[Bug target/81863] [7 regression] -mword-relocations is unreliable

["ard.biesheuvel at linaro dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81863

--- Comment #19 from ard.biesheuvel at linaro dot org ---
(In reply to Ramana Radhakrishnan from comment #17)
> 
> Could you put some instructions in this BZ about how you build and test the
> kernel to get these errors ? I'm happy to try something before I post the
> patch rather than going backwards and forwards.

Please use the following branch

https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/log/?h=arm-kaslr-word-relocs

and build the multi_v7_defconfig target

export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabihf-

make multi_v7_defconfig
make zImage

(Sidenote: in this case, we apply -mword-relocations to modules as well, which
is not really necessary given that Linux kernel modules are simply partially
linked objects, and the exposed static relocations are handled by the modules
loader, including R_ARM_THM_MOVT_ABS/R_ARM_THM_MOVW_ABS_NC.)