Merge branch 'akpm' (patches from Andrew)

Merge yet more updates from Andrew Morton:

 - More MM work. 100ish more to go. Mike Rapoport's "mm: remove
   __ARCH_HAS_5LEVEL_HACK" series should fix the current ppc issue

 - Various other little subsystems

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (127 commits)
  lib/ubsan.c: fix gcc-10 warnings
  tools/testing/selftests/vm: remove duplicate headers
  selftests: vm: pkeys: fix multilib builds for x86
  selftests: vm: pkeys: use the correct page size on powerpc
  selftests/vm/pkeys: override access right definitions on powerpc
  selftests/vm/pkeys: test correct behaviour of pkey-0
  selftests/vm/pkeys: introduce a sub-page allocator
  selftests/vm/pkeys: detect write violation on a mapped access-denied-key page
  selftests/vm/pkeys: associate key on a mapped page and detect write violation
  selftests/vm/pkeys: associate key on a mapped page and detect access violation
  selftests/vm/pkeys: improve checks to determine pkey support
  selftests/vm/pkeys: fix assertion in test_pkey_alloc_exhaust()
  selftests/vm/pkeys: fix number of reserved powerpc pkeys
  selftests/vm/pkeys: introduce powerpc support
  selftests/vm/pkeys: introduce generic pkey abstractions
  selftests: vm: pkeys: use the correct huge page size
  selftests/vm/pkeys: fix alloc_random_pkey() to make it really random
  selftests/vm/pkeys: fix assertion in pkey_disable_set/clear()
  selftests/vm/pkeys: fix pkey_disable_clear()
  selftests: vm: pkeys: add helpers for pkey bits
  ...

1 files changed, 24 insertions, 4 deletions

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index d637b4ea3147..ca760f6cb18f 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -208,6 +208,7 @@ static struct page * __init
 put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot)
 {
 	pgd_t *pgd;
+	p4d_t *p4d;
 	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
@@ -215,7 +216,10 @@ put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot)
 	pgd = pgd_offset_k(address);		/* note: this is NOT pgd_offset()! */
 
 	{
-		pud = pud_alloc(&init_mm, pgd, address);
+		p4d = p4d_alloc(&init_mm, pgd, address);
+		if (!p4d)
+			goto out;
+		pud = pud_alloc(&init_mm, p4d, address);
 		if (!pud)
 			goto out;
 		pmd = pmd_alloc(&init_mm, pud, address);
@@ -382,6 +386,7 @@ int vmemmap_find_next_valid_pfn(int node, int i)
 
 	do {
 		pgd_t *pgd;
+		p4d_t *p4d;
 		pud_t *pud;
 		pmd_t *pmd;
 		pte_t *pte;
@@ -392,7 +397,13 @@ int vmemmap_find_next_valid_pfn(int node, int i)
 			continue;
 		}
 
-		pud = pud_offset(pgd, end_address);
+		p4d = p4d_offset(pgd, end_address);
+		if (p4d_none(*p4d)) {
+			end_address += P4D_SIZE;
+			continue;
+		}
+
+		pud = pud_offset(p4d, end_address);
 		if (pud_none(*pud)) {
 			end_address += PUD_SIZE;
 			continue;
@@ -430,6 +441,7 @@ int __init create_mem_map_page_table(u64 start, u64 end, void *arg)
 	struct page *map_start, *map_end;
 	int node;
 	pgd_t *pgd;
+	p4d_t *p4d;
 	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
@@ -444,12 +456,20 @@ int __init create_mem_map_page_table(u64 start, u64 end, void *arg)
 	for (address = start_page; address < end_page; address += PAGE_SIZE) {
 		pgd = pgd_offset_k(address);
 		if (pgd_none(*pgd)) {
+			p4d = memblock_alloc_node(PAGE_SIZE, PAGE_SIZE, node);
+			if (!p4d)
+				goto err_alloc;
+			pgd_populate(&init_mm, pgd, p4d);
+		}
+		p4d = p4d_offset(pgd, address);
+
+		if (p4d_none(*p4d)) {
 			pud = memblock_alloc_node(PAGE_SIZE, PAGE_SIZE, node);
 			if (!pud)
 				goto err_alloc;
-			pgd_populate(&init_mm, pgd, pud);
+			p4d_populate(&init_mm, p4d, pud);
 		}
-		pud = pud_offset(pgd, address);
+		pud = pud_offset(p4d, address);
 
 		if (pud_none(*pud)) {
 			pmd = memblock_alloc_node(PAGE_SIZE, PAGE_SIZE, node);