[LTP] [PATCH 0/3] [Realtime] TSC reading cleanup and enhancements

[Gilles C. <gil...@bu...>]

First patch regroups TSC functions and macros definition into librttest.
Second patch is to have an atomic reading of the 64-bit timebase register
of powerpc64. This new function is only valid if -m64 is used when compiling
the whole testcase suite with a powerpc64.
Thirs patch is a fix to avoid spurious tsc_minus warning.

These patches been tested on a ppc64 machine either with 32 or 64 bit
binaries. (-m64)