linux-kernel - Re: [RFC PATCH v2 09/31] kvx: Add build infrastructure

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Message-Id: <aa4d68b2-b5b5-4c17-a44f-7c6db443ea4c@app.fastmail.com>
Date:   Fri, 20 Jan 2023 15:39:22 +0100
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Yann Sionneau" <ysionneau@...ray.eu>,
        "Jonathan Corbet" <corbet@....net>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Marc Zyngier" <maz@...nel.org>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        "Will Deacon" <will@...nel.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Boqun Feng" <boqun.feng@...il.com>,
        "Mark Rutland" <mark.rutland@....com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Kees Cook" <keescook@...omium.org>,
        "Oleg Nesterov" <oleg@...hat.com>,
        "Ingo Molnar" <mingo@...hat.com>,
        "Waiman Long" <longman@...hat.com>,
        "Aneesh Kumar" <aneesh.kumar@...ux.ibm.com>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Nicholas Piggin" <npiggin@...il.com>,
        "Paul Moore" <paul@...l-moore.com>,
        "Eric Paris" <eparis@...hat.com>,
        "Christian Brauner" <brauner@...nel.org>,
        "Paul Walmsley" <paul.walmsley@...ive.com>,
        "Palmer Dabbelt" <palmer@...belt.com>,
        "Albert Ou" <aou@...s.berkeley.edu>,
        "Jules Maselbas" <jmaselbas@...ray.eu>,
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        "Vincent Chardon" <vincent.chardon@...ys-design.com>,
        Marc Poulhiès <dkm@...aplop.net>,
        "Julian Vetter" <jvetter@...ray.eu>,
        "Samuel Jones" <sjones@...ray.eu>,
        "Ashley Lesdalons" <alesdalons@...ray.eu>,
        "Thomas Costis" <tcostis@...ray.eu>,
        "Marius Gligor" <mgligor@...ray.eu>,
        "Jonathan Borne" <jborne@...ray.eu>,
        "Julien Villette" <jvillette@...ray.eu>,
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        "Guillaume Missonnier" <gmissonnier@...ray.eu>,
        "Alex Michon" <amichon@...ray.eu>,
        "Huacai Chen" <chenhuacai@...nel.org>,
        "WANG Xuerui" <git@...0n.name>,
        "Shaokun Zhang" <zhangshaokun@...ilicon.com>,
        "John Garry" <john.garry@...wei.com>,
        "Guangbin Huang" <huangguangbin2@...wei.com>,
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        "Bibo Mao" <maobibo@...ngson.cn>,
        "Atish Patra" <atishp@...shpatra.org>,
        "Jason A . Donenfeld" <Jason@...c4.com>,
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        "Janosch Frank" <frankja@...ux.ibm.com>,
        "Alexey Dobriyan" <adobriyan@...il.com>
Cc:     "Benjamin Mugnier" <mugnier.benjamin@...il.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-mm@...ck.org,
        Linux-Arch <linux-arch@...r.kernel.org>, linux-audit@...hat.com,
        linux-riscv@...ts.infradead.org, bpf@...r.kernel.org
Subject: Re: [RFC PATCH v2 09/31] kvx: Add build infrastructure

On Fri, Jan 20, 2023, at 15:09, Yann Sionneau wrote:
>      - Fix clean target raising an error from gcc (LIBGCC)

I had not noticed this on v1 but:

> +# Link with libgcc to get __div* builtins.
> +LIBGCC	:= $(shell $(CC) $(DEFAULT_OPTS) --print-libgcc-file-name)

It's better to copy the bits of libgcc that you actually need
than to include the whole thing. The kernel is in a weird
state that is neither freestanding nor the normal libc based
environment, so we generally want full control over what is
used. This is particularly important for 32-bit architectures
that do not want the 64-bit division, but there are probably
enough other cases as well.

     Arnd