Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "11 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  scripts/spdxcheck.py: always open files in binary mode
  checkstack.pl: fix for aarch64
  userfaultfd: check VM_MAYWRITE was set after verifying the uffd is registered
  fs/iomap.c: get/put the page in iomap_page_create/release()
  hugetlbfs: call VM_BUG_ON_PAGE earlier in free_huge_page()
  memblock: annotate memblock_is_reserved() with __init_memblock
  psi: fix reference to kernel commandline enable
  arch/sh/include/asm/io.h: provide prototypes for PCI I/O mapping in asm/io.h
  mm/sparse: add common helper to mark all memblocks present
  mm: introduce common STRUCT_PAGE_MAX_SHIFT define
  alpha: fix hang caused by the bootmem removal

16 files changed, 54 insertions, 30 deletions

diff --git a/arch/alpha/kernel/setup.c b/arch/alpha/kernel/setup.c
index a37fd990bd55..4b5b1b244f86 100644
--- a/arch/alpha/kernel/setup.c
+++ b/arch/alpha/kernel/setup.c
@@ -634,6 +634,7 @@ setup_arch(char **cmdline_p)
 
         /* Find our memory.  */
         setup_memory(kernel_end);
+        memblock_set_bottom_up(true);
 
         /* First guess at cpu cache sizes.  Do this before init_arch.  */
         determine_cpu_caches(cpu->type);
diff --git a/arch/alpha/mm/numa.c b/arch/alpha/mm/numa.c
index 74846553e3f1..d0b73371e985 100644
--- a/arch/alpha/mm/numa.c
+++ b/arch/alpha/mm/numa.c
@@ -144,14 +144,14 @@ setup_memory_node(int nid, void *kernel_end)
         if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
                 panic("kernel loaded out of ram");
 
+        memblock_add(PFN_PHYS(node_min_pfn),
+                     (node_max_pfn - node_min_pfn) << PAGE_SHIFT);
+
         /* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
            Note that we round this down, not up - node memory
            has much larger alignment than 8Mb, so it's safe. */
         node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
 
-        memblock_add(PFN_PHYS(node_min_pfn),
-                     (node_max_pfn - node_min_pfn) << PAGE_SHIFT);
-
         NODE_DATA(nid)->node_start_pfn = node_min_pfn;
         NODE_DATA(nid)->node_present_pages = node_max_pfn - node_min_pfn;
 
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index b96442960aea..f0a5c9531e8b 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -35,15 +35,6 @@
 #define PCI_IO_SIZE             SZ_16M
 
 /*
- * Log2 of the upper bound of the size of a struct page. Used for sizing
- * the vmemmap region only, does not affect actual memory footprint.
- * We don't use sizeof(struct page) directly since taking its size here
- * requires its definition to be available at this point in the inclusion
- * chain, and it may not be a power of 2 in the first place.
- */
-#define STRUCT_PAGE_MAX_SHIFT   6
-
-/*
  * VMEMMAP_SIZE - allows the whole linear region to be covered by
  *                a struct page array
  */
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 9b432d9fcada..0340e45655c6 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -610,14 +610,6 @@ void __init mem_init(void)
         BUILD_BUG_ON(TASK_SIZE_32                       > TASK_SIZE_64);
 #endif
 
-#ifdef CONFIG_SPARSEMEM_VMEMMAP
-        /*
-         * Make sure we chose the upper bound of sizeof(struct page)
-         * correctly when sizing the VMEMMAP array.
-         */
-        BUILD_BUG_ON(sizeof(struct page) > (1 << STRUCT_PAGE_MAX_SHIFT));
-#endif
-
         if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
                 extern int sysctl_overcommit_memory;
                 /*
diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index 98cb8c802b1a..4f7f235f15f8 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -24,6 +24,7 @@
 #define __IO_PREFIX     generic
 #include <asm/io_generic.h>
 #include <asm/io_trapped.h>
+#include <asm-generic/pci_iomap.h>
 #include <mach/mangle-port.h>
 
 #define __raw_writeb(v,a)       (__chk_io_ptr(a), *(volatile u8  __force *)(a) = (v))
diff --git a/fs/iomap.c b/fs/iomap.c
index d6bc98ae8d35..5bc172f3dfe8 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -116,6 +116,12 @@ iomap_page_create(struct inode *inode, struct page *page)
         atomic_set(&iop->read_count, 0);
         atomic_set(&iop->write_count, 0);
         bitmap_zero(iop->uptodate, PAGE_SIZE / SECTOR_SIZE);
+
+        /*
+         * migrate_page_move_mapping() assumes that pages with private data have
+         * their count elevated by 1.
+         */
+        get_page(page);
         set_page_private(page, (unsigned long)iop);
         SetPagePrivate(page);
         return iop;
@@ -132,6 +138,7 @@ iomap_page_release(struct page *page)
         WARN_ON_ONCE(atomic_read(&iop->write_count));
         ClearPagePrivate(page);
         set_page_private(page, 0);
+        put_page(page);
         kfree(iop);
 }
 
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c
index cd58939dc977..7a85e609fc27 100644
--- a/fs/userfaultfd.c
+++ b/fs/userfaultfd.c
@@ -1566,7 +1566,6 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
                 cond_resched();
 
                 BUG_ON(!vma_can_userfault(vma));
-                WARN_ON(!(vma->vm_flags & VM_MAYWRITE));
 
                 /*
                  * Nothing to do: this vma is already registered into this
@@ -1575,6 +1574,8 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx,
                 if (!vma->vm_userfaultfd_ctx.ctx)
                         goto skip;
 
+                WARN_ON(!(vma->vm_flags & VM_MAYWRITE));
+
                 if (vma->vm_start > start)
                         start = vma->vm_start;
                 vma_end = min(end, vma->vm_end);
diff --git a/include/asm-generic/fixmap.h b/include/asm-generic/fixmap.h
index 827e4d3bbc7a..8cc7b09c1bc7 100644
--- a/include/asm-generic/fixmap.h
+++ b/include/asm-generic/fixmap.h
@@ -16,6 +16,7 @@
 #define __ASM_GENERIC_FIXMAP_H
 
 #include <linux/bug.h>
+#include <linux/mm_types.h>
 
 #define __fix_to_virt(x)        (FIXADDR_TOP - ((x) << PAGE_SHIFT))
 #define __virt_to_fix(x)        ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 5ed8f6292a53..2c471a2c43fa 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -206,6 +206,11 @@ struct page {
 #endif
 } _struct_page_alignment;
 
+/*
+ * Used for sizing the vmemmap region on some architectures
+ */
+#define STRUCT_PAGE_MAX_SHIFT   (order_base_2(sizeof(struct page)))
+
 #define PAGE_FRAG_CACHE_MAX_SIZE        __ALIGN_MASK(32768, ~PAGE_MASK)
 #define PAGE_FRAG_CACHE_MAX_ORDER       get_order(PAGE_FRAG_CACHE_MAX_SIZE)
 
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 847705a6d0ec..db023a92f3a4 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -783,6 +783,12 @@ void memory_present(int nid, unsigned long start, unsigned long end);
 static inline void memory_present(int nid, unsigned long start, unsigned long end) {}
 #endif
 
+#if defined(CONFIG_SPARSEMEM)
+void memblocks_present(void);
+#else
+static inline void memblocks_present(void) {}
+#endif
+
 #ifdef CONFIG_HAVE_MEMORYLESS_NODES
 int local_memory_node(int node_id);
 #else
diff --git a/init/Kconfig b/init/Kconfig
index cf5b5a0dcbc2..ed9352513c32 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -515,8 +515,8 @@ config PSI_DEFAULT_DISABLED
         depends on PSI
         help
           If set, pressure stall information tracking will be disabled
-          per default but can be enabled through passing psi_enable=1
-          on the kernel commandline during boot.
+          per default but can be enabled through passing psi=1 on the
+          kernel commandline during boot.
 
 endmenu # "CPU/Task time and stats accounting"
 
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 705a3e9cc910..a80832487981 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1248,10 +1248,11 @@ void free_huge_page(struct page *page)
                 (struct hugepage_subpool *)page_private(page);
         bool restore_reserve;
 
-        set_page_private(page, 0);
-        page->mapping = NULL;
         VM_BUG_ON_PAGE(page_count(page), page);
         VM_BUG_ON_PAGE(page_mapcount(page), page);
+
+        set_page_private(page, 0);
+        page->mapping = NULL;
         restore_reserve = PagePrivate(page);
         ClearPagePrivate(page);
 
diff --git a/mm/memblock.c b/mm/memblock.c
index 9a2d5ae81ae1..81ae63ca78d0 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1727,7 +1727,7 @@ static int __init_memblock memblock_search(struct memblock_type *type, phys_addr
         return -1;
 }
 
-bool __init memblock_is_reserved(phys_addr_t addr)
+bool __init_memblock memblock_is_reserved(phys_addr_t addr)
 {
         return memblock_search(&memblock.reserved, addr) != -1;
 }
diff --git a/mm/sparse.c b/mm/sparse.c
index 33307fc05c4d..3abc8cc50201 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -240,6 +240,22 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
 }
 
 /*
+ * Mark all memblocks as present using memory_present(). This is a
+ * convienence function that is useful for a number of arches
+ * to mark all of the systems memory as present during initialization.
+ */
+void __init memblocks_present(void)
+{
+        struct memblock_region *reg;
+
+        for_each_memblock(memory, reg) {
+                memory_present(memblock_get_region_node(reg),
+                               memblock_region_memory_base_pfn(reg),
+                               memblock_region_memory_end_pfn(reg));
+        }
+}
+
+/*
  * Subtle, we encode the real pfn into the mem_map such that
  * the identity pfn - section_mem_map will return the actual
  * physical page frame number.
diff --git a/scripts/checkstack.pl b/scripts/checkstack.pl
index 8081b6cf67d2..34414c6efad6 100755
--- a/scripts/checkstack.pl
+++ b/scripts/checkstack.pl
@@ -47,8 +47,8 @@ my (@stack, $re, $dre, $x, $xs, $funcre);
         $xs     = "[0-9a-f ]";  # hex character or space
         $funcre = qr/^$x* <(.*)>:$/;
         if ($arch eq 'aarch64') {
-                #ffffffc0006325cc:       a9bb7bfd        stp     x29, x30, [sp,#-80]!
-                $re = qr/^.*stp.*sp,\#-([0-9]{1,8})\]\!/o;
+                #ffffffc0006325cc:       a9bb7bfd        stp     x29, x30, [sp, #-80]!
+                $re = qr/^.*stp.*sp, \#-([0-9]{1,8})\]\!/o;
         } elsif ($arch eq 'arm') {
                 #c0008ffc:      e24dd064        sub     sp, sp, #100    ; 0x64
                 $re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
diff --git a/scripts/spdxcheck.py b/scripts/spdxcheck.py
index 5056fb3b897d..e559c6294c39 100755
--- a/scripts/spdxcheck.py
+++ b/scripts/spdxcheck.py
@@ -168,6 +168,7 @@ class id_parser(object):
         self.curline = 0
         try:
             for line in fd:
+                line = line.decode(locale.getpreferredencoding(False), errors='ignore')
                 self.curline += 1
                 if self.curline > maxlines:
                     break
@@ -249,12 +250,13 @@ if __name__ == '__main__':
 
     try:
         if len(args.path) and args.path[0] == '-':
-            parser.parse_lines(sys.stdin, args.maxlines, '-')
+            stdin = os.fdopen(sys.stdin.fileno(), 'rb')
+            parser.parse_lines(stdin, args.maxlines, '-')
         else:
             if args.path:
                 for p in args.path:
                     if os.path.isfile(p):
-                        parser.parse_lines(open(p), args.maxlines, p)
+                        parser.parse_lines(open(p, 'rb'), args.maxlines, p)
                     elif os.path.isdir(p):
                         scan_git_subtree(repo.head.reference.commit.tree, p)
                     else: