xbv 253 arch/x86/kernel/fpu/signal.c static int copy_user_to_fpregs_zeroing(void __user *buf, u64 xbv, int fx_only) xbv 261 arch/x86/kernel/fpu/signal.c u64 init_bv = xfeatures_mask & ~xbv; xbv 264 arch/x86/kernel/fpu/signal.c return copy_user_to_xregs(buf, xbv);