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From:   Bhupesh Sharma <bhsharma@redhat.com>
Date:   Tue, 24 Jul 2018 10:49:05 +0530
Message-ID: <CACi5LpO=ObREcWfr6Y+7+bv3c1VkOEkw80CLELHDO6QD4xbeow@mail.gmail.com>
Subject: Re: [PATCH v3.1 0/4] arm64: kexec,kdump: fix boot failures on
 acpi-only system
To:     Will Deacon <will.deacon@arm.com>
Cc:     AKASHI Takahiro <takahiro.akashi@linaro.org>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        "Baicar, Tyler" <tbaicar@codeaurora.org>,
        Dave Young <dyoung@redhat.com>,
        James Morse <james.morse@arm.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Al Stone <al.stone@linaro.org>,
        Graeme Gregory <graeme.gregory@linaro.org>,
        Hanjun Guo <hanjun.guo@linaro.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Kexec Mailing List <kexec@lists.infradead.org>
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Hi Will,

On Mon, Jul 23, 2018 at 7:05 PM, Will Deacon <will.deacon@arm.com> wrote:
> On Tue, Jul 17, 2018 at 02:12:23PM +0900, AKASHI Takahiro wrote:
>> On Fri, Jul 13, 2018 at 07:49:45AM +0200, Ard Biesheuvel wrote:
>> > On 13 July 2018 at 02:34, AKASHI Takahiro <takahiro.akashi@linaro.org> wrote:
>> > > On Thu, Jul 12, 2018 at 05:49:19PM +0100, Will Deacon wrote:
>> > >> Hi Akashi,
>> > >>
>> > >> On Tue, Jul 10, 2018 at 08:42:25AM +0900, AKASHI Takahiro wrote:
>> > >> > This patch series is a set of bug fixes to address kexec/kdump
>> > >> > failures which are sometimes observed on ACPI-only system and reported
>> > >> > in LAK-ML before.
>> > >>
>> > >> I tried picking this up, along with Ard's fixup, but I'm seeing a build
>> > >> failure for allmodconfig:
>> > >>
>> > >> arch/arm64/kernel/acpi.o: In function `__acpi_get_mem_attribute':
>> > >> acpi.c:(.text+0x60): undefined reference to `efi_mem_attributes'
>> > >>
>> > >> I didn't investigate further. Please can you fix this?
>> > >
>> > > Because CONFIG_ACPI is on and CONFIG_EFI is off.
>> > >
>> > > This can happen in allmodconfig as CONFIG_EFI depends on
>> > > !CONFIG_CPU_BIG_ENDIAN, which is actually on in this case.
>> > >
>> >
>> > Allowing both CONFIG_ACPI and CONFIG_CPU_BIG_ENDIAN to be configured
>> > makes no sense at all. Things will surely break if you start using BE
>> > memory accesses while parsing ACPI tables.
>> >
>> > Allowing CONFIG_ACPI without CONFIG_EFI makes no sense either, since
>> > on arm64, the only way to find the ACPI tables is through a UEFI
>> > configuration table.
>>
>>
>> Do you agree to this?
>
> Yes; please post a new series which resolves these dependencies and includes
> Ard's fixup from before.

I see that Akashi has already posted a v4 here with the suggested fixes:
https://lkml.org/lkml/2018/7/22/321

Thanks,
Bhupesh