[U-Boot] [PATCH v8] [RFC] early_malloc for DM added.

Graeme Russ graeme.russ at gmail.com
Tue Sep 25 02:37:08 CEST 2012

Hi Marek,

On Tue, Sep 25, 2012 at 12:19 AM, Marek Vasut <marex at denx.de> wrote:
> Dear Tomas Hlavacek,
> [...]
>> >> +static inline void *dmrealloc(void *oldmem, size_t bytes)
>> >> +{
>> >> +     if (early_malloc_active())
>> >> +             return NULL;
>> >
>> > I wonder how should this be implemented ... maybe early_malloc + standard
>> > memcpy()
>> How do you want me to fix all the pointers to the memcpyied part of
>> heap then? I think this will not work unless I make some reservations
>> for eventual growth for each and every early_mallocated area. And I
>> think this is not good idea at all for early_malloc.
> What exactly would you need to fix ? It's only a matter of allocating new block,
> copying the existing data there and returning the pointer to the new block, no?
>> I think there are two straight-forward possibilities: a) keep the
>> empty implementation of dmrealloc() in early stage and avoid using it
>> in code which might run in early stage, but retain the dm* version of
>> the symbol. b) remove the dmrealloc() entirely which may have certain
>> negative consequences, because it might be tempting to mix dmmalloc()
>> and (non-dm*) realloc() calls which is obviously wrong.

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