mm: page_vma_mapped_walk(): add a level of indentation

page_vma_mapped_walk() cleanup: add a level of indentation to much of
the body, making no functional change in this commit, but reducing the
later diff when this is all converted to a loop.

[hughd@google.com: : page_vma_mapped_walk(): add a level of indentation fix]
  Link: https://lkml.kernel.org/r/7f817555-3ce1-c785-e438-87d8efdcaf26@google.com

Link: https://lkml.kernel.org/r/efde211-f3e2-fe54-977-ef481419e7f3@google.comSigned-off-by: NHugh Dickins <hughd@google.com>
Acked-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Wang Yugui <wangyugui@e16-tech.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

mm/page_vma_mapped.c

@@ -173,6 +173,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
 	if (pvmw->pte)
 		goto next_pte;
 restart:
+	{
 		pgd = pgd_offset(mm, pvmw->address);
 		if (!pgd_present(*pgd))
 			return false;
@@ -182,6 +183,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
 		pud = pud_offset(p4d, pvmw->address);
 		if (!pud_present(*pud))
 			return false;
+
 		pvmw->pmd = pmd_offset(pud, pvmw->address);
 		/*
 		 * Make sure the pmd value isn't cached in a register by the
@@ -189,6 +191,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
 		 * subsequent update.
 		 */
 		pmde = READ_ONCE(*pvmw->pmd);
+
 		if (pmd_trans_huge(pmde) || is_pmd_migration_entry(pmde)) {
 			pvmw->ptl = pmd_lock(mm, pvmw->pmd);
 			pmde = *pvmw->pmd;
@@ -220,7 +223,8 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
 			 * cannot return prematurely, while zap_huge_pmd() has
 			 * cleared *pmd but not decremented compound_mapcount().
 			 */
-		if ((pvmw->flags & PVMW_SYNC) && PageTransCompound(page)) {
+			if ((pvmw->flags & PVMW_SYNC) &&
+			    PageTransCompound(page)) {
 				spinlock_t *ptl = pmd_lock(mm, pvmw->pmd);
 
 				spin_unlock(ptl);
@@ -229,6 +233,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
 		}
 		if (!map_pte(pvmw))
 			goto next_pte;
+	}
 	while (1) {
 		unsigned long end;