Build issue on arm: undefined reference to `get_cpu_clock'

[Michael Opdenacker <michael.opdenacker@free-electrons.com>]

Hello,

Though the arm platform seems to be supported, fio fails to build on the
arm platform. Other non Intel platforms should also be impacted.

gettime.o: In function `get_cycles_per_usec':
/home/ubuntu/.phoronix-test-suite/installed-tests/fio/fio-1.42/gettime.c:192:
undefined reference to `get_cpu_clock'
/home/ubuntu/.phoronix-test-suite/installed-tests/fio/fio-1.42/gettime.c:199:
undefined reference to `get_cpu_clock'
make: *** [fio] Error 1

Unlike in the fio_gettime, where there is an "#ifdef
ARCH_HAVE_CPU_CLOCK" statement around the calls to get_cpu_clock(),
there are other places where this function is used unconditionally.

The get_cpu_clock function is only defined in
arch/arch-ia64.h
arch/arch-x86.h
arch/arch-x86_64.h

How are other architectures supported? I don't understand fio can
support them without defining the get_cpu_clock() function.

I did my tests on version 1.42, but faced the same issues with the
latest git version.

Thank you in advance.

Cheers,

Michael.

-- 
Michael Opdenacker, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
+ 33 621 604 642