s390/cpum_sf: Add helper to read TOD from trailer entries
The trailer entry contains a timestamp of the time when the sample-data-block became full. The timestamp specifies a TOD (time-of-day) value in either the STCK or STCKE format. Provide a helper function to return the TOD value depending on the setting of time format indicator. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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