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authorPatrick Ohly <patrick.ohly@intel.com>2009-02-12 05:03:35 +0000
committerDavid S. Miller <davem@davemloft.net>2009-02-15 22:43:32 -0800
commita75244c3d519fcb490ca2bf3f123c98017f1e8d0 (patch)
treedee5b6a3589cfaae698a11297667e9e0c8b01ef5 /block
parenta038a353c3de4040d8445ec568acebdac144436f (diff)
timecompare: generic infrastructure to map between two time bases
Mapping from a struct timecounter to a time returned by functions like ktime_get_real() is implemented. This is sufficient to use this code in a network device driver which wants to support hardware time stamping and transformation of hardware time stamps to system time. The interface could have been made more versatile by not depending on a time counter, but this wasn't done to avoid writing glue code elsewhere. The method implemented here is the one used and analyzed under the name "assisted PTP" in the LCI PTP paper: http://www.linuxclustersinstitute.org/conferences/archive/2008/PDF/Ohly_92221.pdf Acked-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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