On Tue, Feb 11, 2020 at 5:57 AM James Morse [off-list ref] wrote:

I found I had to add:
| KBUILD_CFLAGS := $(filter-out -ffixed-x18 $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))

to drivers/firmware/efi/libstub/Makefile, to get this going.

Ah, good catch!

I don't think there is much point supporting SCS for the EFIstub, its already isolated
from the rest of the kernel's C code by the __efistub symbol prefix machinery, and trying
to use it would expose us to buggy firmware at a point we can't handle it!

Yes, fully agreed.

I can send a patch if its easier for you,

It's not a problem, I will include a patch for this in v8.

Sami

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