linux-kernel - Re: [PATCH 2/6] Add shared update

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Date:	Thu, 3 Oct 2013 10:52:24 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Roy Franz <roy.franz@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, matt.fleming@...el.com,
	linux@....linux.org.uk, leif.lindholm@...aro.org,
	grant.likely@...aro.org, dave.martin@....com, msalter@...hat.com
Subject: Re: [PATCH 2/6] Add shared update_fdt() function for ARM/ARM64

On Sat, 28 Sep, at 09:23:19AM, Roy Franz wrote:
> Both ARM and ARM64 stubs will update the device tree
> that they pass to the kernel.  In both cases they
> primarily need to add the same UEFI related information,
> so the function can be shared.
> 
> Signed-off-by: Roy Franz <roy.franz@...aro.org>
> ---
>  drivers/firmware/efi/efi-stub-helper.c |   86 ++++++++++++++++++++++++++++++++
>  1 file changed, 86 insertions(+)
> 
> diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c
> index cc0581d..d3448a9 100644
> --- a/drivers/firmware/efi/efi-stub-helper.c
> +++ b/drivers/firmware/efi/efi-stub-helper.c
> @@ -4,6 +4,7 @@
>   * implementation files.
>   *
>   * Copyright 2011 Intel Corporation; author Matt Fleming
> + * Copyright 2013 Linaro Limited; author Roy Franz
>   *
>   * This file is part of the Linux kernel, and is made available
>   * under the terms of the GNU General Public License version 2.
> @@ -636,3 +637,88 @@ static char *efi_convert_cmdline_to_ascii(efi_system_table_t *sys_table_arg,
>  	*cmd_line_len = options_size;
>  	return (char *)cmdline_addr;
>  }
> +
> +#if defined(CONFIG_ARM) || defined(CONFIG_ARM64)
> +static efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
> +			       void *fdt, int new_fdt_size, char *cmdline_ptr,
> +			       u64 initrd_addr, u64 initrd_size,
> +			       efi_memory_desc_t *memory_map,
> +			       unsigned long map_size, unsigned long desc_size,
> +			       u32 desc_ver)

Hmm... does this function really belong in efi-stub-helper.c? That file
should be for architecture independent functionality only.

While it currently does include this little snippet,

#ifdef CONFIG_ARM
	/*
	 * For ARM, allocate at a high address to avoid reserved
	 * regions at low addresses that we don't know the specfics of
	 * at the time we are processing the command line.
	 */
	status = efi_high_alloc(sys_table_arg, options_size, 0,
			    &cmdline_addr, 0xfffff000);
#else
	status = efi_low_alloc(sys_table_arg, options_size, 0,
			    &cmdline_addr);
#endif

I think that single #ifdef is justifiable. But including entire
functions that are only used by ARM/ARM64 or x86 isn't.

-- 
Matt Fleming, Intel Open Source Technology Center
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