linux-kernel - Re: [PATCH v6 5/8] EDAC/ghes: Make ghes_edac a proper module to remove the dependency on ghes

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Date:   Fri, 23 Sep 2022 17:43:22 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Justin He <Justin.He@....com>
Cc:     Len Brown <lenb@...nel.org>, James Morse <James.Morse@....com>,
        Tony Luck <tony.luck@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Richter <rric@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Qiuxu Zhuo <qiuxu.zhuo@...el.com>,
        Yazen Ghannam <yazen.ghannam@....com>,
        Jan Luebbe <jlu@...gutronix.de>,
        Khuong Dinh <khuong@...amperecomputing.com>,
        Kani Toshi <toshi.kani@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "devel@...ica.org" <devel@...ica.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        nd <nd@....com>
Subject: Re: [PATCH v6 5/8] EDAC/ghes: Make ghes_edac a proper module to
 remove the dependency on ghes

On Thu, Sep 22, 2022 at 08:26:16AM +0000, Justin He wrote:
> If there is no ghes_present flag.
> What if ghes.disable is passed to kernel boot parameter and then ghes_edac is
> loaded by modprobe?
> Thus, ghes_edac can be loaded even if ghes is disabled. (ghes_dev list is null)

Yes, and what happens if ghes_dev is NULL?

The other drivers would do in their init function:

	struct list_head *ghes_devs;

	ghes_devs = ghes_get_devices();
	if (ghes_devs)
		return -ENODEV;

	/* Continue init */

and then load in that case because user has disabled GHES and thus no
ghes_edac either. So the platform-specific one loads.

Right?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette