On Sat, Jan 27, 2018 at 1:55 AM, Andi Kleen <ak@xxxxxxxxxxxxxxx> wrote: > On Sat, Jan 27, 2018 at 01:15:49AM +0100, Arnd Bergmann wrote: >> On Mon, Nov 27, 2017 at 10:34 PM, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote: >> > From: Andi Kleen <ak@xxxxxxxxxxxxxxx> >> > - Add a new LDFINAL variable that controls the final link >> > for vmlinux or module. In this case we call gcc-ld instead >> > of ld, to run the LTO step. >> >> When I tried this out on allmodconfig (following the lwn article), I ran into >> a number of warnings: > > Thanks for testing. Yes it's a known issue: during one module build > when modpost looks at the file it is still in LTO format, and > modpost doesn't understand the LTO symbol table. I had a patch > to teach it to it at some point, but it got lost somewhere. > The LLVM LTO patchkit has a different solution that actually > fixes the sequence to run modpost only after a LTO final link, > but I haven't gotten around to port that one. > > It seems to work already for the single file modules. Ok, I see. I've turned off that warning now for testing. What about this one: kallsyms failure: relative symbol value 0xffffffff81000000 out of range in relative mode I seem to get that all the time here, and have also disabled it for now, but it sounds important (and breaks the build). Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html