linux-kernel - Re: [PATCH v2] watchdog: add driver for StreamLabs USB watchdog device

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Message-ID: <1461051988.15527.6.camel@suse.com>
Date:	Tue, 19 Apr 2016 09:46:28 +0200
From:	Oliver Neukum <oneukum@...e.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Alexey Klimov <klimov.linux@...il.com>, yury.norov@...il.com,
	wim@...ana.be, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v2] watchdog: add driver for StreamLabs USB watchdog
 device

On Mon, 2016-04-18 at 09:39 -0700, Guenter Roeck wrote:
> > Possibly. We have never gone that route. The obvious problems is
> that
> > I am not sure our alignment is known before boot.
> > 
> Seems scary. I always thought that the alignment associated with
> ____cacheline_aligned would be the maximum possible for a given
> build/architecture. If not, what is the value of having
> ____cacheline_aligned in the first place ?

I thought it was for performance to prevent cache bouncing.
I honestly don't know. You'd have to ask a specific question
on LKML.

	Sorry
		Oliver