clocksource: sanity check sysfs clocksource changes

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Thomas, Andrew and Ingo pointed out that we don't have any safety checks
in the clocksource sysfs entries to make sure sysadmins don't try to
change the clocksource to a non high-res timer capable clocksource (such
as jiffies) when high-res timers (HRT) is enabled.  Doing so will likely
hang a system.

Correct this by filtering non HRT clocksources from available_clocksources
and not accepting non HRT clocksources with HRT enabled.

Signed-off-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

...

This commit is contained in:

john stultz 2009-01-21 22:53:22 -07:00 • committed by Thomas Gleixner

parent 7d27558c41

commit 3f68535ada

3 changed files with 20 additions and 4 deletions

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2

include/linux/hrtimer.h

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4

kernel/hrtimer.c

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18

kernel/time/clocksource.c

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