Re: [RFC PATCH v2 17/27] x86/cet/shstk: User-mode shadow stack support

[Peter Zijlstra]

On Tue, Jul 10, 2018 at 03:26:29PM -0700, Yu-cheng Yu wrote:
> +struct cet_status {
> +	unsigned long	shstk_base;
> +	unsigned long	shstk_size;
> +	unsigned int	shstk_enabled:1;
> +};

> @@ -498,6 +499,10 @@ struct thread_struct {
>  	unsigned int		sig_on_uaccess_err:1;
>  	unsigned int		uaccess_err:1;	/* uaccess failed */
>  
> +#ifdef CONFIG_X86_INTEL_CET
> +	struct cet_status	cet;
> +#endif
> +
>  	/* Floating point and extended processor state */
>  	struct fpu		fpu;
>  	/*

Why does that need a structure? That avoids folding the bitfields.