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kbuild: Introduce Kconfig symbol for linking vmlinux with relocations

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Some architectures build vmlinux with static relocations preserved, but
strip them again from the final vmlinux image. Arch specific tools
consume these static relocations in order to construct relocation tables
for KASLR.

The fact that vmlinux is created, consumed and subsequently updated goes
against the typical, declarative paradigm used by Make, which is based
on rules and dependencies. So as a first step towards cleaning this up,
introduce a Kconfig symbol to declare that the arch wants to consume the
static relocations emitted into vmlinux. This will be wired up further
in subsequent patches.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Ard Biesheuvel
2025-03-11 12:06:19 +01:00
committed by Masahiro Yamada
parent e22bbb8e97
commit 9b400d1725
10 changed files with 17 additions and 12 deletions
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2
arch/s390/Makefile
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@@ -15,7 +15,7 @@ KBUILD_CFLAGS_MODULE += -fPIC
KBUILD_AFLAGS += -m64
KBUILD_CFLAGS += -m64
KBUILD_CFLAGS += -fPIC
LDFLAGS_vmlinux := -no-pie --emit-relocs --discard-none
LDFLAGS_vmlinux := -no-pie
extra_tools := relocs
aflags_dwarf := -Wa,-gdwarf-2
KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__