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powerpc: use ATB clock, if it's available
author
Jens Axboe
<axboe@kernel.dk>
Tue, 26 Feb 2013 13:43:02 +0000
(14:43 +0100)
committer
Jens Axboe
<axboe@kernel.dk>
Tue, 26 Feb 2013 13:43:02 +0000
(14:43 +0100)
The ATB is more precise, but we don't know if it's available.
Check by forking off a process that attempts to use it, if
we die with SIGILL, then we know it's not there.
Based on code from Steven Noonan.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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