linux-kernel - Re: [Regression] "x86-64/efi: Use EFI to deal with platform wall clock" prevents my machine from booting

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Message-ID: <20120806223208.5301be0d@zougloub.eu>
Date:	Mon, 6 Aug 2012 22:32:08 -0400
From:	Jérôme Carretero <cJ-ko@...gloub.eu>
To:	"Jan Beulich" <JBeulich@...e.com>
Cc:	"Matthew Garrett" <mjg59@...f.ucam.org>,
	"Ingo Molnar" <mingo@...nel.org>,
	"Matt Fleming" <matt.fleming@...ux.intel.com>,
	<linux-efi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [Regression] "x86-64/efi: Use EFI to deal with platform wall
 clock" prevents my machine from booting

On Mon, 6 Aug 2012 09:16:27 -0400
Jérôme Carretero <cJ-ko@...gloub.eu> wrote:

> - I can bisect the patch further down (might be a bit silly because
>   I don't quite understand it),

For troubleshooting purposes I edited over your patch.
So far:

- (in arch/x86/platform/efi/efi.c) when making efi_get_time()
  return mach_get_cmos_time(), the system boots.

- then I tried to return mach_get_cmos_time() when efi.get_time()
  fails, ie. if (status != EFI_SUCCESS).
  The system does not boot: efi.get_time(), aka virt_efi_get_time(),
  does not return.

Maybe I can get more...

-- 
cJ
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