perf/core: Assert PERF_EVENT_FLAG_ARCH does not overlap with generic flags

This just ensures that PERF_EVENT_FLAG_ARCH does not overlap with generic
hardware event flags.
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: James Clark <james.clark@arm.com>
Link: https://lkml.kernel.org/r/20220907091924.439193-3-anshuman.khandual@arm.com

include/linux/perf_event.h

@@ -141,6 +141,8 @@ struct hw_perf_event_extra {
 #define PERF_EVENT_FLAG_ARCH			0x000fffff
 #define PERF_EVENT_FLAG_USER_READ_CNT		0x80000000
 
+static_assert((PERF_EVENT_FLAG_USER_READ_CNT & PERF_EVENT_FLAG_ARCH) == 0);
+
 /**
  * struct hw_perf_event - performance event hardware details:
  */