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| author | Masahiro Yamada <masahiroy@kernel.org> | 2023-10-14 19:54:35 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2023-10-28 21:09:02 +0900 |
| commit | 56769ba4b297a629148eb24d554aef72d1ddfd9e (patch) | |
| tree | 7ae892b127b68f2bc991be26b7eb3d416c0791c1 /arch/x86/Makefile | |
| parent | 1b6272894f2dfc25374add1dcfa37efc88384ff8 (diff) | |
| download | lwn-56769ba4b297a629148eb24d554aef72d1ddfd9e.tar.gz lwn-56769ba4b297a629148eb24d554aef72d1ddfd9e.zip | |
kbuild: unify vdso_install rules
Currently, there is no standard implementation for vdso_install,
leading to various issues:
1. Code duplication
Many architectures duplicate similar code just for copying files
to the install destination.
Some architectures (arm, sparc, x86) create build-id symlinks,
introducing more code duplication.
2. Unintended updates of in-tree build artifacts
The vdso_install rule depends on the vdso files to install.
It may update in-tree build artifacts. This can be problematic,
as explained in commit 19514fc665ff ("arm, kbuild: make
"make install" not depend on vmlinux").
3. Broken code in some architectures
Makefile code is often copied from one architecture to another
without proper adaptation.
'make vdso_install' for parisc does not work.
'make vdso_install' for s390 installs vdso64, but not vdso32.
To address these problems, this commit introduces a generic vdso_install
rule.
Architectures that support vdso_install need to define vdso-install-y
in arch/*/Makefile. vdso-install-y lists the files to install.
For example, arch/x86/Makefile looks like this:
vdso-install-$(CONFIG_X86_64) += arch/x86/entry/vdso/vdso64.so.dbg
vdso-install-$(CONFIG_X86_X32_ABI) += arch/x86/entry/vdso/vdsox32.so.dbg
vdso-install-$(CONFIG_X86_32) += arch/x86/entry/vdso/vdso32.so.dbg
vdso-install-$(CONFIG_IA32_EMULATION) += arch/x86/entry/vdso/vdso32.so.dbg
These files will be installed to $(MODLIB)/vdso/ with the .dbg suffix,
if exists, stripped away.
vdso-install-y can optionally take the second field after the colon
separator. This is needed because some architectures install a vdso
file as a different base name.
The following is a snippet from arch/arm64/Makefile.
vdso-install-$(CONFIG_COMPAT_VDSO) += arch/arm64/kernel/vdso32/vdso.so.dbg:vdso32.so
This will rename vdso.so.dbg to vdso32.so during installation. If such
architectures change their implementation so that the base names match,
this workaround will go away.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Sven Schnelle <svens@linux.ibm.com> # s390
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Reviewed-by: Guo Ren <guoren@kernel.org>
Acked-by: Helge Deller <deller@gmx.de> # parisc
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/x86/Makefile')
| -rw-r--r-- | arch/x86/Makefile | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/x86/Makefile b/arch/x86/Makefile index 5bfe5caaa444..3ff53a2d4ff0 100644 --- a/arch/x86/Makefile +++ b/arch/x86/Makefile @@ -291,9 +291,10 @@ PHONY += install install: $(call cmd,install) -PHONY += vdso_install -vdso_install: - $(Q)$(MAKE) $(build)=arch/x86/entry/vdso $@ +vdso-install-$(CONFIG_X86_64) += arch/x86/entry/vdso/vdso64.so.dbg +vdso-install-$(CONFIG_X86_X32_ABI) += arch/x86/entry/vdso/vdsox32.so.dbg +vdso-install-$(CONFIG_X86_32) += arch/x86/entry/vdso/vdso32.so.dbg +vdso-install-$(CONFIG_IA32_EMULATION) += arch/x86/entry/vdso/vdso32.so.dbg archprepare: checkbin checkbin: |