Re: [PATCHv3 33/33] mm, x86: introduce PR_SET_MAX_VADDR and PR_GET_MAX_VADDR

[Dave Hansen]

Let me make sure I'm grokking what you're trying to do here.

On 02/20/2017 05:15 AM, Kirill A. Shutemov wrote:
> +/* MPX cannot handle addresses above 47-bits yet. */
> +unsigned long mpx_unmapped_area_check(unsigned long addr, unsigned long len,
> +		unsigned long flags)
> +{
> +	if (!kernel_managing_mpx_tables(current->mm))
> +		return addr;
> +	if (addr + len <= DEFAULT_MAP_WINDOW)
> +		return addr;

At this point, we know MPX management is on and the hint is for memory
above DEFAULT_MAP_WINDOW?

> +	if (flags & MAP_FIXED)
> +		return -ENOMEM;

... and if it's a MAP_FIXED request, fail it.

> +	if (len > DEFAULT_MAP_WINDOW)
> +		return -ENOMEM;

What is this case for?  If addr+len wraps?

> +	/* Look for unmap area within DEFAULT_MAP_WINDOW */
> +	return 0;
> +}

Otherwise, blow away the hint, which we know is high and needs to
be discarded?