Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "Misc fixes:

   - two boot crash fixes
   - unwinder fixes
   - kexec related kernel direct mappings enhancements/fixes
   - more Clang support quirks
   - minor cleanups
   - Documentation fixes"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/intel_rdt: Fix a typo in Documentation
  x86/build: Don't add -maccumulate-outgoing-args w/o compiler support
  x86/boot/32: Fix UP boot on Quark and possibly other platforms
  x86/mm/32: Set the '__vmalloc_start_set' flag in initmem_init()
  x86/kexec/64: Use gbpages for identity mappings if available
  x86/mm: Add support for gbpages to kernel_ident_mapping_init()
  x86/boot: Declare error() as noreturn
  x86/mm/kaslr: Use the _ASM_MUL macro for multiplication to work around Clang incompatibility
  x86/mm: Fix boot crash caused by incorrect loop count calculation in sync_global_pgds()
  x86/asm: Don't use RBP as a temporary register in csum_partial_copy_generic()
  x86/microcode/AMD: Remove redundant NULL check on mc

3 files changed, 20 insertions, 7 deletions

diff --git a/arch/x86/mm/ident_map.c b/arch/x86/mm/ident_map.c
index 04210a29dd60..adab1595f4bd 100644
--- a/arch/x86/mm/ident_map.c
+++ b/arch/x86/mm/ident_map.c
@@ -13,7 +13,7 @@ static void ident_pmd_init(struct x86_mapping_info *info, pmd_t *pmd_page,
 		if (pmd_present(*pmd))
 			continue;
 
-		set_pmd(pmd, __pmd((addr - info->offset) | info->pmd_flag));
+		set_pmd(pmd, __pmd((addr - info->offset) | info->page_flag));
 	}
 }
 
@@ -30,6 +30,18 @@ static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page,
 		if (next > end)
 			next = end;
 
+		if (info->direct_gbpages) {
+			pud_t pudval;
+
+			if (pud_present(*pud))
+				continue;
+
+			addr &= PUD_MASK;
+			pudval = __pud((addr - info->offset) | info->page_flag);
+			set_pud(pud, pudval);
+			continue;
+		}
+
 		if (pud_present(*pud)) {
 			pmd = pmd_offset(pud, 0);
 			ident_pmd_init(info, pmd, addr, next);
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 41270b96403d..95651dc58e09 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -94,10 +94,10 @@ __setup("noexec32=", nonx32_setup);
  */
 void sync_global_pgds(unsigned long start, unsigned long end)
 {
-	unsigned long address;
+	unsigned long addr;
 
-	for (address = start; address <= end; address += PGDIR_SIZE) {
-		pgd_t *pgd_ref = pgd_offset_k(address);
+	for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
+		pgd_t *pgd_ref = pgd_offset_k(addr);
 		const p4d_t *p4d_ref;
 		struct page *page;
 
@@ -106,7 +106,7 @@ void sync_global_pgds(unsigned long start, unsigned long end)
 		 * handle synchonization on p4d level.
 		 */
 		BUILD_BUG_ON(pgd_none(*pgd_ref));
-		p4d_ref = p4d_offset(pgd_ref, address);
+		p4d_ref = p4d_offset(pgd_ref, addr);
 
 		if (p4d_none(*p4d_ref))
 			continue;
@@ -117,8 +117,8 @@ void sync_global_pgds(unsigned long start, unsigned long end)
 			p4d_t *p4d;
 			spinlock_t *pgt_lock;
 
-			pgd = (pgd_t *)page_address(page) + pgd_index(address);
-			p4d = p4d_offset(pgd, address);
+			pgd = (pgd_t *)page_address(page) + pgd_index(addr);
+			p4d = p4d_offset(pgd, addr);
 			/* the pgt_lock only for Xen */
 			pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
 			spin_lock(pgt_lock);
diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
index 6b7ce6279133..aca6295350f3 100644
--- a/arch/x86/mm/numa_32.c
+++ b/arch/x86/mm/numa_32.c
@@ -100,5 +100,6 @@ void __init initmem_init(void)
 	printk(KERN_DEBUG "High memory starts at vaddr %08lx\n",
 			(ulong) pfn_to_kaddr(highstart_pfn));
 
+	__vmalloc_start_set = true;
 	setup_bootmem_allocator();
 }