linux-kernel - Re: [PATCH] x86/reboot: Use efi reboot for Acer TravelMate X514-51T

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Date:   Mon, 8 Apr 2019 14:02:14 +0800
From:   Jian-Hong Pan <jian-hong@...lessm.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>,
        Daniel Drake <drake@...lessm.com>
Subject: Re: [PATCH] x86/reboot: Use efi reboot for Acer TravelMate X514-51T

Thomas Gleixner <tglx@...utronix.de> 於 2019年4月6日 週六 上午5:14寫道：
>
> On Mon, 1 Apr 2019, Jian-Hong Pan wrote:
> > +/*
> > + * Some machines require the "reboot=e" commandline options
> > + */
> > +static int __init set_efi_reboot(const struct dmi_system_id *d)
> > +{
> > +     if (reboot_type != BOOT_EFI) {
> > +             reboot_type = BOOT_EFI;
>
> So if EFI is disabled in the kernel this will fall through to BOOT_BIOS. Is
> that intended behaviour?

If not choose EFI as the reboot type, system will use APCI reboot type
on Acer TravelMate X514-51T.
If the reboot type is set as BIOS by appending "reboot=b", system
cannot reboot and hangs up when shutdown.

> > +             pr_info("%s series board detected. Selecting %s-method for reboot.\n",
> > +                     d->ident, "EFI");
>
> Is thee a reason not to write "EFI" in the string itself?

Just simply follow the format like functions: set_acpi_reboot, set_bios_reboot
https://elixir.bootlin.com/linux/v5.1-rc4/source/arch/x86/kernel/reboot.c#L60

BR,
Jian-Hong Pan