linux-kernel - Re: [PATCH v3 2/3] Kconfig: Add dependencies of POWER

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Message-ID: <B4EC5520E6B64383+2324a0e9-db14-421b-876f-2d4f2f2f746d@tinylab.org>
Date:   Fri, 15 Sep 2023 09:22:17 +0800
From:   Yuan Tan <tanyuan@...ylab.org>
To:     Dave Hansen <dave.hansen@...el.com>, tglx@...utronix.de,
        mingo@...hat.com
Cc:     bp@...en8.de, dave.hansen@...ux.intel.com,
        linux-kernel@...r.kernel.org, x86@...nel.org, falcon@...ylab.org,
        w@....eu, linux@...ssschuh.net
Subject: Re: [PATCH v3 2/3] Kconfig: Add dependencies of POWER_RESET for x86


On 9/15/2023 12:09 AM, Dave Hansen wrote:
> On 9/14/23 03:36, Yuan Tan wrote:
>> x86 and x86_64's power off depends on ACPI and PCI to work. Enable them
>> when POWER_RESET is set for convenience.
> I'm a bit confused by this.
>
> Which code is this referring to, exactly?  Are you saying that no x86
> system can power off or reset unless it supports ACPI or PCI?

Yes, after testing on qemu-system-x86_64 and qemu-system-i386, I found 
that x86 can only power off when it enable ACPI and PCI.

I wanted to test nolibc based on tinyconfig and found it hard to find 
the dependence to enable poweroff.