perf/x86/intel/pt: Annotate 'pt_cap_group' with __ro_after_init
'pt_cap_group' is written to in pt_pmu_hw_init() and not modified after. This makes it a suitable candidate for annotating as __ro_after_init. Signed-off-by: NZubin Mithra <zsm@chromium.org> Reviewed-by: NGuenter Roeck <groeck@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: keescook@chromium.org Link: http://lkml.kernel.org/r/20180912164510.23444-1-zsm@chromium.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
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