Subject: [PATCH v8 12/12] efi/libstub: disable SCS

From: Sami Tolvanen <[email-masked]>
Date: Tue, 18 Feb 2020 16:08:17 -0800

Disable SCS for the EFI stub and allow x18 to be used.

Suggested-by: James Morse <[email-masked]>
Signed-off-by: Sami Tolvanen <[email-masked]>
---
 drivers/firmware/efi/libstub/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index 98a81576213d..dff9fa5a3f1c 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -30,6 +30,9 @@ KBUILD_CFLAGS			:= $(cflags-y) -DDISABLE_BRANCH_PROFILING \
 				   $(call cc-option,-fno-stack-protector) \
 				   -D__DISABLE_EXPORTS
 
+#  remove SCS flags from all objects in this directory
+KBUILD_CFLAGS := $(filter-out -ffixed-x18 $(CC_FLAGS_SCS), $(KBUILD_CFLAGS))
+
 GCOV_PROFILE			:= n
 KASAN_SANITIZE			:= n
 UBSAN_SANITIZE			:= n
-- 
2.25.0.265.gbab2e86ba0-goog

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