linux-kernel - Re: "double" hpet clocksource && hard freeze [bisected]

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Message-ID: <20070828102709.sybsmvvdw0o8swo4@webmail.df.eu>
Date:	Tue, 28 Aug 2007 10:27:09 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Paolo Ornati <ornati@...twebnet.it>
Cc:	"Luck, Tony" <tony.luck@...el.com>, Bob Picco <bob.picco@...com>,
	john stultz <johnstul@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: "double" hpet clocksource && hard freeze [bisected]

Luck, Tony wrote:
> [...] Given that the hang went away when you applied the earlier patch, I
> conclude that the drivers/char/hpet.c code is the one that got selected when
> you had two "hpet" entries ... and that there is something wrong with that
> code that doesn't work right on x86_64.

Apparently, the 'generic' code was just copied from ia64 and assumes that the
timer is 64 bits.  This is not true with hardware from VIA (even on x86_64).

This patch should make it work (although I'd prefer to set the mask  
dynamically
according to the hardware caps).

--- a/drivers/char/hpet.c	Tue Aug 28 09:42:22 2007
+++ b/drivers/char/hpet.c	Tue Aug 28 10:16:54 2007
@@ -73,7 +73,7 @@
          .name           = "hpet",
          .rating         = 250,
          .read           = read_hpet,
-        .mask           = CLOCKSOURCE_MASK(64),
+        .mask           = CLOCKSOURCE_MASK(32),
          .mult           = 0, /*to be caluclated*/
          .shift          = 10,
          .flags          = CLOCK_SOURCE_IS_CONTINUOUS,


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