tree 60cc83cf949d6e598e6dc80dc668aebd42c65540
parent a8a11f06973fa63ad692a8f97694cb5eeb70b3f3
author Rusty Russell <rusty@rustcorp.com.au> 1185507772 +1000
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1185677673 -0700

Provide timespec to guests rather than jiffies clock.

A non-periodic clock_event_device and the "jiffies" clock don't mix well:
tick_handle_periodic() can go into an infinite loop.

Currently lguest guests use the jiffies clock when the TSC is
unusable.  Instead, make the Host write the current time into the lguest
page on every interrupt.  This doesn't cost much but is more precise
and at least as accurate as the jiffies clock.  It also gets rid of
the GET_WALLCLOCK hypercall.

Also, delay setting sched_clock until our clock is set up, otherwise
the early printk timestamps can go backwards (not harmful, just ugly).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>