access global variables.
> +        */
> +       boot_params_p = (struct boot_params *)__pa_symbol(&boot_params);
> +       ramdisk_image = get_ramdisk_image(boot_params_p);
> +       ramdisk_size  = get_ramdisk_size(boot_params_p);
> +       p = (unsigned char *)ramdisk_image;
> +       acpi_initrd_override_find(p, ramdisk_size, true);
> +#else
> +       ramdisk_image = get_ramdisk_image(&boot_params);
> +       ramdisk_size  = get_ramdisk_size(&boot_params);
> +       if (ramdisk_image)
> +               p = __va(ramdisk_image);
> +       acpi_initrd_override_find(p, ramdisk_size, false);
> +#endif
> +}
> +#endif

What is preventing us from making the 64-bit variant also work in flat
mode to make the code consistent and not hiding the differences under
the rug? What am I missing here?

                        Pekka
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