how to return a chunk of kernel .data to free mem ?

how to return a chunk of kernel .data to free mem ?

[jim.cromie]

I have convinced DYNAMIC_DEBUG code to not need
about 15% of its __dyndbg section, about 30kb on my test kernel.

This memory is not kmalloc'd, so krealloc wont work.
(I tried anyway, on a loaded module, it panicd)

Is there a way to return a chunk of init .data memory to general use ?

heres the patchset;
https://lore.kernel.org/lkml/20210529200029.205306-1-jim.cromie@gmail.com/

how to return a chunk of kernel .data to free mem ?

[jim.cromie]

I have convinced DYNAMIC_DEBUG code to not need
about 15% of its __dyndbg section, about 30kb on my test kernel.

This memory is not kmalloc'd, so krealloc wont work.
(I tried anyway, on a loaded module, it panicd)

Is there a way to return a chunk of init .data memory to general use ?

heres the patchset;
https://lore.kernel.org/lkml/20210529200029.205306-1-jim.cromie@gmail.com/

Re: how to return a chunk of kernel .data to free mem ?

[David Hildenbrand]

On 05.06.21 16:50, jim.cromie@gmail.com wrote:
> I have convinced DYNAMIC_DEBUG code to not need
> about 15% of its __dyndbg section, about 30kb on my test kernel.
> 
> This memory is not kmalloc'd, so krealloc wont work.
> (I tried anyway, on a loaded module, it panicd)
> 
> Is there a way to return a chunk of init .data memory to general use ?
> 
> heres the patchset;
> https://lore.kernel.org/lkml/20210529200029.205306-1-jim.cromie@gmail.com/
> 

Hm, you could try free_reserved_page(). But obviously, only full pages 
can be handed to the buddy.

-- 
Thanks,

David / dhildenb