[PATCH] malloc: Remove dumped heap support

[Adhemerval Zanella Netto]

On 30/07/25 06:33, Wilco Dijkstra wrote:
> Hi Florian,
> 
>>> Remove support for obsolete dumped heaps.  Dumping heaps was discontinued
>>> 8 years ago, however loading a dumped heap is still supported. This blocks
>>> changes and improvements of the malloc data structures - hence it is time
>>> to remove this.  Ancient binaries that still call malloc_set_state will now
>>> get the -1 error code.  Update tst-mallocstate.c to just check for this.
>>
>> What are the improvements blocked by the heap rewriting?
> 
> Basically anything that changes the block layout and bit allocation in memory
> is blocked by it. Even my minor change to mmap [1] was problematic since it
> marks dumped heap blocks as mmaps and reuses the various mmap calls.
> 
> There is also a fundamental issue with the structure of the code - including
> malloc.c repeatedly to be used in different contexts is a terrible design.
> Getting rid of anything we don't strictly need that relies on malloc internals
> makes it easier to improve malloc.
> 
> Cheers,
> Wilco
> 
> [1] https://sourceware.org/pipermail/libc-alpha/2025-July/169025.html

So I take that there is no blocker for this change, I need it only requires
a NEWS entry on 'Deprecated and removed features'.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>