On 2014-09-10 at 09:29:25 +0200, Chung-Lin Tang <chunglin_t...@mentor.com> wrote: > 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?
Please see Arnd's comment on the v2 of this patch [1] for a solution. [1] http://www.spinics.net/lists/linux-arch/msg27059.html -- 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/
