From: Arvind Sankar <nivedita@alum.mit.edu>
Date: Thu, 16 Apr 2020 11:12:25 -0400
Subject: efi/arm: Remove __efistub_global annotation
Patch-mainline: v5.8-rc1
Git-commit: 420b6d00ca94ce5b6578b1bc12e767ac7a0251ac
References: jsc#SLE-16407

Instead of using __efistub_global to force variables into the .data
section, leave them in the .bss but pull the EFI stub's .bss section
into .data in the linker script for the compressed kernel.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20200416151227.3360778-2-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Lee, Chun-Yi <jlee@suse.com>
---
 arch/arm/boot/compressed/vmlinux.lds.S |    2 +-
 drivers/firmware/efi/libstub/Makefile  |    7 ++++---
 drivers/firmware/efi/libstub/efistub.h |    2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

--- a/arch/arm/boot/compressed/vmlinux.lds.S
+++ b/arch/arm/boot/compressed/vmlinux.lds.S
@@ -79,7 +79,7 @@ SECTIONS
      * The EFI stub always executes from RAM, and runs strictly before the
      * decompressor, so we can make an exception for its r/w data, and keep it
      */
-    *(.data.efistub)
+    *(.data.efistub .bss.efistub)
     __pecoff_data_end = .;
 
     /*
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -101,8 +101,9 @@ quiet_cmd_stubcopy = STUBCPY $@
 
 #
 # ARM discards the .data section because it disallows r/w data in the
-# decompressor. So move our .data to .data.efistub, which is preserved
-# explicitly by the decompressor linker script.
+# decompressor. So move our .data to .data.efistub and .bss to .bss.efistub,
+# which are preserved explicitly by the decompressor linker script.
 #
-STUBCOPY_FLAGS-$(CONFIG_ARM)	+= --rename-section .data=.data.efistub
+STUBCOPY_FLAGS-$(CONFIG_ARM)	+= --rename-section .data=.data.efistub	\
+				   --rename-section .bss=.bss.efistub,load,alloc
 STUBCOPY_RELOC-$(CONFIG_ARM)	:= R_ARM_ABS
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -25,7 +25,7 @@
 #define EFI_ALLOC_ALIGN		EFI_PAGE_SIZE
 #endif
 
-#if defined(CONFIG_ARM) || defined(CONFIG_X86)
+#if defined(CONFIG_X86)
 #define __efistub_global	__section(.data)
 #else
 #define __efistub_global