linux-kernel - Re: [PATCH 09/11] x86, mpx: on-demand kernel allocation of bounds tables

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Date:	Fri, 14 Nov 2014 17:47:19 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Dave Hansen <dave@...1.net>
cc:	hpa@...or.com, mingo@...hat.com, x86@...nel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linux-ia64@...r.kernel.org, linux-mips@...ux-mips.org,
	qiaowei.ren@...el.com, dave.hansen@...ux.intel.com
Subject: Re: [PATCH 09/11] x86, mpx: on-demand kernel allocation of bounds
 tables

On Fri, 14 Nov 2014, Dave Hansen wrote:
>  * move mm init-time #ifdef to mpx.h

> +static inline void arch_bprm_mm_init(struct mm_struct *mm,
> +		struct vm_area_struct *vma)
> +{
> +	mpx_mm_init(mm);
> +#ifdef CONFIG_X86_INTEL_MPX
> +	mm->bd_addr = MPX_INVALID_BOUNDS_DIR;
> +#endif

So we have a double init now :)

> +++ b/arch/x86/kernel/setup.c	2014-11-14 07:06:23.941684394 -0800
> @@ -959,6 +959,13 @@ void __init setup_arch(char **cmdline_p)
>  	init_mm.end_code = (unsigned long) _etext;
>  	init_mm.end_data = (unsigned long) _edata;
>  	init_mm.brk = _brk_end;
> +#ifdef CONFIG_X86_INTEL_MPX
> +	/*
> +	 * NULL is theoretically a valid place to put the bounds
> +	 * directory, so point this at an invalid address.
> +	 */
> +	init_mm.bd_addr = MPX_INVALID_BOUNDS_DIR;
> +#endif

And this one wants mpx_mm_init() replacement as well.
  
Thanks,

	tglx
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