On 14/9/10 5:25 AM, valdis.kletni...@vt.edu wrote: > On Mon, 08 Sep 2014 17:22:36 +0800, Ley Foon Tan said: >> This patch adds support for loadable modules. >> >> Signed-off-by: Ley Foon Tan <lf...@altera.com> > >> +/* >> + * Modules should NOT be allocated with kmalloc for (obvious) reasons. >> + * But we do it for now to avoid relocation issues. CALL26/PCREL26 cannot >> reach >> + * from 0x80000000 (vmalloc area) to 0xc00000000 (kernel) (kmalloc returns >> + * addresses in 0xc0000000) >> + */ > > That's a nice scary comment to see. :) > > What's the long-term plan here? >
We would probably need to add the ability to add trampolines in some way, though this of course impairs a little performance. Or if the default region of vmalloc can be configured to use the same 256MB region as the kernel. I wonder how MIPS (which has similar same-region call/jump instructions) deals with this? Chung-Lin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
