On Tue, 2011-08-09 at 18:35 +0200, Arnd Bergmann wrote:

quoted

+static cycle_t tsc_read(struct clocksource *cs)
+{
+     return get_cycles();
+}

What is this good for? TSC is an x86 specific feature, so you should
just
be able to use get_cycles directly.

TSC (Time Stamp Counter) is how the C6X hardware manuals refer to the
free running 64-bit core clock counter. The tsc_read function is needed
to provide a function with the correct prototype for struct clocksource
read method.

--Mark