UCONTEXT_BANNABLE
!(pc->user_flags & BIT(UCONTEXT_BANNABLE))) {
pc->user_flags = BIT(UCONTEXT_BANNABLE) |
pc->user_flags |= BIT(UCONTEXT_BANNABLE);
pc->user_flags &= ~BIT(UCONTEXT_BANNABLE);
return test_bit(UCONTEXT_BANNABLE, &ctx->user_flags);
set_bit(UCONTEXT_BANNABLE, &ctx->user_flags);
clear_bit(UCONTEXT_BANNABLE, &ctx->user_flags);