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Re: [PATCH] of: Specify initrd location using 64-bit

To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>, <robherring2@gmail.com>
Subject: Re: [PATCH] of: Specify initrd location using 64-bit
From: Santosh Shilimkar <santosh.shilimkar@ti.com>
Date: Fri, 21 Jun 2013 13:20:26 -0400
Cc: <linux-kernel@vger.kernel.org>, Vineet Gupta <vgupta@synopsys.com>, Russell King <linux@arm.linux.org.uk>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Mark Salter <msalter@redhat.com>, Aurelien Jacquiot <a-jacquiot@ti.com>, James Hogan <james.hogan@imgtec.com>, Michal Simek <monstr@monstr.eu>, Ralf Baechle <ralf@linux-mips.org>, Jonas Bonn <jonas@southpole.se>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Paul Mackerras <paulus@samba.org>, <x86@kernel.org>, <arm@kernel.org>, Chris Zankel <chris@zankel.net>, Max Filippov <jcmvbkbc@gmail.com>, Grant Likely <grant.likely@linaro.org>, Rob Herring <rob.herring@calxeda.com>, Nicolas Pitre <nicolas.pitre@linaro.org>, <linux-arm-kernel@lists.infradead.org>, <linux-c6x-dev@linux-c6x.org>, <linux-mips@linux-mips.org>, <linuxppc-dev@lists.ozlabs.org>, <linux-xtensa@linux-xtensa.org>, <devicetree-discuss@lists.ozlabs.org>
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On Friday 21 June 2013 05:04 AM, Sebastian Andrzej Siewior wrote:
> On 06/21/2013 02:52 AM, Santosh Shilimkar wrote:
>> diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
>> index 0a2c68f..62e2e8f 100644
>> --- a/arch/microblaze/kernel/prom.c
>> +++ b/arch/microblaze/kernel/prom.c
>> @@ -136,8 +136,7 @@ void __init early_init_devtree(void *params)
>>  }
>>  
>>  #ifdef CONFIG_BLK_DEV_INITRD
>> -void __init early_init_dt_setup_initrd_arch(unsigned long start,
>> -            unsigned long end)
>> +void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
>>  {
>>      initrd_start = (unsigned long)__va(start);
>>      initrd_end = (unsigned long)__va(end);
> 
> I think it would better to go here for phys_addr_t instead of u64. This
> would force you in of_flat_dt_match() to check if the value passed from
> DT specifies a memory address outside of 32bit address space and the
> kernel can't deal with this because its phys_addr_t is 32bit only due
> to a Kconfig switch.
> 
> For x86, the initrd has to remain in the 32bit address space so passing
> the initrd in the upper range would violate the ABI. Not sure if this
> is true for other archs as well (ARM obviously not).
> 
That pretty much means phys_addr_t. It will work for me as well but
in last thread from consistency with memory and reserved node, Rob
insisted to keep it as u64. So before I re-spin another version,
would like to here what Rob has to say considering the x86 requirement.

Rob,
Are you ok with phys_addr_t since your concern was about rest
of the memory specific bits of the device-tree code use u64 ?

Regards,
Santosh


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