Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - a few hot fixes

 - ocfs2 updates

 - almost all of -mm (slab-generic, slab, slub, kmemleak, kasan,
   cleanups, debug, pagecache, memcg, gup, pagemap, memory-hotplug,
   sparsemem, vmalloc, initialization, z3fold, compaction, mempolicy,
   oom-kill, hugetlb, migration, thp, mmap, madvise, shmem, zswap,
   zsmalloc)

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (132 commits)
  mm/zsmalloc.c: fix a -Wunused-function warning
  zswap: do not map same object twice
  zswap: use movable memory if zpool support allocate movable memory
  zpool: add malloc_support_movable to zpool_driver
  shmem: fix obsolete comment in shmem_getpage_gfp()
  mm/madvise: reduce code duplication in error handling paths
  mm: mmap: increase sockets maximum memory size pgoff for 32bits
  mm/mmap.c: refine find_vma_prev() with rb_last()
  riscv: make mmap allocation top-down by default
  mips: use generic mmap top-down layout and brk randomization
  mips: replace arch specific way to determine 32bit task with generic version
  mips: adjust brk randomization offset to fit generic version
  mips: use STACK_TOP when computing mmap base address
  mips: properly account for stack randomization and stack guard gap
  arm: use generic mmap top-down layout and brk randomization
  arm: use STACK_TOP when computing mmap base address
  arm: properly account for stack randomization and stack guard gap
  arm64, mm: make randomization selected by generic topdown mmap layout
  arm64, mm: move generic mmap layout functions to mm
  arm64: consider stack randomization for mmap base only when necessary
  ...

1 files changed, 17 insertions, 8 deletions

diff --git a/mm/sparse.c b/mm/sparse.c
index 72f010d9bff5..bf32de9e666b 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -11,6 +11,8 @@
 #include <linux/export.h>
 #include <linux/spinlock.h>
 #include <linux/vmalloc.h>
+#include <linux/swap.h>
+#include <linux/swapops.h>
 
 #include "internal.h"
 #include <asm/dma.h>
@@ -470,6 +472,12 @@ struct page __init *__populate_section_memmap(unsigned long pfn,
 static void *sparsemap_buf __meminitdata;
 static void *sparsemap_buf_end __meminitdata;
 
+static inline void __meminit sparse_buffer_free(unsigned long size)
+{
+        WARN_ON(!sparsemap_buf || size == 0);
+        memblock_free_early(__pa(sparsemap_buf), size);
+}
+
 static void __init sparse_buffer_init(unsigned long size, int nid)
 {
         phys_addr_t addr = __pa(MAX_DMA_ADDRESS);
@@ -486,7 +494,7 @@ static void __init sparse_buffer_fini(void)
         unsigned long size = sparsemap_buf_end - sparsemap_buf;
 
         if (sparsemap_buf && size > 0)
-                memblock_free_early(__pa(sparsemap_buf), size);
+                sparse_buffer_free(size);
         sparsemap_buf = NULL;
 }
 
@@ -495,11 +503,15 @@ void * __meminit sparse_buffer_alloc(unsigned long size)
         void *ptr = NULL;
 
         if (sparsemap_buf) {
-                ptr = PTR_ALIGN(sparsemap_buf, size);
+                ptr = (void *) roundup((unsigned long)sparsemap_buf, size);
                 if (ptr + size > sparsemap_buf_end)
                         ptr = NULL;
-                else
+                else {
+                        /* Free redundant aligned space */
+                        if ((unsigned long)(ptr - sparsemap_buf) > 0)
+                                sparse_buffer_free((unsigned long)(ptr - sparsemap_buf));
                         sparsemap_buf = ptr + size;
+                }
         }
         return ptr;
 }
@@ -867,7 +879,7 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn,
          */
         page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages);
 
-        ms = __pfn_to_section(start_pfn);
+        ms = __nr_to_section(section_nr);
         set_section_nid(section_nr, nid);
         section_mark_present(ms);
 
@@ -884,9 +896,6 @@ static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
 {
         int i;
 
-        if (!memmap)
-                return;
-
         /*
          * A further optimization is to have per section refcounted
          * num_poisoned_pages.  But that would need more space per memmap, so
@@ -898,7 +907,7 @@ static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
 
         for (i = 0; i < nr_pages; i++) {
                 if (PageHWPoison(&memmap[i])) {
-                        atomic_long_sub(1, &num_poisoned_pages);
+                        num_poisoned_pages_dec();
                         ClearPageHWPoison(&memmap[i]);
                 }
         }