linux-kernel - Re: [PATCH] ACPI: acenv: Permit compilation from within the kernel

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Date:   Mon, 20 Nov 2023 17:38:32 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Dave Jiang <dave.jiang@...el.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Sam Edwards <cfsworks@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Len Brown <lenb@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Arnd Bergmann <arnd@...db.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ACPI: acenv: Permit compilation from within the kernel

On Mon, Nov 20, 2023 at 5:19 PM Dave Jiang <dave.jiang@...el.com> wrote:
>
>
>
> On 11/20/23 08:46, Rafael J. Wysocki wrote:
> > On Tue, Nov 14, 2023 at 7:09 PM Sam Edwards <cfsworks@...il.com> wrote:
> >>
> >> On 11/13/23 16:08, Linus Walleij wrote:
> >>> After commit a103f46633fd the kernel stopped compiling for
> >>> several ARM32 platforms that I am building with a bare metal
> >>> compiler. Bare metal compilers (arm-none-eabi-) don't
> >>> define __linux__.
> >>
> >> Hi Linus,
> >>
> >> I saw the same baremetal-compiler error here on the ARM64 side of the
> >> fence, and narrowed the problem to the same commit as you.
> >>
> >>>
> >>> This is because the header <acpi/platform/acenv.h> is now
> >>> in the include path for <linux/irq.h>:
> >>
> >> More generally, I think it's because of this addition to linux/acpi.h:
> >> +#include <linux/fw_table.h>
> >>
> >> linux/acpi.h is supposed to ensure _LINUX is defined (if it isn't
> >> already done by a non-baremetal compiler) before we start pulling in
> >> ACPICA includes, so that ACPICA knows the platform. But because
> >> fw_table.h contains:
> >> #include <linux/acpi.h>
> >> #include <acpi/acpi.h>
> >>
> >> ...the circular include does nothing (linux/acpi.h's include guard stops
> >> the include before _LINUX is defined) and we end up pulling in
> >> acpi/acpi.h before we're ready.
>
> Not including either causes compile errors for me.

Interesting.  What errors do you get if you include linux/acpi.h only?

It should not be necessary to include acpi/acpi.h in addition to
linux/acpi.h, because the latter is expected to include the former.
If it doesn't do that, something is amiss.

> And directly including acpi/acpi.h w/o linux/acpi.h causes triggering the #error and some other stuff:
>
> ./include/acpi/platform/aclinux.h:18:2: error: #error "Please don't include <acpi/acpi.h> directly, include <linux/acpi.h> instead."
>    18 | #error "Please don't include <acpi/acpi.h> directly, include <linux/acpi.h> instead."
>       |  ^~~~~
>
>
> Only including linux/acpi.h:
> In file included from ./include/linux/acpi.h:18,
>                  from init/main.c:30:
> ./include/linux/fw_table.h:32:37: error: field ‘common’ has incomplete type
>    32 |         struct acpi_subtable_header common;
>       |                                     ^~~~~~
> ./include/linux/fw_table.h:33:36: error: field ‘hmat’ has incomplete type
>    33 |         struct acpi_hmat_structure hmat;
>       |                                    ^~~~
> ./include/linux/fw_table.h:34:40: error: field ‘prmt’ has incomplete type
>    34 |         struct acpi_prmt_module_header prmt;
>       |                                        ^~~~
> ./include/linux/fw_table.h:35:33: error: field ‘cedt’ has incomplete type
>    35 |         struct acpi_cedt_header cedt;
>       |                                 ^~~~
>
>
> >
> > Yes, that's the problem AFAICS.  Dave?
> >
> > What about moving the fw_table.h include in linux/acpi.h below the
> > mutex.h one, along with the EXPORT_SYMBOL_ACPI_LIB-related
> > definitions?
>
> This builds cleanly for me.

OK, so I'm wondering if this also helps the other people in this thread.