linux-kernel - Re: [PATCH v2] Add suspend/resume for HPET

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Date:	Sat, 31 Mar 2007 10:58:29 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Maxim Levitsky <maximlevitsky@...il.com>, tglx@...utronix.de,
	Sergei Shtylyov <sshtylyov@...mvista.com>,
	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 v2] Add suspend/resume for HPET

On Sat, 2007-03-31 at 19:17 +0200, Ingo Molnar wrote:

> yeah. There's some practical problems that need to be sorted out: much 
> of the current GTOD code is irq-driven (and all GTOD locks are 
> irq-safe), while the sysfs code needs to run in process-context level. 
> 
> Clocksources 'arrive' and 'depart' in hardirq context (which is the 
> primary place where we notice their breakage, determine that they are 
> now verified to be usable, etc.). This came partly from legacy: the 
> gradual conversion of the monolithic time code, and the need to preserve 
> GTOD and non-GTOD architectures without too much duplication. It also 
> came partly because there's also a fundamental need to have accurate 
> time, which is better served from irq context.
> 

Is this in reference to the irq-context clocksource polling stuff? I
don't see a dire reason to keep that code, and I agree removing that is
a certainly a worth while cleanup .. I added this cleanup to one of my
trees when you first suggested it , and there is some infrastructure
that really should be added to facilitate it.

Daniel

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