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If user has already enabled profiling support in the kernel (for oprofile, old-style profiling of ftrace) then offer up perfcounters with a y default in interactive kconfig sessions. Still keep it off by default otherwise. Cc: Peter Zijlstra <[email protected]> Cc: Linus Torvalds <[email protected]> Signed-off-by: Ingo Molnar <[email protected]>