[PATCH] powerpc/8xx: Load modules closer to kernel text

Christophe Leroy christophe.leroy at csgroup.eu
Thu Apr 1 01:12:06 AEDT 2021



Le 31/03/2021 à 15:39, Michael Ellerman a écrit :
> Christophe Leroy <christophe.leroy at csgroup.eu> writes:
>> On the 8xx, TASK_SIZE is 0x80000000. The space between TASK_SIZE and
>> PAGE_OFFSET is not used.
>>
>> Use it to load modules in order to minimise the distance between
>> kernel text and modules and avoid trampolines in modules to access
>> kernel functions or other module functions.
>>
>> Define a 16Mbytes area for modules, that's more than enough.
> 
> 16MB seems kind of small.
> 
> At least on 64-bit we could potentially have hundreds of MBs of modules.
> 

Well, with a 16 MB kernel and 16 MB modules, my board is full :)

Even on the more recent board that has 128 MB, I don't expect more than a few MBs of modules in 
addition to the kernel which is approx 8M.


But ok, I'll do something more generic, though it will conflict with Jordan's series.

Christophe


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