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Re: [Qemu-ppc] [Qemu-devel] [PATCH] ppc: virtex_ml507: QEMU_OPTION_dtb s

From: Alexander Graf
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] ppc: virtex_ml507: QEMU_OPTION_dtb support for this machine.
Date: Wed, 14 Aug 2013 12:38:15 +0200

On 14.08.2013, at 12:34, Felix Deichmann wrote:

> 2013/8/14 Alexander Graf <address@hidden>:
>>> -    void *fdt;
>>> +    void *fdt = 0;
>> This should be NULL. NULL doesn't have to be 0 according to C IIRC.
> The last statement is wrong here, NULL is always the same as 0
> language-wise. Although the above code is always correct, some will
> consider it better style to use NULL when dealing with pointer
> context.
> What you probably meant is that the *internal representation* of a
> null pointer is not guaranteed to be all-0-bits, in contrast to the
> conceptual null pointer constant (== 0) understood and taken care of
> by the compiler. But the internal representation is irrelevant here.
> http://c-faq.com/null/

Ah, very nice page explaining everything and more I ever wanted to know about 
NULL ;).


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