From: Tony Lu <zlu@tilera.com>
Date: Mon, 4 Feb 2013 22:28:46 +0000 (-0800)
Subject: mm/hugetlb: set PTE as huge in hugetlb_change_protection and remove_migration_pte
X-Git-Tag: v3.7.7~21
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cf032052de7afcebd9cd0c248de3b46525afba7e;p=thirdparty%2Fkernel%2Fstable.git

mm/hugetlb: set PTE as huge in hugetlb_change_protection and remove_migration_pte

commit be7517d6ab9722f0abad6ba5ffd39cfced95549c upstream.

When setting a huge PTE, besides calling pte_mkhuge(), we also need to
call arch_make_huge_pte(), which we indeed do in make_huge_pte(), but we
forget to do in hugetlb_change_protection() and remove_migration_pte().

Signed-off-by: Zhigang Lu <zlu@tilera.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f198aca5c362e..b969ed4a6f6f1 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3028,6 +3028,7 @@ void hugetlb_change_protection(struct vm_area_struct *vma,
 		if (!huge_pte_none(huge_ptep_get(ptep))) {
 			pte = huge_ptep_get_and_clear(mm, address, ptep);
 			pte = pte_mkhuge(pte_modify(pte, newprot));
+			pte = arch_make_huge_pte(pte, vma, NULL, 0);
 			set_huge_pte_at(mm, address, ptep, pte);
 		}
 	}
diff --git a/mm/migrate.c b/mm/migrate.c
index 77ed2d7737056..346d32d790117 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -143,8 +143,10 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
 	if (is_write_migration_entry(entry))
 		pte = pte_mkwrite(pte);
 #ifdef CONFIG_HUGETLB_PAGE
-	if (PageHuge(new))
+	if (PageHuge(new)) {
 		pte = pte_mkhuge(pte);
+		pte = arch_make_huge_pte(pte, vma, new, 0);
+	}
 #endif
 	flush_cache_page(vma, addr, pte_pfn(pte));
 	set_pte_at(mm, addr, ptep, pte);