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author | neel <neel@FreeBSD.org> | 2010-08-05 04:59:54 +0000 |
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committer | neel <neel@FreeBSD.org> | 2010-08-05 04:59:54 +0000 |
commit | cd9a29536ada23d04ba96d228232cc40fbd1c43b (patch) | |
tree | ca9890e2ed549337f4fc588e892e0e216b9b9f95 /etc | |
parent | 8ab9713b03325ace307a87ca92e91f83e1e682fc (diff) | |
download | FreeBSD-src-cd9a29536ada23d04ba96d228232cc40fbd1c43b.zip FreeBSD-src-cd9a29536ada23d04ba96d228232cc40fbd1c43b.tar.gz |
Fix a race between clock_intr() and tick_ticker() when updating
'counter_upper' and 'counter_lower_last'. The race exists because
interrupts are enabled even though tick_ticker() executes in a
critical section.
Fix a bug in clock_intr() in how it updates the cached values of
'counter_upper' and 'counter_lower_last'. They are updated only
when the COUNT register rolls over. More interestingly it will *never*
update the cached values if 'counter_lower_last' happens to be zero.
Get rid of superfluous critical section in clock_intr(). There is no
reason to do this because clock_intr() executes in hard interrupt
context.
Switch back to using 'tick_ticker()' as the cpu ticker for Sibyte.
Reviewed by: jmallett, mav
Diffstat (limited to 'etc')
0 files changed, 0 insertions, 0 deletions