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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Message-ID: <DBBPR08MB45383B270676A17CEEC36E75F7539@DBBPR08MB4538.eurprd08.prod.outlook.com>
Date:   Sun, 25 Sep 2022 15:07:12 +0000
From:   Justin He <Justin.He@....com>
To:     Borislav Petkov <bp@...en8.de>
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

Hi Borislav

> -----Original Message-----
> From: Borislav Petkov <bp@...en8.de>
> Sent: Friday, September 23, 2022 11:43 PM
> 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-kernel@...r.kernel.org;
> linux-edac@...r.kernel.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; 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?
> 
Okay, I am fine if it is allowed to register ghes_dev with
> 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.

Okay, I am fine with removing ghes_present and ghes_edac_preferred if
It is ok to register empty ghes_dev list without prompting an error 


--
Cheers,
Justin (Jia He)