valid_user_frame 1809 arch/sparc/kernel/perf_event.c if (!valid_user_frame(usf, sizeof(sf))) valid_user_frame 2450 arch/x86/events/core.c if (!valid_user_frame(fp, sizeof(frame))) valid_user_frame 2508 arch/x86/events/core.c if (!valid_user_frame(fp, sizeof(frame)))