# \[PATCH v3 08/28\] efi/libstub: Drop .discard.addressable from the stub objects - From: Josh Poimboeuf \ - Date: 2026-09-21 22:31:41 - List: rust-for-linux - Page: https://ratatoskr.run/rust-for-linux/2026/09/17618173 - Thread: https://ratatoskr.run/rust-for-linux/2026/09/17618165/t.md ```text On arm64, riscv and loongarch, the EFI stub objects are objcopy'd with --prefix-alloc-sections=.init, which renames every allocatable section. The .discard.addressable section is allocatable, so if STACK_FRAME_NON_STANDARD() and __ADDRESSABLE() are used, the section gets renamed and never discarded: ld: warning: orphan section `.init.discard.addressable' from `vmlinux.o' being placed in section `.init.discard.addressable' The section is also a problem for the stub's absolute relocation check on some arches. In preparation for using STACK_FRAME_NON_STANDARD() in libstub code, remove the section for both cases. Signed-off-by: Josh Poimboeuf --- drivers/firmware/efi/libstub/Makefile | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index 77a2b2d74f3f6..0d5d99c3cacdd 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -155,6 +155,11 @@ STUBCOPY_FLAGS-$(CONFIG_LOONGARCH) += --prefix-alloc-sections=.init \ --prefix-symbols=__efistub_ STUBCOPY_RELOC-$(CONFIG_LOONGARCH) := R_LARCH_MARK_LA +# Drop the section created by __ADDRESSABLE() from the absolute symbol check +# and the objcopy, otherwise it gets prefixed and doesn't get discared. +STUBCOPY_RM_SECTIONS := --remove-section=.discard.addressable +STUBCOPY_FLAGS-y += $(STUBCOPY_RM_SECTIONS) + $(obj)/%.stub.o: $(obj)/%.o FORCE $(call if_changed,stubcopy) @@ -166,7 +171,7 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE # quiet_cmd_stubcopy = STUBCPY $@ cmd_stubcopy = \ - $(STRIP) --strip-debug -o $@ $<; \ + $(STRIP) --strip-debug $(STUBCOPY_RM_SECTIONS) -o $@ $<; \ if $(OBJDUMP) -r $@ | grep $(STUBCOPY_RELOC-y); then \ echo "$@: absolute symbol references not allowed in the EFI stub" >&2; \ /bin/false; \ -- 2.55.0 ```