[lwip-devel] [bug #48300] Private mempools allocate foreign memory

[Dirk Ziegelmeier]

Follow-up Comment #6, bug #48300 (project lwip):

Adding these bytes is a waste of memory. A better fix would be to enforce
alignment on these buffers. We would need PORTABLE alignment macros like for
packing...

Does anyone have a PORTABLE solution?

- gcc
- IAR
- MSVC
- ...

Maybe using a naturally aligned datatype would be a solution? e.g. declaring
the pool as u32_t. For your actual problem, you need to use uint64_t (AFAIK at
least ARM aligns it to 8 byte for FPU reasons).

#define LWIP_MEMPOOL_DECLARE(name,num,size,desc) LWIP_MEMPOOL_TYPE
memp_memory_ ## name ## _base \
[(((num) * (MEMP_SIZE + MEMP_ALIGN_SIZE(size)))) / sizeof(LWIP_MEMPOOL_TYPE)];
\ 

Could you please try it?

Others, any comments to this (a little bit hackerish) solution?



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