Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits

[Aneesh Kumar K.V]

"Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> writes:
 @@ -168,6 +182,10 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
>  	unsigned long addr = addr0;
>  	struct vm_unmapped_area_info info;
>  
> +	addr = mpx_unmapped_area_check(addr, len, flags);
> +	if (IS_ERR_VALUE(addr))
> +		return addr;
> +
>  	/* requested length too big for entire address space */
>  	if (len > TASK_SIZE)
>  		return -ENOMEM;
> @@ -192,6 +210,14 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
>  	info.length = len;
>  	info.low_limit = PAGE_SIZE;
>  	info.high_limit = mm->mmap_base;
> +
> +	/*
> +	 * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area
> +	 * in the full address space.
> +	 */
> +	if (addr > DEFAULT_MAP_WINDOW)
> +		info.high_limit += TASK_SIZE - DEFAULT_MAP_WINDOW;
> +

Is this ok for 32 bit application ?


>  	info.align_mask = 0;
>  	info.align_offset = pgoff << PAGE_SHIFT;
>  	if (filp) {


-aneesh