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From:   Masahiro Yamada <masahiroy@kernel.org>
Date:   Wed, 11 Oct 2023 21:52:45 +0900
Message-ID: <CAK7LNATmaSXQYFMZEw2vpn6td10+huck-vy-Rbo5Brys+j_Stg@mail.gmail.com>
Subject: Re: [PATCH 4/5] kbuild: unify vdso_install rules
To:     Guo Ren <guoren@kernel.org>
Cc:     linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org,
        linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org,
        linux-s390@vger.kernel.org, linux-um@lists.infradead.org,
        loongarch@lists.linux.dev, sparclinux@vger.kernel.org,
        x86@kernel.org, Albert Ou <aou@eecs.berkeley.edu>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Andy Lutomirski <luto@kernel.org>,
        Borislav Petkov <bp@alien8.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christian Borntraeger <borntraeger@linux.ibm.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "David S. Miller" <davem@davemloft.net>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Huacai Chen <chenhuacai@kernel.org>,
        Ingo Molnar <mingo@redhat.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nicolas Schier <nicolas@fjasle.eu>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Russell King <linux@armlinux.org.uk>,
        Sven Schnelle <svens@linux.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Vasily Gorbik <gor@linux.ibm.com>,
        WANG Xuerui <kernel@xen0n.name>, Will Deacon <will@kernel.org>
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On Wed, Oct 11, 2023 at 11:24=E2=80=AFAM Guo Ren <guoren@kernel.org> wrote:
>
> On Mon, Oct 9, 2023 at 8:42=E2=80=AFPM Masahiro Yamada <masahiroy@kernel.=
org> wrote:

> > --- a/arch/riscv/Makefile
> > +++ b/arch/riscv/Makefile
> > @@ -131,12 +131,6 @@ endif
> >  libs-y +=3D arch/riscv/lib/
> >  libs-$(CONFIG_EFI_STUB) +=3D $(objtree)/drivers/firmware/efi/libstub/l=
ib.a
> >
> > -PHONY +=3D vdso_install
> > -vdso_install:
> > -       $(Q)$(MAKE) $(build)=3Darch/riscv/kernel/vdso $@
> > -       $(if $(CONFIG_COMPAT),$(Q)$(MAKE) \
> > -               $(build)=3Darch/riscv/kernel/compat_vdso compat_$@)
> > -
> >  ifeq ($(KBUILD_EXTMOD),)
> >  ifeq ($(CONFIG_MMU),y)
> >  prepare: vdso_prepare
> > @@ -148,6 +142,9 @@ vdso_prepare: prepare0
> >  endif
> >  endif
> >
> > +vdso-install-y                 +=3D arch/riscv/kernel/vdso/vdso.so.dbg
> > +vdso-install-$(CONFIG_COMPAT)  +=3D arch/riscv/kernel/compat_vdso/comp=
at_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 =3D INSTALL $@
      cmd_compat_vdso_install =3D cp $(obj)/$@.dbg $(MODLIB)/compat_vdso/$@


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.


--=20
Best Regards
Masahiro Yamada