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

From	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits
Date	2017-03-20 06:20 +0100
Message-ID	<tmXTz-8lw-1@gated-at.bofh.it> (permalink)
References	<tkrbr-4j8-5@gated-at.bofh.it> <tkrbr-4j8-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> 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

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Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-03-20 06:20 +0100
  Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above  47-bits "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-24 10:10 +0100
    Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above  47-bits "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> - 2017-03-24 10:20 +0100
      Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above  47-bits "Kirill A. Shutemov" <kirill@shutemov.name> - 2017-03-24 10:40 +0100

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