[ARM] Fix freeing of page tables for ARM in free_pgd_slow

Since 2f569afd (CONFIG_HIGHPTE vs. sub-page page tables.) pte_free() calls
pte_lock_deinit() and dec_zone_page_state().  So free_pgd_slow must not call
the latter two when calling the first.
Signed-off-by: NUwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/pgd.c

@@ -75,7 +75,7 @@ pgd_t *get_pgd_slow(struct mm_struct *mm)
 void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd)
 {
 	pmd_t *pmd;
-	struct page *pte;
+	pgtable_t pte;
 
 	if (!pgd)
 		return;
@@ -90,10 +90,8 @@ void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd)
 		goto free;
 	}
 
-	pte = pmd_page(*pmd);
+	pte = pmd_pgtable(*pmd);
 	pmd_clear(pmd);
-	dec_zone_page_state(virt_to_page((unsigned long *)pgd), NR_PAGETABLE);
-	pte_lock_deinit(pte);
 	pte_free(mm, pte);
 	pmd_free(mm, pmd);
 free: