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x86/efi: Drop EFI stub .bss from .data section

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Now that the EFI stub always zero inits its BSS section upon entry,
there is no longer a need to place the BSS symbols carried by the stub
into the .data section.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230912090051.4014114-18-ardb@google.com
This commit is contained in:
Ard Biesheuvel 2023-09-12 09:00:52 +00:00 committed by Ingo Molnar
parent 9fdfb15a3d
commit 5f51c5d0e9
2 changed files with 0 additions and 8 deletions
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1
arch/x86/boot/compressed/vmlinux.lds.S
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@ -47,7 +47,6 @@ SECTIONS
_data = . ;
*(.data)
*(.data.*)
*(.bss.efistub)
_edata = . ;
}
. = ALIGN(L1_CACHE_BYTES);

7
drivers/firmware/efi/libstub/Makefile
View File

@ -108,13 +108,6 @@ lib-y := $(patsubst %.o,%.stub.o,$(lib-y))
# https://bugs.llvm.org/show_bug.cgi?id=46480
STUBCOPY_FLAGS-y += --remove-section=.note.gnu.property
#
# For x86, bootloaders like systemd-boot or grub-efi do not zero-initialize the
# .bss section, so the .bss section of the EFI stub needs to be included in the
# .data section of the compressed kernel to ensure initialization. Rename the
# .bss section here so it's easy to pick out in the linker script.
#
STUBCOPY_FLAGS-$(CONFIG_X86) += --rename-section .bss=.bss.efistub,load,alloc
STUBCOPY_RELOC-$(CONFIG_X86_32) := R_386_32
STUBCOPY_RELOC-$(CONFIG_X86_64) := R_X86_64_64