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hpet: Drop stale URLs

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Looks like the HPET spec at intel.com got moved.
It isn't hard to find so drop the link, just mention
the revision assumed.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Clemens Ladisch <clemens@ladisch.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-doc@vger.kernel.org
Link: http://lkml.kernel.org/r/1455145462-3877-1-git-send-email-mst@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Michael S. Tsirkin 2016-02-11 01:05:01 +02:00 committed by Ingo Molnar
parent a82eee7424
commit 4e7f9df258
3 changed files with 4 additions and 6 deletions
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4
Documentation/timers/hpet.txt
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@ -1,9 +1,7 @@
High Precision Event Timer Driver for Linux High Precision Event Timer Driver for Linux
The High Precision Event Timer (HPET) hardware follows a specification The High Precision Event Timer (HPET) hardware follows a specification
by Intel and Microsoft which can be found at by Intel and Microsoft, revision 1.
http://www.intel.com/hardwaredesign/hpetspec_1.pdf
Each HPET has one fixed-rate counter (at 10+ MHz, hence "High Precision") Each HPET has one fixed-rate counter (at 10+ MHz, hence "High Precision")
and up to 32 comparators. Normally three or more comparators are provided, and up to 32 comparators. Normally three or more comparators are provided,

4
arch/x86/Kconfig
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@ -778,8 +778,8 @@ config HPET_TIMER
HPET is the next generation timer replacing legacy 8254s. HPET is the next generation timer replacing legacy 8254s.
The HPET provides a stable time base on SMP The HPET provides a stable time base on SMP
systems, unlike the TSC, but it is more expensive to access, systems, unlike the TSC, but it is more expensive to access,
as it is off-chip. You can find the HPET spec at as it is off-chip. The interface used is documented
<http://www.intel.com/hardwaredesign/hpetspec_1.pdf>. in the HPET spec, revision 1.
You can safely choose Y here. However, HPET will only be You can safely choose Y here. However, HPET will only be
activated if the platform and the BIOS support this feature. activated if the platform and the BIOS support this feature.

2
drivers/char/hpet.c
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@ -42,7 +42,7 @@
/* /*
* The High Precision Event Timer driver. * The High Precision Event Timer driver.
* This driver is closely modelled after the rtc.c driver. * This driver is closely modelled after the rtc.c driver.
* http://www.intel.com/hardwaredesign/hpetspec_1.pdf * See HPET spec revision 1.
*/ */
#define HPET_USER_FREQ (64) #define HPET_USER_FREQ (64)
#define HPET_DRIFT (500) #define HPET_DRIFT (500)