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

[Christophe Leroy]

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 :)

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