linux-kernel - Re: [PATCH 4/5] kbuild: unify vdso

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Date:   Wed, 11 Oct 2023 21:52:45 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Guo Ren <guoren@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-um@...ts.infradead.org,
        loongarch@...ts.linux.dev, sparclinux@...r.kernel.org,
        x86@...nel.org, Albert Ou <aou@...s.berkeley.edu>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        "H. Peter Anvin" <hpa@...or.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Schier <nicolas@...sle.eu>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Russell King <linux@...linux.org.uk>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        WANG Xuerui <kernel@...0n.name>, Will Deacon <will@...nel.org>
Subject: Re: [PATCH 4/5] kbuild: unify vdso_install rules

On Wed, Oct 11, 2023 at 11:24 AM Guo Ren <guoren@...nel.org> wrote:
>
> On Mon, Oct 9, 2023 at 8:42 PM Masahiro Yamada <masahiroy@...nel.org> wrote:

> > --- a/arch/riscv/Makefile
> > +++ b/arch/riscv/Makefile
> > @@ -131,12 +131,6 @@ endif
> >  libs-y += arch/riscv/lib/
> >  libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
> >
> > -PHONY += vdso_install
> > -vdso_install:
> > -       $(Q)$(MAKE) $(build)=arch/riscv/kernel/vdso $@
> > -       $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
> > -               $(build)=arch/riscv/kernel/compat_vdso compat_$@)
> > -
> >  ifeq ($(KBUILD_EXTMOD),)
> >  ifeq ($(CONFIG_MMU),y)
> >  prepare: vdso_prepare
> > @@ -148,6 +142,9 @@ vdso_prepare: prepare0
> >  endif
> >  endif
> >
> > +vdso-install-y                 += arch/riscv/kernel/vdso/vdso.so.dbg
> > +vdso-install-$(CONFIG_COMPAT)  += arch/riscv/kernel/compat_vdso/compat_vdso.so.dbg:../compat_vdso/compat_vdso.so
> Why do we need ":../compat_vdso/compat_vdso.so" here?




All architectures except riscv install vdso files
to /lib/modules/$(uname -r)/vdso/.



See the following code in arch/riscv/kernel/compat_vdso/Makefile:


quiet_cmd_compat_vdso_install = INSTALL $@
      cmd_compat_vdso_install = cp $(obj)/$@...g $(MODLIB)/compat_vdso/$@




Riscv copies the compat vdso to
/lib/modules/$(uname -r)/compat_vdso/.



This commit preserves the current installation path as-is.

If the riscv maintainers agree, we can change the
installation destination to /lib/modules/$(uname -r)/vdso/
for consistency.



-- 
Best Regards
Masahiro Yamada