linux-kernel - Re: [PATCH] x86-64: use EFI to deal with platform wall clock

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Message-ID: <20120525153416.GA16973@srcf.ucam.org>
Date:	Fri, 25 May 2012 16:34:16 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	mingo@...e.hu, tglx@...utronix.de, matt.fleming@...ux.intel.com,
	linux-kernel@...r.kernel.org, hpa@...or.com
Subject: Re: [PATCH] x86-64: use EFI to deal with platform wall clock

On Fri, May 25, 2012 at 04:30:11PM +0100, Jan Beulich wrote:
> >>> On 25.05.12 at 17:24, Matthew Garrett <mjg59@...f.ucam.org> wrote:
> > Looks good, but should we also be changing get_time to return in UTC? 
> 
> Imo that would be a separate change though.

Sure, but probably a useful one. I've had complaints from firmware 
vendors that we're not handling the timezone properly here.

> > What are the expected semantics for get_wallclock?
> 
> Not sure - I think both are permitted (just like for the legacy RTC),
> with the expectation that early user mode would tell the kernel.

Yeah. I think get_time and set_time should probably both be paying 
attention to sys_tz and converting appropriately.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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