linux-kernel - Re: [PATCH] x86/devicetree: add missing early_init_dt_setup_initrd

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Date:	Mon, 6 Jun 2011 02:21:31 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Florian Fainelli <ffainelli@...ebox.fr>
Cc:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>,
	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, Maxime Bizon <mbizon@...ebox.fr>
Subject: Re: [PATCH] x86/devicetree: add missing
 early_init_dt_setup_initrd_arch stub

On Mon, Jun 06, 2011 at 10:15:49AM +0200, Florian Fainelli wrote:
> From: Florian Fainelli <ffainelli@...ebox.fr>
> 
> This patch fixes the following build failure:
> 
> drivers/built-in.o: In function `early_init_dt_check_for_initrd':
> /home/florian/dev/kernel/x86/linux-2.6-x86/drivers/of/fdt.c:571:
> undefined reference to `early_init_dt_setup_initrd_arch'
> make: *** [.tmp_vmlinux1] Error 1
> 
> which happens as soon as we enable initrd support on a x86 devicetree
> platform such as Intel CE4100.
> 
> Tested on a custom Intel CE4100 board.
> 
> CC:stable@...nel.org
> Signed-off-by: Florian Fainelli <ffainelli@...ebox.fr>

Acked-by: Grant Likely <grant.likely@...retlab.ca>

> ---
> Grant,
> 
> MIPS, PowerPC, Microblaze and now x86 all have the same way of implementing
> this, would it rather make sense to get this merged to generic devicetree functions
> and let this be overriden if needed?

Probably, but I'm not going to tackle that problem just yet.  Although
if you want to investigate and propose a patch, then go for it.  :-)

g.


> 
> Stable: this is a candidate for 2.6.39.2
> 
> diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
> index 690bc84..9aeb78a 100644
> --- a/arch/x86/kernel/devicetree.c
> +++ b/arch/x86/kernel/devicetree.c
> @@ -13,6 +13,7 @@
>  #include <linux/slab.h>
>  #include <linux/pci.h>
>  #include <linux/of_pci.h>
> +#include <linux/initrd.h>
>  
>  #include <asm/hpet.h>
>  #include <asm/irq_controller.h>
> @@ -98,6 +99,16 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
>  	return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
>  }
>  
> +#ifdef CONFIG_BLK_DEV_INITRD
> +void __init early_init_dt_setup_initrd_arch(unsigned long start,
> +					    unsigned long end)
> +{
> +	initrd_start = (unsigned long)__va(start);
> +	initrd_end = (unsigned long)__va(end);
> +	initrd_below_start_ok = 1;
> +}
> +#endif
> +
>  void __init add_dtb(u64 data)
>  {
>  	initial_dtb = data + offsetof(struct setup_data, data);
> -- 
> 1.7.4.1
> 
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