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

Pull x86 mm updates from Ingo Molnar:
 "This tree includes the following changes:

   - fix memory hotplug
   - fix hibernation bootup memory layout assumptions
   - fix hyperv numa guest kernel messages
   - remove dead code
   - update documentation"

* 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Update memory map description to list hypervisor-reserved area
  x86/mm, hibernate: Do not assume the first e820 area to be RAM
  x86/mm/numa: Drop dead code and rename setup_node_data() to setup_alloc_data()
  x86/mm/hotplug: Modify PGD entry when removing memory
  x86/mm/hotplug: Pass sync_global_pgds() a correct argument in remove_pagetable()
  x86: Remove set_pmd_pfn

10 files changed, 47 insertions, 78 deletions

diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt
index afe68ddbe6a4..052ee643a32e 100644
--- a/Documentation/x86/x86_64/mm.txt
+++ b/Documentation/x86/x86_64/mm.txt
@@ -5,7 +5,7 @@ Virtual memory map with 4 level page tables:
 
 0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm
 hole caused by [48:63] sign extension
-ffff800000000000 - ffff80ffffffffff (=40 bits) guard hole
+ffff800000000000 - ffff87ffffffffff (=43 bits) guard hole, reserved for hypervisor
 ffff880000000000 - ffffc7ffffffffff (=64 TB) direct mapping of all phys. memory
 ffffc80000000000 - ffffc8ffffffffff (=40 bits) hole
 ffffc90000000000 - ffffe8ffffffffff (=45 bits) vmalloc/ioremap space
diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h
index 4064acae625d..01b493e5a99b 100644
--- a/arch/x86/include/asm/numa.h
+++ b/arch/x86/include/asm/numa.h
@@ -9,7 +9,6 @@
 #ifdef CONFIG_NUMA
 
 #define NR_NODE_MEMBLKS         (MAX_NUMNODES*2)
-#define ZONE_ALIGN (1UL << (MAX_ORDER+PAGE_SHIFT))
 
 /*
  * Too small node sizes may confuse the VM badly. Usually they
diff --git a/arch/x86/include/asm/pgtable_32.h b/arch/x86/include/asm/pgtable_32.h
index 9ee322103c6d..b6c0b404898a 100644
--- a/arch/x86/include/asm/pgtable_32.h
+++ b/arch/x86/include/asm/pgtable_32.h
@@ -32,9 +32,6 @@ static inline void pgtable_cache_init(void) { }
 static inline void check_pgt_cache(void) { }
 void paging_init(void);
 
-extern void set_pmd_pfn(unsigned long, unsigned long, pgprot_t);
-
-
 /*
  * Define this if things work differently on an i386 and an i486:
  * it will (on an i486) warn about kernel memory accesses that are
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 3874693c0e53..4572b2f30237 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -116,7 +116,8 @@ static inline void native_pgd_clear(pgd_t *pgd)
         native_set_pgd(pgd, native_make_pgd(0));
 }
 
-extern void sync_global_pgds(unsigned long start, unsigned long end);
+extern void sync_global_pgds(unsigned long start, unsigned long end,
+                             int removed);
 
 /*
  * Conversion functions: convert a page and protection to a page entry,
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index 988c00a1f60d..49f886481615 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -682,15 +682,14 @@ void __init parse_e820_ext(u64 phys_addr, u32 data_len)
  * hibernation (32 bit) or software suspend and suspend to RAM (64 bit).
  *
  * This function requires the e820 map to be sorted and without any
- * overlapping entries and assumes the first e820 area to be RAM.
+ * overlapping entries.
  */
 void __init e820_mark_nosave_regions(unsigned long limit_pfn)
 {
         int i;
-        unsigned long pfn;
+        unsigned long pfn = 0;
 
-        pfn = PFN_DOWN(e820.map[0].addr + e820.map[0].size);
-        for (i = 1; i < e820.nr_map; i++) {
+        for (i = 0; i < e820.nr_map; i++) {
                 struct e820entry *ei = &e820.map[i];
 
                 if (pfn < PFN_UP(ei->addr))
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 9c5b32e2bdc0..d973e61e450d 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -349,7 +349,7 @@ out:
 
 void vmalloc_sync_all(void)
 {
-        sync_global_pgds(VMALLOC_START & PGDIR_MASK, VMALLOC_END);
+        sync_global_pgds(VMALLOC_START & PGDIR_MASK, VMALLOC_END, 0);
 }
 
 /*
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 5d984769cbd8..4cb8763868fc 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -178,7 +178,7 @@ __setup("noexec32=", nonx32_setup);
  * When memory was added/removed make sure all the processes MM have
  * suitable PGD entries in the local PGD level page.
  */
-void sync_global_pgds(unsigned long start, unsigned long end)
+void sync_global_pgds(unsigned long start, unsigned long end, int removed)
 {
         unsigned long address;
 
@@ -186,7 +186,12 @@ void sync_global_pgds(unsigned long start, unsigned long end)
                 const pgd_t *pgd_ref = pgd_offset_k(address);
                 struct page *page;
 
-                if (pgd_none(*pgd_ref))
+                /*
+                 * When it is called after memory hot remove, pgd_none()
+                 * returns true. In this case (removed == 1), we must clear
+                 * the PGD entries in the local PGD level page.
+                 */
+                if (pgd_none(*pgd_ref) && !removed)
                         continue;
 
                 spin_lock(&pgd_lock);
@@ -199,12 +204,18 @@ void sync_global_pgds(unsigned long start, unsigned long end)
                         pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
                         spin_lock(pgt_lock);
 
-                        if (pgd_none(*pgd))
-                                set_pgd(pgd, *pgd_ref);
-                        else
+                        if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
                                 BUG_ON(pgd_page_vaddr(*pgd)
                                        != pgd_page_vaddr(*pgd_ref));
 
+                        if (removed) {
+                                if (pgd_none(*pgd_ref) && !pgd_none(*pgd))
+                                        pgd_clear(pgd);
+                        } else {
+                                if (pgd_none(*pgd))
+                                        set_pgd(pgd, *pgd_ref);
+                        }
+
                         spin_unlock(pgt_lock);
                 }
                 spin_unlock(&pgd_lock);
@@ -633,7 +644,7 @@ kernel_physical_mapping_init(unsigned long start,
         }
 
         if (pgd_changed)
-                sync_global_pgds(addr, end - 1);
+                sync_global_pgds(addr, end - 1, 0);
 
         __flush_tlb_all();
 
@@ -976,25 +987,26 @@ static void __meminit
 remove_pagetable(unsigned long start, unsigned long end, bool direct)
 {
         unsigned long next;
+        unsigned long addr;
         pgd_t *pgd;
         pud_t *pud;
         bool pgd_changed = false;
 
-        for (; start < end; start = next) {
-                next = pgd_addr_end(start, end);
+        for (addr = start; addr < end; addr = next) {
+                next = pgd_addr_end(addr, end);
 
-                pgd = pgd_offset_k(start);
+                pgd = pgd_offset_k(addr);
                 if (!pgd_present(*pgd))
                         continue;
 
                 pud = (pud_t *)pgd_page_vaddr(*pgd);
-                remove_pud_table(pud, start, next, direct);
+                remove_pud_table(pud, addr, next, direct);
                 if (free_pud_table(pud, pgd))
                         pgd_changed = true;
         }
 
         if (pgd_changed)
-                sync_global_pgds(start, end - 1);
+                sync_global_pgds(start, end - 1, 1);
 
         flush_tlb_all();
 }
@@ -1341,7 +1353,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
         else
                 err = vmemmap_populate_basepages(start, end, node);
         if (!err)
-                sync_global_pgds(start, end - 1);
+                sync_global_pgds(start, end - 1, 0);
         return err;
 }
 
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index a32b706c401a..d221374d5ce8 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -185,8 +185,8 @@ int __init numa_add_memblk(int nid, u64 start, u64 end)
         return numa_add_memblk_to(nid, start, end, &numa_meminfo);
 }
 
-/* Initialize NODE_DATA for a node on the local memory */
-static void __init setup_node_data(int nid, u64 start, u64 end)
+/* Allocate NODE_DATA for a node on the local memory */
+static void __init alloc_node_data(int nid)
 {
         const size_t nd_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
         u64 nd_pa;
@@ -194,18 +194,6 @@ static void __init setup_node_data(int nid, u64 start, u64 end)
         int tnid;
 
         /*
-         * Don't confuse VM with a node that doesn't have the
-         * minimum amount of memory:
-         */
-        if (end && (end - start) < NODE_MIN_SIZE)
-                return;
-
-        start = roundup(start, ZONE_ALIGN);
-
-        printk(KERN_INFO "Initmem setup node %d [mem %#010Lx-%#010Lx]\n",
-               nid, start, end - 1);
-
-        /*
          * Allocate node data.  Try node-local memory and then any node.
          * Never allocate in DMA zone.
          */
@@ -222,7 +210,7 @@ static void __init setup_node_data(int nid, u64 start, u64 end)
         nd = __va(nd_pa);
 
         /* report and initialize */
-        printk(KERN_INFO "  NODE_DATA [mem %#010Lx-%#010Lx]\n",
+        printk(KERN_INFO "NODE_DATA(%d) allocated [mem %#010Lx-%#010Lx]\n", nid,
                nd_pa, nd_pa + nd_size - 1);
         tnid = early_pfn_to_nid(nd_pa >> PAGE_SHIFT);
         if (tnid != nid)
@@ -230,9 +218,6 @@ static void __init setup_node_data(int nid, u64 start, u64 end)
 
         node_data[nid] = nd;
         memset(NODE_DATA(nid), 0, sizeof(pg_data_t));
-        NODE_DATA(nid)->node_id = nid;
-        NODE_DATA(nid)->node_start_pfn = start >> PAGE_SHIFT;
-        NODE_DATA(nid)->node_spanned_pages = (end - start) >> PAGE_SHIFT;
 
         node_set_online(nid);
 }
@@ -523,8 +508,17 @@ static int __init numa_register_memblks(struct numa_meminfo *mi)
                         end = max(mi->blk[i].end, end);
                 }
 
-                if (start < end)
-                        setup_node_data(nid, start, end);
+                if (start >= end)
+                        continue;
+
+                /*
+                 * Don't confuse VM with a node that doesn't have the
+                 * minimum amount of memory:
+                 */
+                if (end && (end - start) < NODE_MIN_SIZE)
+                        continue;
+
+                alloc_node_data(nid);
         }
 
         /* Dump memblock with node info and return. */
diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c
index 4dd8cf652579..75cc0978d45d 100644
--- a/arch/x86/mm/pgtable_32.c
+++ b/arch/x86/mm/pgtable_32.c
@@ -59,41 +59,6 @@ void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
         __flush_tlb_one(vaddr);
 }
 
-/*
- * Associate a large virtual page frame with a given physical page frame 
- * and protection flags for that frame. pfn is for the base of the page,
- * vaddr is what the page gets mapped to - both must be properly aligned. 
- * The pmd must already be instantiated. Assumes PAE mode.
- */ 
-void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
-{
-        pgd_t *pgd;
-        pud_t *pud;
-        pmd_t *pmd;
-
-        if (vaddr & (PMD_SIZE-1)) {             /* vaddr is misaligned */
-                printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n");
-                return; /* BUG(); */
-        }
-        if (pfn & (PTRS_PER_PTE-1)) {           /* pfn is misaligned */
-                printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n");
-                return; /* BUG(); */
-        }
-        pgd = swapper_pg_dir + pgd_index(vaddr);
-        if (pgd_none(*pgd)) {
-                printk(KERN_WARNING "set_pmd_pfn: pgd_none\n");
-                return; /* BUG(); */
-        }
-        pud = pud_offset(pgd, vaddr);
-        pmd = pmd_offset(pud, vaddr);
-        set_pmd(pmd, pfn_pmd(pfn, flags));
-        /*
-         * It's enough to flush this one mapping.
-         * (PGE mappings get flushed as well)
-         */
-        __flush_tlb_one(vaddr);
-}
-
 unsigned long __FIXADDR_TOP = 0xfffff000;
 EXPORT_SYMBOL(__FIXADDR_TOP);
 
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c9710c9bbee2..736d8e1b6381 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4971,6 +4971,8 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
         pgdat->node_start_pfn = node_start_pfn;
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
         get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
+        printk(KERN_INFO "Initmem setup node %d [mem %#010Lx-%#010Lx]\n", nid,
+                        (u64) start_pfn << PAGE_SHIFT, (u64) (end_pfn << PAGE_SHIFT) - 1);
 #endif
         calculate_node_totalpages(pgdat, start_pfn, end_pfn,
                                   zones_size, zholes_size);