Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "18 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm, swap: use page-cluster as max window of VMA based swap readahead
  mm: page_vma_mapped: ensure pmd is loaded with READ_ONCE outside of lock
  kmemleak: clear stale pointers from task stacks
  fs/binfmt_misc.c: node could be NULL when evicting inode
  fs/mpage.c: fix mpage_writepage() for pages with buffers
  linux/kernel.h: add/correct kernel-doc notation
  tty: fall back to N_NULL if switching to N_TTY fails during hangup
  Revert "vmalloc: back off when the current task is killed"
  mm/cma.c: take __GFP_NOWARN into account in cma_alloc()
  scripts/kallsyms.c: ignore symbol type 'n'
  userfaultfd: selftest: exercise -EEXIST only in background transfer
  mm: only display online cpus of the numa node
  mm: remove unnecessary WARN_ONCE in page_vma_mapped_walk().
  mm/mempolicy: fix NUMA_INTERLEAVE_HIT counter
  include/linux/of.h: provide of_n_{addr,size}_cells wrappers for !CONFIG_OF
  mm/madvise.c: add description for MADV_WIPEONFORK and MADV_KEEPONFORK
  lib/Kconfig.debug: kernel hacking menu: runtime testing: keep tests together
  mm/migrate: fix indexing bug (off by one) and avoid out of bound access

21 files changed, 245 insertions, 181 deletions

diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-swap b/Documentation/ABI/testing/sysfs-kernel-mm-swap
index 587db52084c7..94672016c268 100644
--- a/Documentation/ABI/testing/sysfs-kernel-mm-swap
+++ b/Documentation/ABI/testing/sysfs-kernel-mm-swap
@@ -14,13 +14,3 @@ Description:	Enable/disable VMA based swap readahead.
                 still used for tmpfs etc. other users.  If set to
                 false, the global swap readahead algorithm will be
                 used for all swappable pages.
-
-What:           /sys/kernel/mm/swap/vma_ra_max_order
-Date:           August 2017
-Contact:        Linux memory management mailing list <linux-mm@kvack.org>
-Description:    The max readahead size in order for VMA based swap readahead
-
-                VMA based swap readahead algorithm will readahead at
-                most 1 << max_order pages for each readahead.  The
-                real readahead size for each readahead will be scaled
-                according to the estimation algorithm.
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 3855902f2c5b..aae2402f3791 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -27,13 +27,21 @@ static struct bus_type node_subsys = {
 
 static ssize_t node_read_cpumap(struct device *dev, bool list, char *buf)
 {
+        ssize_t n;
+        cpumask_var_t mask;
         struct node *node_dev = to_node(dev);
-        const struct cpumask *mask = cpumask_of_node(node_dev->dev.id);
 
         /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */
         BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1));
 
-        return cpumap_print_to_pagebuf(list, buf, mask);
+        if (!alloc_cpumask_var(&mask, GFP_KERNEL))
+                return 0;
+
+        cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask);
+        n = cpumap_print_to_pagebuf(list, buf, mask);
+        free_cpumask_var(mask);
+
+        return n;
 }
 
 static inline ssize_t node_read_cpumask(struct device *dev,
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 2fe216b276e2..84a8ac2a779f 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -694,10 +694,8 @@ int tty_ldisc_reinit(struct tty_struct *tty, int disc)
         tty_set_termios_ldisc(tty, disc);
         retval = tty_ldisc_open(tty, tty->ldisc);
         if (retval) {
-                if (!WARN_ON(disc == N_TTY)) {
-                        tty_ldisc_put(tty->ldisc);
-                        tty->ldisc = NULL;
-                }
+                tty_ldisc_put(tty->ldisc);
+                tty->ldisc = NULL;
         }
         return retval;
 }
@@ -752,8 +750,9 @@ void tty_ldisc_hangup(struct tty_struct *tty, bool reinit)
 
         if (tty->ldisc) {
                 if (reinit) {
-                        if (tty_ldisc_reinit(tty, tty->termios.c_line) < 0)
-                                tty_ldisc_reinit(tty, N_TTY);
+                        if (tty_ldisc_reinit(tty, tty->termios.c_line) < 0 &&
+                            tty_ldisc_reinit(tty, N_TTY) < 0)
+                                WARN_ON(tty_ldisc_reinit(tty, N_NULL) < 0);
                 } else
                         tty_ldisc_kill(tty);
         }
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 2a46762def31..a7c5a9861bef 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -596,7 +596,7 @@ static void bm_evict_inode(struct inode *inode)
 {
         Node *e = inode->i_private;
 
-        if (e->flags & MISC_FMT_OPEN_FILE)
+        if (e && e->flags & MISC_FMT_OPEN_FILE)
                 filp_close(e->interp_file, NULL);
 
         clear_inode(inode);
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 93d088ffc05c..789f55e851ae 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -716,10 +716,12 @@ int bdev_write_page(struct block_device *bdev, sector_t sector,
 
         set_page_writeback(page);
         result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, true);
-        if (result)
+        if (result) {
                 end_page_writeback(page);
-        else
+        } else {
+                clean_page_buffers(page);
                 unlock_page(page);
+        }
         blk_queue_exit(bdev->bd_queue);
         return result;
 }
diff --git a/fs/mpage.c b/fs/mpage.c
index 37bb77c1302c..c991faec70b9 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -468,6 +468,16 @@ static void clean_buffers(struct page *page, unsigned first_unmapped)
                 try_to_free_buffers(page);
 }
 
+/*
+ * For situations where we want to clean all buffers attached to a page.
+ * We don't need to calculate how many buffers are attached to the page,
+ * we just need to specify a number larger than the maximum number of buffers.
+ */
+void clean_page_buffers(struct page *page)
+{
+        clean_buffers(page, ~0U);
+}
+
 static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
                       void *data)
 {
@@ -605,10 +615,8 @@ alloc_new:
         if (bio == NULL) {
                 if (first_unmapped == blocks_per_page) {
                         if (!bdev_write_page(bdev, blocks[0] << (blkbits - 9),
-                                                                page, wbc)) {
-                                clean_buffers(page, first_unmapped);
+                                                                page, wbc))
                                 goto out;
-                        }
                 }
                 bio = mpage_alloc(bdev, blocks[0] << (blkbits - 9),
                                 BIO_MAX_PAGES, GFP_NOFS|__GFP_HIGH);
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index c8dae555eccf..446b24cac67d 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -232,6 +232,7 @@ int generic_write_end(struct file *, struct address_space *,
                                 loff_t, unsigned, unsigned,
                                 struct page *, void *);
 void page_zero_new_buffers(struct page *page, unsigned from, unsigned to);
+void clean_page_buffers(struct page *page);
 int cont_write_begin(struct file *, struct address_space *, loff_t,
                         unsigned, unsigned, struct page **, void **,
                         get_block_t *, loff_t *);
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 0ad4c3044cf9..91189bb0c818 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -44,6 +44,12 @@
 
 #define STACK_MAGIC     0xdeadbeef
 
+/**
+ * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value
+ * @x: value to repeat
+ *
+ * NOTE: @x is not checked for > 0xff; larger values produce odd results.
+ */
 #define REPEAT_BYTE(x)  ((~0ul / 0xff) * (x))
 
 /* @a is a power of 2 value */
@@ -57,6 +63,10 @@
 #define READ                    0
 #define WRITE                   1
 
+/**
+ * ARRAY_SIZE - get the number of elements in array @arr
+ * @arr: array to be sized
+ */
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
 
 #define u64_to_user_ptr(x) (            \
@@ -76,7 +86,15 @@
 #define round_up(x, y) ((((x)-1) | __round_mask(x, y))+1)
 #define round_down(x, y) ((x) & ~__round_mask(x, y))
 
+/**
+ * FIELD_SIZEOF - get the size of a struct's field
+ * @t: the target struct
+ * @f: the target struct's field
+ * Return: the size of @f in the struct definition without having a
+ * declared instance of @t.
+ */
 #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))
+
 #define DIV_ROUND_UP __KERNEL_DIV_ROUND_UP
 
 #define DIV_ROUND_DOWN_ULL(ll, d) \
@@ -107,7 +125,7 @@
 /*
  * Divide positive or negative dividend by positive or negative divisor
  * and round to closest integer. Result is undefined for negative
- * divisors if he dividend variable type is unsigned and for negative
+ * divisors if the dividend variable type is unsigned and for negative
  * dividends if the divisor variable type is unsigned.
  */
 #define DIV_ROUND_CLOSEST(x, divisor)(                  \
@@ -247,13 +265,13 @@ extern int _cond_resched(void);
  * @ep_ro: right open interval endpoint
  *
  * Perform a "reciprocal multiplication" in order to "scale" a value into
- * range [0, ep_ro), where the upper interval endpoint is right-open.
+ * range [0, @ep_ro), where the upper interval endpoint is right-open.
  * This is useful, e.g. for accessing a index of an array containing
- * ep_ro elements, for example. Think of it as sort of modulus, only that
+ * @ep_ro elements, for example. Think of it as sort of modulus, only that
  * the result isn't that of modulo. ;) Note that if initial input is a
  * small value, then result will return 0.
  *
- * Return: a result based on val in interval [0, ep_ro).
+ * Return: a result based on @val in interval [0, @ep_ro).
  */
 static inline u32 reciprocal_scale(u32 val, u32 ep_ro)
 {
@@ -618,8 +636,8 @@ do {									\
  * trace_printk - printf formatting in the ftrace buffer
  * @fmt: the printf format for printing
  *
- * Note: __trace_printk is an internal function for trace_printk and
- *       the @ip is passed in via the trace_printk macro.
+ * Note: __trace_printk is an internal function for trace_printk() and
+ *       the @ip is passed in via the trace_printk() macro.
  *
  * This function allows a kernel developer to debug fast path sections
  * that printk is not appropriate for. By scattering in various
@@ -629,7 +647,7 @@ do {									\
  * This is intended as a debugging tool for the developer only.
  * Please refrain from leaving trace_printks scattered around in
  * your code. (Extra memory is used for special buffers that are
- * allocated when trace_printk() is used)
+ * allocated when trace_printk() is used.)
  *
  * A little optization trick is done here. If there's only one
  * argument, there's no need to scan the string for printf formats.
@@ -681,7 +699,7 @@ int __trace_printk(unsigned long ip, const char *fmt, ...);
  *       the @ip is passed in via the trace_puts macro.
  *
  * This is similar to trace_printk() but is made for those really fast
- * paths that a developer wants the least amount of "Heisenbug" affects,
+ * paths that a developer wants the least amount of "Heisenbug" effects,
  * where the processing of the print format is still too much.
  *
  * This function allows a kernel developer to debug fast path sections
@@ -692,7 +710,7 @@ int __trace_printk(unsigned long ip, const char *fmt, ...);
  * This is intended as a debugging tool for the developer only.
  * Please refrain from leaving trace_puts scattered around in
  * your code. (Extra memory is used for special buffers that are
- * allocated when trace_puts() is used)
+ * allocated when trace_puts() is used.)
  *
  * Returns: 0 if nothing was written, positive # if string was.
  *  (1 when __trace_bputs is used, strlen(str) when __trace_puts is used)
@@ -771,6 +789,12 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
         t2 min2 = (y);                                  \
         (void) (&min1 == &min2);                        \
         min1 < min2 ? min1 : min2; })
+
+/**
+ * min - return minimum of two values of the same or compatible types
+ * @x: first value
+ * @y: second value
+ */
 #define min(x, y)                                       \
         __min(typeof(x), typeof(y),                     \
               __UNIQUE_ID(min1_), __UNIQUE_ID(min2_),   \
@@ -781,12 +805,31 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
         t2 max2 = (y);                                  \
         (void) (&max1 == &max2);                        \
         max1 > max2 ? max1 : max2; })
+
+/**
+ * max - return maximum of two values of the same or compatible types
+ * @x: first value
+ * @y: second value
+ */
 #define max(x, y)                                       \
         __max(typeof(x), typeof(y),                     \
               __UNIQUE_ID(max1_), __UNIQUE_ID(max2_),   \
               x, y)
 
+/**
+ * min3 - return minimum of three values
+ * @x: first value
+ * @y: second value
+ * @z: third value
+ */
 #define min3(x, y, z) min((typeof(x))min(x, y), z)
+
+/**
+ * max3 - return maximum of three values
+ * @x: first value
+ * @y: second value
+ * @z: third value
+ */
 #define max3(x, y, z) max((typeof(x))max(x, y), z)
 
 /**
@@ -805,8 +848,8 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
  * @lo: lowest allowable value
  * @hi: highest allowable value
  *
- * This macro does strict typechecking of lo/hi to make sure they are of the
- * same type as val.  See the unnecessary pointer comparisons.
+ * This macro does strict typechecking of @lo/@hi to make sure they are of the
+ * same type as @val.  See the unnecessary pointer comparisons.
  */
 #define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi)
 
@@ -816,11 +859,24 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
  *
  * Or not use min/max/clamp at all, of course.
  */
+
+/**
+ * min_t - return minimum of two values, using the specified type
+ * @type: data type to use
+ * @x: first value
+ * @y: second value
+ */
 #define min_t(type, x, y)                               \
         __min(type, type,                               \
               __UNIQUE_ID(min1_), __UNIQUE_ID(min2_),   \
               x, y)
 
+/**
+ * max_t - return maximum of two values, using the specified type
+ * @type: data type to use
+ * @x: first value
+ * @y: second value
+ */
 #define max_t(type, x, y)                               \
         __max(type, type,                               \
               __UNIQUE_ID(min1_), __UNIQUE_ID(min2_),   \
@@ -834,7 +890,7 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
  * @hi: maximum allowable value
  *
  * This macro does no typechecking and uses temporary variables of type
- * 'type' to make all the comparisons.
+ * @type to make all the comparisons.
  */
 #define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi)
 
@@ -845,15 +901,17 @@ static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
  * @hi: maximum allowable value
  *
  * This macro does no typechecking and uses temporary variables of whatever
- * type the input argument 'val' is.  This is useful when val is an unsigned
- * type and min and max are literals that will otherwise be assigned a signed
+ * type the input argument @val is.  This is useful when @val is an unsigned
+ * type and @lo and @hi are literals that will otherwise be assigned a signed
  * integer type.
  */
 #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
 
 
-/*
- * swap - swap value of @a and @b
+/**
+ * swap - swap values of @a and @b
+ * @a: first value
+ * @b: second value
  */
 #define swap(a, b) \
         do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
diff --git a/include/linux/of.h b/include/linux/of.h
index cfc34117fc92..b240ed69dc96 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -734,6 +734,16 @@ static inline struct device_node *of_get_cpu_node(int cpu,
         return NULL;
 }
 
+static inline int of_n_addr_cells(struct device_node *np)
+{
+        return 0;
+
+}
+static inline int of_n_size_cells(struct device_node *np)
+{
+        return 0;
+}
+
 static inline int of_property_read_u64(const struct device_node *np,
                                        const char *propname, u64 *out_value)
 {
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index 905d769d8ddc..5f7eeab990fe 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -42,7 +42,7 @@ enum {
 #define THREAD_ALIGN    THREAD_SIZE
 #endif
 
-#ifdef CONFIG_DEBUG_STACK_USAGE
+#if IS_ENABLED(CONFIG_DEBUG_STACK_USAGE) || IS_ENABLED(CONFIG_DEBUG_KMEMLEAK)
 # define THREADINFO_GFP         (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
                                  __GFP_ZERO)
 #else
diff --git a/kernel/fork.c b/kernel/fork.c
index e702cb9ffbd8..07cc743698d3 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -215,6 +215,10 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
                 if (!s)
                         continue;
 
+#ifdef CONFIG_DEBUG_KMEMLEAK
+                /* Clear stale pointers from reused stack. */
+                memset(s->addr, 0, THREAD_SIZE);
+#endif
                 tsk->stack_vm_area = s;
                 return s->addr;
         }
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 2689b7c50c52..c1e720a22c71 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1590,6 +1590,54 @@ config LATENCYTOP
 
 source kernel/trace/Kconfig
 
+config PROVIDE_OHCI1394_DMA_INIT
+        bool "Remote debugging over FireWire early on boot"
+        depends on PCI && X86
+        help
+          If you want to debug problems which hang or crash the kernel early
+          on boot and the crashing machine has a FireWire port, you can use
+          this feature to remotely access the memory of the crashed machine
+          over FireWire. This employs remote DMA as part of the OHCI1394
+          specification which is now the standard for FireWire controllers.
+
+          With remote DMA, you can monitor the printk buffer remotely using
+          firescope and access all memory below 4GB using fireproxy from gdb.
+          Even controlling a kernel debugger is possible using remote DMA.
+
+          Usage:
+
+          If ohci1394_dma=early is used as boot parameter, it will initialize
+          all OHCI1394 controllers which are found in the PCI config space.
+
+          As all changes to the FireWire bus such as enabling and disabling
+          devices cause a bus reset and thereby disable remote DMA for all
+          devices, be sure to have the cable plugged and FireWire enabled on
+          the debugging host before booting the debug target for debugging.
+
+          This code (~1k) is freed after boot. By then, the firewire stack
+          in charge of the OHCI-1394 controllers should be used instead.
+
+          See Documentation/debugging-via-ohci1394.txt for more information.
+
+config DMA_API_DEBUG
+        bool "Enable debugging of DMA-API usage"
+        depends on HAVE_DMA_API_DEBUG
+        help
+          Enable this option to debug the use of the DMA API by device drivers.
+          With this option you will be able to detect common bugs in device
+          drivers like double-freeing of DMA mappings or freeing mappings that
+          were never allocated.
+
+          This also attempts to catch cases where a page owned by DMA is
+          accessed by the cpu in a way that could cause data corruption.  For
+          example, this enables cow_user_page() to check that the source page is
+          not undergoing DMA.
+
+          This option causes a performance degradation.  Use only if you want to
+          debug device drivers and dma interactions.
+
+          If unsure, say N.
+
 menu "Runtime Testing"
 
 config LKDTM
@@ -1749,56 +1797,6 @@ config TEST_PARMAN
 
           If unsure, say N.
 
-endmenu # runtime tests
-
-config PROVIDE_OHCI1394_DMA_INIT
-        bool "Remote debugging over FireWire early on boot"
-        depends on PCI && X86
-        help
-          If you want to debug problems which hang or crash the kernel early
-          on boot and the crashing machine has a FireWire port, you can use
-          this feature to remotely access the memory of the crashed machine
-          over FireWire. This employs remote DMA as part of the OHCI1394
-          specification which is now the standard for FireWire controllers.
-
-          With remote DMA, you can monitor the printk buffer remotely using
-          firescope and access all memory below 4GB using fireproxy from gdb.
-          Even controlling a kernel debugger is possible using remote DMA.
-
-          Usage:
-
-          If ohci1394_dma=early is used as boot parameter, it will initialize
-          all OHCI1394 controllers which are found in the PCI config space.
-
-          As all changes to the FireWire bus such as enabling and disabling
-          devices cause a bus reset and thereby disable remote DMA for all
-          devices, be sure to have the cable plugged and FireWire enabled on
-          the debugging host before booting the debug target for debugging.
-
-          This code (~1k) is freed after boot. By then, the firewire stack
-          in charge of the OHCI-1394 controllers should be used instead.
-
-          See Documentation/debugging-via-ohci1394.txt for more information.
-
-config DMA_API_DEBUG
-        bool "Enable debugging of DMA-API usage"
-        depends on HAVE_DMA_API_DEBUG
-        help
-          Enable this option to debug the use of the DMA API by device drivers.
-          With this option you will be able to detect common bugs in device
-          drivers like double-freeing of DMA mappings or freeing mappings that
-          were never allocated.
-
-          This also attempts to catch cases where a page owned by DMA is
-          accessed by the cpu in a way that could cause data corruption.  For
-          example, this enables cow_user_page() to check that the source page is
-          not undergoing DMA.
-
-          This option causes a performance degradation.  Use only if you want to
-          debug device drivers and dma interactions.
-
-          If unsure, say N.
-
 config TEST_LKM
         tristate "Test module loading with 'hello world' module"
         default n
@@ -1873,18 +1871,6 @@ config TEST_UDELAY
 
           If unsure, say N.
 
-config MEMTEST
-        bool "Memtest"
-        depends on HAVE_MEMBLOCK
-        ---help---
-          This option adds a kernel parameter 'memtest', which allows memtest
-          to be set.
-                memtest=0, mean disabled; -- default
-                memtest=1, mean do 1 test pattern;
-                ...
-                memtest=17, mean do 17 test patterns.
-          If you are unsure how to answer this question, answer N.
-
 config TEST_STATIC_KEYS
         tristate "Test static keys"
         default n
@@ -1894,16 +1880,6 @@ config TEST_STATIC_KEYS
 
           If unsure, say N.
 
-config BUG_ON_DATA_CORRUPTION
-        bool "Trigger a BUG when data corruption is detected"
-        select DEBUG_LIST
-        help
-          Select this option if the kernel should BUG when it encounters
-          data corruption in kernel memory structures when they get checked
-          for validity.
-
-          If unsure, say N.
-
 config TEST_KMOD
         tristate "kmod stress tester"
         default n
@@ -1941,6 +1917,29 @@ config TEST_DEBUG_VIRTUAL
 
           If unsure, say N.
 
+endmenu # runtime tests
+
+config MEMTEST
+        bool "Memtest"
+        depends on HAVE_MEMBLOCK
+        ---help---
+          This option adds a kernel parameter 'memtest', which allows memtest
+          to be set.
+                memtest=0, mean disabled; -- default
+                memtest=1, mean do 1 test pattern;
+                ...
+                memtest=17, mean do 17 test patterns.
+          If you are unsure how to answer this question, answer N.
+
+config BUG_ON_DATA_CORRUPTION
+        bool "Trigger a BUG when data corruption is detected"
+        select DEBUG_LIST
+        help
+          Select this option if the kernel should BUG when it encounters
+          data corruption in kernel memory structures when they get checked
+          for validity.
+
+          If unsure, say N.
 
 source "samples/Kconfig"
 
diff --git a/mm/cma.c b/mm/cma.c
index c0da318c020e..022e52bd8370 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -460,7 +460,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
 
         trace_cma_alloc(pfn, page, count, align);
 
-        if (ret) {
+        if (ret && !(gfp_mask & __GFP_NOWARN)) {
                 pr_info("%s: alloc failed, req-size: %zu pages, ret: %d\n",
                         __func__, count, ret);
                 cma_debug_show_areas(cma);
diff --git a/mm/madvise.c b/mm/madvise.c
index 25bade36e9ca..fd70d6aabc3e 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -757,6 +757,9 @@ madvise_behavior_valid(int behavior)
  *  MADV_DONTFORK - omit this area from child's address space when forking:
  *              typically, to avoid COWing pages pinned by get_user_pages().
  *  MADV_DOFORK - cancel MADV_DONTFORK: no longer omit this area when forking.
+ *  MADV_WIPEONFORK - present the child process with zero-filled memory in this
+ *              range after a fork.
+ *  MADV_KEEPONFORK - undo the effect of MADV_WIPEONFORK
  *  MADV_HWPOISON - trigger memory error handler as if the given memory range
  *              were corrupted by unrecoverable hardware memory failure.
  *  MADV_SOFT_OFFLINE - try to soft-offline the given range of memory.
@@ -777,7 +780,9 @@ madvise_behavior_valid(int behavior)
  *  zero    - success
  *  -EINVAL - start + len < 0, start is not page-aligned,
  *              "behavior" is not a valid value, or application
- *              is attempting to release locked or shared pages.
+ *              is attempting to release locked or shared pages,
+ *              or the specified address range includes file, Huge TLB,
+ *              MAP_SHARED or VMPFNMAP range.
  *  -ENOMEM - addresses in the specified range are not currently
  *              mapped, or are outside the AS of the process.
  *  -EIO    - an I/O error occurred while paging in data.
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 006ba625c0b8..a2af6d58a68f 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1920,8 +1920,11 @@ static struct page *alloc_page_interleave(gfp_t gfp, unsigned order,
         struct page *page;
 
         page = __alloc_pages(gfp, order, nid);
-        if (page && page_to_nid(page) == nid)
-                inc_zone_page_state(page, NUMA_INTERLEAVE_HIT);
+        if (page && page_to_nid(page) == nid) {
+                preempt_disable();
+                __inc_numa_state(page_zone(page), NUMA_INTERLEAVE_HIT);
+                preempt_enable();
+        }
         return page;
 }
 
diff --git a/mm/migrate.c b/mm/migrate.c
index 6954c1435833..e00814ca390e 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2146,8 +2146,9 @@ static int migrate_vma_collect_hole(unsigned long start,
         unsigned long addr;
 
         for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) {
-                migrate->src[migrate->npages++] = MIGRATE_PFN_MIGRATE;
+                migrate->src[migrate->npages] = MIGRATE_PFN_MIGRATE;
                 migrate->dst[migrate->npages] = 0;
+                migrate->npages++;
                 migrate->cpages++;
         }
 
diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c
index 6a03946469a9..53afbb919a1c 100644
--- a/mm/page_vma_mapped.c
+++ b/mm/page_vma_mapped.c
@@ -6,17 +6,6 @@
 
 #include "internal.h"
 
-static inline bool check_pmd(struct page_vma_mapped_walk *pvmw)
-{
-        pmd_t pmde;
-        /*
-         * Make sure we don't re-load pmd between present and !trans_huge check.
-         * We need a consistent view.
-         */
-        pmde = READ_ONCE(*pvmw->pmd);
-        return pmd_present(pmde) && !pmd_trans_huge(pmde);
-}
-
 static inline bool not_found(struct page_vma_mapped_walk *pvmw)
 {
         page_vma_mapped_walk_done(pvmw);
@@ -116,6 +105,7 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw)
         pgd_t *pgd;
         p4d_t *p4d;
         pud_t *pud;
+        pmd_t pmde;
 
         /* The only possible pmd mapping has been handled on last iteration */
         if (pvmw->pmd && !pvmw->pte)
@@ -148,7 +138,13 @@ restart:
         if (!pud_present(*pud))
                 return false;
         pvmw->pmd = pmd_offset(pud, pvmw->address);
-        if (pmd_trans_huge(*pvmw->pmd) || is_pmd_migration_entry(*pvmw->pmd)) {
+        /*
+         * Make sure the pmd value isn't cached in a register by the
+         * compiler and used as a stale value after we've observed a
+         * subsequent update.
+         */
+        pmde = READ_ONCE(*pvmw->pmd);
+        if (pmd_trans_huge(pmde) || is_pmd_migration_entry(pmde)) {
                 pvmw->ptl = pmd_lock(mm, pvmw->pmd);
                 if (likely(pmd_trans_huge(*pvmw->pmd))) {
                         if (pvmw->flags & PVMW_MIGRATION)
@@ -167,17 +163,15 @@ restart:
                                                 return not_found(pvmw);
                                         return true;
                                 }
-                        } else
-                                WARN_ONCE(1, "Non present huge pmd without pmd migration enabled!");
+                        }
                         return not_found(pvmw);
                 } else {
                         /* THP pmd was split under us: handle on pte level */
                         spin_unlock(pvmw->ptl);
                         pvmw->ptl = NULL;
                 }
-        } else {
-                if (!check_pmd(pvmw))
-                        return false;
+        } else if (!pmd_present(pmde)) {
+                return false;
         }
         if (!map_pte(pvmw))
                 goto next_pte;
diff --git a/mm/swap_state.c b/mm/swap_state.c
index ed91091d1e68..05b6803f0cce 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -39,10 +39,6 @@ struct address_space *swapper_spaces[MAX_SWAPFILES];
 static unsigned int nr_swapper_spaces[MAX_SWAPFILES];
 bool swap_vma_readahead = true;
 
-#define SWAP_RA_MAX_ORDER_DEFAULT       3
-
-static int swap_ra_max_order = SWAP_RA_MAX_ORDER_DEFAULT;
-
 #define SWAP_RA_WIN_SHIFT       (PAGE_SHIFT / 2)
 #define SWAP_RA_HITS_MASK       ((1UL << SWAP_RA_WIN_SHIFT) - 1)
 #define SWAP_RA_HITS_MAX        SWAP_RA_HITS_MASK
@@ -664,6 +660,13 @@ struct page *swap_readahead_detect(struct vm_fault *vmf,
         pte_t *tpte;
 #endif
 
+        max_win = 1 << min_t(unsigned int, READ_ONCE(page_cluster),
+                             SWAP_RA_ORDER_CEILING);
+        if (max_win == 1) {
+                swap_ra->win = 1;
+                return NULL;
+        }
+
         faddr = vmf->address;
         entry = pte_to_swp_entry(vmf->orig_pte);
         if ((unlikely(non_swap_entry(entry))))
@@ -672,12 +675,6 @@ struct page *swap_readahead_detect(struct vm_fault *vmf,
         if (page)
                 return page;
 
-        max_win = 1 << READ_ONCE(swap_ra_max_order);
-        if (max_win == 1) {
-                swap_ra->win = 1;
-                return NULL;
-        }
-
         fpfn = PFN_DOWN(faddr);
         swap_ra_info = GET_SWAP_RA_VAL(vma);
         pfn = PFN_DOWN(SWAP_RA_ADDR(swap_ra_info));
@@ -786,32 +783,8 @@ static struct kobj_attribute vma_ra_enabled_attr =
         __ATTR(vma_ra_enabled, 0644, vma_ra_enabled_show,
                vma_ra_enabled_store);
 
-static ssize_t vma_ra_max_order_show(struct kobject *kobj,
-                                     struct kobj_attribute *attr, char *buf)
-{
-        return sprintf(buf, "%d\n", swap_ra_max_order);
-}
-static ssize_t vma_ra_max_order_store(struct kobject *kobj,
-                                      struct kobj_attribute *attr,
-                                      const char *buf, size_t count)
-{
-        int err, v;
-
-        err = kstrtoint(buf, 10, &v);
-        if (err || v > SWAP_RA_ORDER_CEILING || v <= 0)
-                return -EINVAL;
-
-        swap_ra_max_order = v;
-
-        return count;
-}
-static struct kobj_attribute vma_ra_max_order_attr =
-        __ATTR(vma_ra_max_order, 0644, vma_ra_max_order_show,
-               vma_ra_max_order_store);
-
 static struct attribute *swap_attrs[] = {
         &vma_ra_enabled_attr.attr,
-        &vma_ra_max_order_attr.attr,
         NULL,
 };
 
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 8a43db6284eb..673942094328 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1695,11 +1695,6 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
         for (i = 0; i < area->nr_pages; i++) {
                 struct page *page;
 
-                if (fatal_signal_pending(current)) {
-                        area->nr_pages = i;
-                        goto fail_no_warn;
-                }
-
                 if (node == NUMA_NO_NODE)
                         page = alloc_page(alloc_mask|highmem_mask);
                 else
@@ -1723,7 +1718,6 @@ fail:
         warn_alloc(gfp_mask, NULL,
                           "vmalloc: allocation failure, allocated %ld of %ld bytes",
                           (area->nr_pages*PAGE_SIZE), area->size);
-fail_no_warn:
         vfree(area->addr);
         return NULL;
 }
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 5d554419170b..9ee9bf7fd1a2 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -158,7 +158,7 @@ static int read_symbol(FILE *in, struct sym_entry *s)
         else if (str[0] == '$')
                 return -1;
         /* exclude debugging symbols */
-        else if (stype == 'N')
+        else if (stype == 'N' || stype == 'n')
                 return -1;
 
         /* include the type field in the symbol name, so that it gets
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index a2c53a3d223d..de2f9ec8a87f 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -397,7 +397,7 @@ static void retry_copy_page(int ufd, struct uffdio_copy *uffdio_copy,
         }
 }
 
-static int copy_page(int ufd, unsigned long offset)
+static int __copy_page(int ufd, unsigned long offset, bool retry)
 {
         struct uffdio_copy uffdio_copy;
 
@@ -418,7 +418,7 @@ static int copy_page(int ufd, unsigned long offset)
                 fprintf(stderr, "UFFDIO_COPY unexpected copy %Ld\n",
                         uffdio_copy.copy), exit(1);
         } else {
-                if (test_uffdio_copy_eexist) {
+                if (test_uffdio_copy_eexist && retry) {
                         test_uffdio_copy_eexist = false;
                         retry_copy_page(ufd, &uffdio_copy, offset);
                 }
@@ -427,6 +427,16 @@ static int copy_page(int ufd, unsigned long offset)
         return 0;
 }
 
+static int copy_page_retry(int ufd, unsigned long offset)
+{
+        return __copy_page(ufd, offset, true);
+}
+
+static int copy_page(int ufd, unsigned long offset)
+{
+        return __copy_page(ufd, offset, false);
+}
+
 static void *uffd_poll_thread(void *arg)
 {
         unsigned long cpu = (unsigned long) arg;
@@ -544,7 +554,7 @@ static void *background_thread(void *arg)
         for (page_nr = cpu * nr_pages_per_cpu;
              page_nr < (cpu+1) * nr_pages_per_cpu;
              page_nr++)
-                copy_page(uffd, page_nr * page_size);
+                copy_page_retry(uffd, page_nr * page_size);
 
         return NULL;
 }
@@ -779,7 +789,7 @@ static void retry_uffdio_zeropage(int ufd,
         }
 }
 
-static int uffdio_zeropage(int ufd, unsigned long offset)
+static int __uffdio_zeropage(int ufd, unsigned long offset, bool retry)
 {
         struct uffdio_zeropage uffdio_zeropage;
         int ret;
@@ -814,7 +824,7 @@ static int uffdio_zeropage(int ufd, unsigned long offset)
                         fprintf(stderr, "UFFDIO_ZEROPAGE unexpected %Ld\n",
                                 uffdio_zeropage.zeropage), exit(1);
                 } else {
-                        if (test_uffdio_zeropage_eexist) {
+                        if (test_uffdio_zeropage_eexist && retry) {
                                 test_uffdio_zeropage_eexist = false;
                                 retry_uffdio_zeropage(ufd, &uffdio_zeropage,
                                                       offset);
@@ -830,6 +840,11 @@ static int uffdio_zeropage(int ufd, unsigned long offset)
         return 0;
 }
 
+static int uffdio_zeropage(int ufd, unsigned long offset)
+{
+        return __uffdio_zeropage(ufd, offset, false);
+}
+
 /* exercise UFFDIO_ZEROPAGE */
 static int userfaultfd_zeropage_test(void)
 {