On Thu, Jul 19, 2018 at 2:21 PM Peter Zijlstra <[email protected]> wrote: > --- a/include/uapi/linux/perf_event.h > +++ b/include/uapi/linux/perf_event.h > @@ -143,6 +143,8 @@ enum perf_event_sample_format { > PERF_SAMPLE_PHYS_ADDR = 1U << 19, > > PERF_SAMPLE_MAX = 1U << 20, /* non-ABI */ > + > + __PERF_SAMPLE_CALLCHAIN_EARLY = 1UL << 63, > };
The above change makes sparse unhappy :-( Sparse reports the following complaint about __PERF_SAMPLE_CALLCHAIN_EARLY: ./include/uapi/linux/perf_event.h:147:56: warning: cast truncates bits from constant value (8000000000000000 becomes 0) Is the above change portable? Isn't a compiler allowed to use 'int' to represent an enumeration type? Fubo.
