linux-kernel - Re: [PATCH] arm64: move --fix-cortex-a53-843419 linker test to Kconfig

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Message-ID: <20210328111213.GA17535@arm.com>
Date:   Sun, 28 Mar 2021 12:12:15 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Will Deacon <will@...nel.org>
Subject: Re: [PATCH] arm64: move --fix-cortex-a53-843419 linker test to
 Kconfig

On Sun, Mar 28, 2021 at 03:59:29PM +0900, Masahiro Yamada wrote:
> On Fri, Mar 26, 2021 at 11:36 PM Catalin Marinas
> <catalin.marinas@....com> wrote:
> > On Wed, Mar 24, 2021 at 04:11:28PM +0900, Masahiro Yamada wrote:
> > > $(call ld-option, --fix-cortex-a53-843419) in arch/arm64/Makefile is
> > > evaluated every time even for Make targets that do not need the linker,
> > > such as "make ARCH=arm64 install".
> > >
> > > Recently, the Kbuild tree queued up a patch to avoid needless
> > > compiler/linker flag evaluation. I beleive it is a good improvement
> > > itself, but causing a false-positive warning for arm64 installation
> > > in linux-next. (Thanks to Nathan for the report)
> > >
> > > Kconfig can test the linker capability just once, and store it in the
> > > .config file. The build and installation steps that follow do not need
> > > to test the liniker over again.
> > >
> > > Reported-by: Nathan Chancellor <nathan@...nel.org>
> > > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > > ---
> > >
> > > I was not sure what the preferred CONFIG option name is.
> > > Please suggest a one if you have a better idea.
> > >
> > >
> > >  arch/arm64/Kconfig  | 3 +++
> > >  arch/arm64/Makefile | 2 +-
> > >  2 files changed, 4 insertions(+), 1 deletion(-)
> >
> > Would you like this patch to go in via the arm64 tree or you will queue
> > it via the kbuild tree?
> 
> I applied this to linux-kbuild with Will's Ack.

Great, I'll cross it off my list. Thanks.

-- 
Catalin