Am Mittwoch, 5. Juni 2019, 20:42:32 CEST schrieb Ard Biesheuvel:
> On Wed, 5 Jun 2019 at 18:26, Greg KH <gregkh@linuxfoundation.org> wrote:
> > On Wed, Jun 05, 2019 at 05:19:40PM +0200, Rolf Eike Beer wrote:
> > > I decided to dig out a toy project which uses a DragonBoard 410c. This
> > > has
> > > been "running" with kernel 4.9, which I would keep this way for
> > > unrelated
> > > reasons. The vanilla 4.9 kernel wasn't bootable back then, but it was
> > > buildable, which was good enough.
> > > 
> > > Upgrading the kernel to 4.9.180 caused the boot to suddenly fail:
> > > 
> > > aarch64-unknown-linux-gnueabi-ld:
> > > ./drivers/firmware/efi/libstub/lib.a(arm64- stub.stub.o): in function
> > > `handle_kernel_image':
> > > /tmp/e2/build/linux-4.9.139/drivers/firmware/efi/libstub/arm64-stub.c:63
> > > :
> > > undefined reference to `__efistub__GLOBAL_OFFSET_TABLE_'
> > > aarch64-unknown-linux-gnueabi-ld:
> > > ./drivers/firmware/efi/libstub/lib.a(arm64- stub.stub.o): relocation
> > > R_AARCH64_ADR_PREL_PG_HI21 against symbol
> > > `__efistub__GLOBAL_OFFSET_TABLE_' which may bind externally can not be
> > > used when making a shared object; recompile with -fPIC
> > > /tmp/e2/build/linux-4.9.139/drivers/firmware/efi/libstub/arm64-stub.c:63
> > > :
> > > (.init.text+0xc): dangerous relocation: unsupported relocation
> > > /tmp/e2/build/linux-4.9.139/Makefile:1001: recipe for target 'vmlinux'
> > > failed -make[1]: *** [vmlinux] Error 1
> > > 
> > > This is caused by commit 27b5ebf61818749b3568354c64a8ec2d9cd5ecca from
> > > linux-4.9.y (which is 91ee5b21ee026c49e4e7483de69b55b8b47042be),
> > > reverting
> > > this commit fixes the build.
> > > 
> > > This happens with vanilla binutils 2.32 and gcc 8.3.0 as well as 9.1.0.
> > > See
> > > the attached .config for reference.

> It would be helpful to get a relocation dump (objdump -r) of
> arm64-stub.o to figure out which symbol needs a 'hidden' annotation to
> prevent GCC from emitting it as a PIC reference requiring a GOT.
> Alternatively, we can just revert this patch from 4.9

See attached file. This is with a few patches cherry-picked from upstream, 
none of them did help. Hope that doesn't make anything worse, at least the 
error message looks the same.

Eike
-- 
Rolf Eike Beer, emlix GmbH, http://www.emlix.com
Fon +49 551 30664-0, Fax +49 551 30664-11
Gothaer Platz 3, 37083 Göttingen, Germany
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