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mm: hugetlb: use get_page_foll() in follow_hugetlb_page()
get_page_foll() is more optimal and is always safe to use under the PT lock. More so for hugetlbfs as there's no risk of race conditions with split_huge_page regardless of the PT lock. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Tested-by: Khalid Aziz <khalid.aziz@oracle.com> Cc: Pravin Shelar <pshelar@nicira.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Ben Hutchings <bhutchings@solarflare.com> Cc: Christoph Lameter <cl@linux.com> Cc: Johannes Weiner <jweiner@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -3079,7 +3079,7 @@ long follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
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same_page:
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if (pages) {
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pages[i] = mem_map_offset(page, pfn_offset);
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get_page(pages[i]);
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get_page_foll(pages[i]);
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}
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if (vmas)
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