linux-kernel - Re: [PATCH v3] acpi: Fix ARM32 platforms compile issue introduced by fw

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Date:   Thu, 23 Nov 2023 09:17:49 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Dan Williams <dan.j.williams@...el.com>,
        Arnd Bergmann <arnd@...db.de>
Cc:     Dave Jiang <dave.jiang@...el.com>, rafael@...nel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, lenb@...nel.org,
        robert.moore@...el.com, Jonathan.Cameron@...wei.com,
        guohanjun@...wei.com, linux-acpi@...r.kernel.org,
        acpica-devel@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, cfsworks@...il.com
Subject: Re: [PATCH v3] acpi: Fix ARM32 platforms compile issue introduced by
 fw_table changes

On Wed, Nov 22, 2023 at 10:32 PM Dan Williams <dan.j.williams@...el.com> wrote:

> It concerns me that neither linux-next nor 0day robot exposure reported
> this problem.
>
> Does ARM32 require manual compilation coverage these days or was this
> just a series of unfortunate events that the build bots missed this?

It's not just ARM32, I saw it on ARM64 as well and I'm pretty
sure it appears on any bare metal "none" compiler.

kernel.org host "nolibc" cross compilers (Arnd makes these):
https://mirrors.edge.kernel.org/pub/tools/crosstool/
and those WORK, because they use the kernel minimal
libc which defines __linux__.

So a "nolibc" compiler works but not "none" compilers.

I think the test robots all use Arnds nolibc compilers or the
compilers from distributions so they don't see this.

A typical example of breaking compilers: ARMs supported
"none" compilers:
https://developer.arm.com/downloads/-/arm-gnu-toolchain-downloads

Yours,
Linus Walleij