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