linux-kernel - Re: [ PATCH] Add suspend/resume for HPET was: Re: [3/6] 2.6.21-rc4: known regressions

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Date:	Wed, 28 Mar 2007 22:08:58 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Maxim <maximlevitsky@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, pavel@...e.cz,
	linux-pm@...ts.osdl.org, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Jens Axboe <jens.axboe@...cle.com>,
	Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
	jgarzik@...ox.com, linux-ide@...r.kernel.org,
	"Michael S. Tsirkin" <mst@...lanox.co.il>
Subject: Re: [ PATCH] Add suspend/resume for HPET was: Re: [3/6] 2.6.21-rc4:
 known regressions



On Thu, 29 Mar 2007, Maxim wrote:
>
> 	I am sending here a patch that as was discussed here adds hpet to list of system devices
> 	and adds suspend/resume hooks this way.
> 	I tested it and it works fine.

Ok, it certainly looks better, but it *also* looks like it just assumes 
the HPET is there. Which would work in testing _with_ a HPET, but would 
likely break on hardware without one, no?

Shouldn't there be at least something like a

	if (!is_hpet_capable())
		return 0;

at the top of that init routine? I'd also expect that you'd need to check 
that "hpet_virt_address" is valid or something?

(Or, better yet, shouldn't we set "boot_hpet_disable" when we decide not 
to use the HPET, and set hpet_virt_address to NULL?)

		Linus
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