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

[Michael Ellerman]

Christophe Leroy <christophe.leroy@xxxxxxxxxx> writes:
> Le 31/03/2021 à 15:39, Michael Ellerman a écrit :
>> Christophe Leroy <christophe.leroy@xxxxxxxxxx> 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 :)

Heh.

> 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.

Don't feel you have to. You're the expert on 8xx, not me.

cheers