Messages in this thread | | | Date | Wed, 23 Jul 2008 09:44:36 +0200 | From | Clemens Ladisch <> | Subject | Re: [patch 2.6.26] /dev/hpet - fixes and cleanup |
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David Brownell wrote: > * Tighten and correct the userspace interface code > ... > + only open comparators that have an interrupt, and can thus > perform "real work"
This prevents userspace applications from doing mmap() on /dev/hpet even if there is no interrupt.
This seems to be the only part of the userspace interface that is used in practice. Because of the availability of POSIX timers, it might make sense to deprecate the HPET ioctl interface.
> And re that kernel interface: IMO, worth having a relatively > generic interface for hardware timers instead of inventing a new > interface for each new bit of hardware.
AFAIK it was intended to be similar to the RTC callback interface, but that was before the generic high-precision timer stuff was introduced.
Regards, Clemens
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