Merge branch 'akpm' (patches from Andrew Morton)

Merge fixes from Andrew Morton:
 "14 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  shmem: fix init_page_accessed use to stop !PageLRU bug
  kernel/printk/printk.c: revert "printk: enable interrupts before calling console_trylock_for_printk()"
  tools/testing/selftests/ipc/msgque.c: improve error handling when not running as root
  fs/seq_file: fallback to vmalloc allocation
  /proc/stat: convert to single_open_size()
  hwpoison: fix the handling path of the victimized page frame that belong to non-LRU
  mm:vmscan: update the trace-vmscan-postprocess.pl for event vmscan/mm_vmscan_lru_isolate
  msync: fix incorrect fstart calculation
  zram: revalidate disk after capacity change
  tools: memory-hotplug fix unexpected operator error
  tools: cpu-hotplug fix unexpected operator error
  autofs4: fix false positive compile error
  slub: fix off by one in number of slab tests
  mm: page_alloc: fix CMA area initialisation when pageblock > MAX_ORDER

14 files changed, 89 insertions, 86 deletions

diff --git a/Documentation/trace/postprocess/trace-vmscan-postprocess.pl b/Documentation/trace/postprocess/trace-vmscan-postprocess.pl
index 00e425faa2fd..78c9a7b2b58f 100644
--- a/Documentation/trace/postprocess/trace-vmscan-postprocess.pl
+++ b/Documentation/trace/postprocess/trace-vmscan-postprocess.pl
@@ -47,7 +47,6 @@ use constant HIGH_KSWAPD_REWAKEUP		=> 21;
 use constant HIGH_NR_SCANNED                    => 22;
 use constant HIGH_NR_TAKEN                      => 23;
 use constant HIGH_NR_RECLAIMED                  => 24;
-use constant HIGH_NR_CONTIG_DIRTY               => 25;
 
 my %perprocesspid;
 my %perprocess;
@@ -105,7 +104,7 @@ my $regex_direct_end_default = 'nr_reclaimed=([0-9]*)';
 my $regex_kswapd_wake_default = 'nid=([0-9]*) order=([0-9]*)';
 my $regex_kswapd_sleep_default = 'nid=([0-9]*)';
 my $regex_wakeup_kswapd_default = 'nid=([0-9]*) zid=([0-9]*) order=([0-9]*)';
-my $regex_lru_isolate_default = 'isolate_mode=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_taken=([0-9]*) contig_taken=([0-9]*) contig_dirty=([0-9]*) contig_failed=([0-9]*)';
+my $regex_lru_isolate_default = 'isolate_mode=([0-9]*) order=([0-9]*) nr_requested=([0-9]*) nr_scanned=([0-9]*) nr_taken=([0-9]*) file=([0-9]*)';
 my $regex_lru_shrink_inactive_default = 'nid=([0-9]*) zid=([0-9]*) nr_scanned=([0-9]*) nr_reclaimed=([0-9]*) priority=([0-9]*) flags=([A-Z_|]*)';
 my $regex_lru_shrink_active_default = 'lru=([A-Z_]*) nr_scanned=([0-9]*) nr_rotated=([0-9]*) priority=([0-9]*)';
 my $regex_writepage_default = 'page=([0-9a-f]*) pfn=([0-9]*) flags=([A-Z_|]*)';
@@ -200,7 +199,7 @@ $regex_lru_isolate = generate_traceevent_regex(
                         $regex_lru_isolate_default,
                         "isolate_mode", "order",
                         "nr_requested", "nr_scanned", "nr_taken",
-                        "contig_taken", "contig_dirty", "contig_failed");
+                        "file");
 $regex_lru_shrink_inactive = generate_traceevent_regex(
                         "vmscan/mm_vmscan_lru_shrink_inactive",
                         $regex_lru_shrink_inactive_default,
@@ -375,7 +374,6 @@ EVENT_PROCESS:
                         }
                         my $isolate_mode = $1;
                         my $nr_scanned = $4;
-                        my $nr_contig_dirty = $7;
 
                         # To closer match vmstat scanning statistics, only count isolate_both
                         # and isolate_inactive as scanning. isolate_active is rotation
@@ -385,7 +383,6 @@ EVENT_PROCESS:
                         if ($isolate_mode != 2) {
                                 $perprocesspid{$process_pid}->{HIGH_NR_SCANNED} += $nr_scanned;
                         }
-                        $perprocesspid{$process_pid}->{HIGH_NR_CONTIG_DIRTY} += $nr_contig_dirty;
                 } elsif ($tracepoint eq "mm_vmscan_lru_shrink_inactive") {
                         $details = $6;
                         if ($details !~ /$regex_lru_shrink_inactive/o) {
@@ -539,13 +536,6 @@ sub dump_stats {
                                 }
                         }
                 }
-                if ($stats{$process_pid}->{HIGH_NR_CONTIG_DIRTY}) {
-                        print "      ";
-                        my $count = $stats{$process_pid}->{HIGH_NR_CONTIG_DIRTY};
-                        if ($count != 0) {
-                                print "contig-dirty=$count ";
-                        }
-                }
 
                 print "\n";
         }
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 48eccb350180..089e72cd37be 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -622,8 +622,10 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity)
         memset(&zram->stats, 0, sizeof(zram->stats));
 
         zram->disksize = 0;
-        if (reset_capacity)
+        if (reset_capacity) {
                 set_capacity(zram->disk, 0);
+                revalidate_disk(zram->disk);
+        }
         up_write(&zram->init_lock);
 }
 
@@ -664,6 +666,7 @@ static ssize_t disksize_store(struct device *dev,
         zram->comp = comp;
         zram->disksize = disksize;
         set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
+        revalidate_disk(zram->disk);
         up_write(&zram->init_lock);
         return len;
 
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index d7bd395ab586..1c55388ae633 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -210,7 +210,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
         int pipefd;
         struct autofs_sb_info *sbi;
         struct autofs_info *ino;
-        int pgrp;
+        int pgrp = 0;
         bool pgrp_set = false;
         int ret = -EINVAL;
 
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 9d231e9e5f0e..bf2d03f8fd3e 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -184,29 +184,11 @@ static int show_stat(struct seq_file *p, void *v)
 
 static int stat_open(struct inode *inode, struct file *file)
 {
-        size_t size = 1024 + 128 * num_possible_cpus();
-        char *buf;
-        struct seq_file *m;
-        int res;
+        size_t size = 1024 + 128 * num_online_cpus();
 
         /* minimum size to display an interrupt count : 2 bytes */
         size += 2 * nr_irqs;
-
-        /* don't ask for more than the kmalloc() max size */
-        if (size > KMALLOC_MAX_SIZE)
-                size = KMALLOC_MAX_SIZE;
-        buf = kmalloc(size, GFP_KERNEL);
-        if (!buf)
-                return -ENOMEM;
-
-        res = single_open(file, show_stat, NULL);
-        if (!res) {
-                m = file->private_data;
-                m->buf = buf;
-                m->size = ksize(buf);
-        } else
-                kfree(buf);
-        return res;
+        return single_open_size(file, show_stat, NULL, size);
 }
 
 static const struct file_operations proc_stat_operations = {
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 1d641bb108d2..3857b720cb1b 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -8,8 +8,10 @@
 #include <linux/fs.h>
 #include <linux/export.h>
 #include <linux/seq_file.h>
+#include <linux/vmalloc.h>
 #include <linux/slab.h>
 #include <linux/cred.h>
+#include <linux/mm.h>
 
 #include <asm/uaccess.h>
 #include <asm/page.h>
@@ -30,6 +32,16 @@ static void seq_set_overflow(struct seq_file *m)
         m->count = m->size;
 }
 
+static void *seq_buf_alloc(unsigned long size)
+{
+        void *buf;
+
+        buf = kmalloc(size, GFP_KERNEL | __GFP_NOWARN);
+        if (!buf && size > PAGE_SIZE)
+                buf = vmalloc(size);
+        return buf;
+}
+
 /**
  *      seq_open -      initialize sequential file
  *      @file: file we initialize
@@ -96,7 +108,7 @@ static int traverse(struct seq_file *m, loff_t offset)
                 return 0;
         }
         if (!m->buf) {
-                m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL);
+                m->buf = seq_buf_alloc(m->size = PAGE_SIZE);
                 if (!m->buf)
                         return -ENOMEM;
         }
@@ -135,9 +147,9 @@ static int traverse(struct seq_file *m, loff_t offset)
 
 Eoverflow:
         m->op->stop(m, p);
-        kfree(m->buf);
+        kvfree(m->buf);
         m->count = 0;
-        m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);
+        m->buf = seq_buf_alloc(m->size <<= 1);
         return !m->buf ? -ENOMEM : -EAGAIN;
 }
 
@@ -192,7 +204,7 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
 
         /* grab buffer if we didn't have one */
         if (!m->buf) {
-                m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL);
+                m->buf = seq_buf_alloc(m->size = PAGE_SIZE);
                 if (!m->buf)
                         goto Enomem;
         }
@@ -232,9 +244,9 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
                 if (m->count < m->size)
                         goto Fill;
                 m->op->stop(m, p);
-                kfree(m->buf);
+                kvfree(m->buf);
                 m->count = 0;
-                m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);
+                m->buf = seq_buf_alloc(m->size <<= 1);
                 if (!m->buf)
                         goto Enomem;
                 m->version = 0;
@@ -350,7 +362,7 @@ EXPORT_SYMBOL(seq_lseek);
 int seq_release(struct inode *inode, struct file *file)
 {
         struct seq_file *m = file->private_data;
-        kfree(m->buf);
+        kvfree(m->buf);
         kfree(m);
         return 0;
 }
@@ -605,13 +617,13 @@ EXPORT_SYMBOL(single_open);
 int single_open_size(struct file *file, int (*show)(struct seq_file *, void *),
                 void *data, size_t size)
 {
-        char *buf = kmalloc(size, GFP_KERNEL);
+        char *buf = seq_buf_alloc(size);
         int ret;
         if (!buf)
                 return -ENOMEM;
         ret = single_open(file, show, data);
         if (ret) {
-                kfree(buf);
+                kvfree(buf);
                 return ret;
         }
         ((struct seq_file *)file->private_data)->buf = buf;
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index ea2d5f6962ed..13e839dbca07 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1416,9 +1416,10 @@ static int have_callable_console(void)
 /*
  * Can we actually use the console at this time on this cpu?
  *
- * Console drivers may assume that per-cpu resources have been allocated. So
- * unless they're explicitly marked as being able to cope (CON_ANYTIME) don't
- * call them until this CPU is officially up.
+ * Console drivers may assume that per-cpu resources have
+ * been allocated. So unless they're explicitly marked as
+ * being able to cope (CON_ANYTIME) don't call them until
+ * this CPU is officially up.
  */
 static inline int can_use_console(unsigned int cpu)
 {
@@ -1431,10 +1432,8 @@ static inline int can_use_console(unsigned int cpu)
  * console_lock held, and 'console_locked' set) if it
  * is successful, false otherwise.
  */
-static int console_trylock_for_printk(void)
+static int console_trylock_for_printk(unsigned int cpu)
 {
-        unsigned int cpu = smp_processor_id();
-
         if (!console_trylock())
                 return 0;
         /*
@@ -1609,8 +1608,7 @@ asmlinkage int vprintk_emit(int facility, int level,
                  */
                 if (!oops_in_progress && !lockdep_recursing(current)) {
                         recursion_bug = 1;
-                        local_irq_restore(flags);
-                        return 0;
+                        goto out_restore_irqs;
                 }
                 zap_locks();
         }
@@ -1718,27 +1716,21 @@ asmlinkage int vprintk_emit(int facility, int level,
 
         logbuf_cpu = UINT_MAX;
         raw_spin_unlock(&logbuf_lock);
-        lockdep_on();
-        local_irq_restore(flags);
 
         /* If called from the scheduler, we can not call up(). */
-        if (in_sched)
-                return printed_len;
-
-        /*
-         * Disable preemption to avoid being preempted while holding
-         * console_sem which would prevent anyone from printing to console
-         */
-        preempt_disable();
-        /*
-         * Try to acquire and then immediately release the console semaphore.
-         * The release will print out buffers and wake up /dev/kmsg and syslog()
-         * users.
-         */
-        if (console_trylock_for_printk())
-                console_unlock();
-        preempt_enable();
+        if (!in_sched) {
+                /*
+                 * Try to acquire and then immediately release the console
+                 * semaphore.  The release will print out buffers and wake up
+                 * /dev/kmsg and syslog() users.
+                 */
+                if (console_trylock_for_printk(this_cpu))
+                        console_unlock();
+        }
 
+        lockdep_on();
+out_restore_irqs:
+        local_irq_restore(flags);
         return printed_len;
 }
 EXPORT_SYMBOL(vprintk_emit);
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index cd8989c1027e..c6399e328931 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -895,7 +895,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
         struct page *hpage = *hpagep;
         struct page *ppage;
 
-        if (PageReserved(p) || PageSlab(p))
+        if (PageReserved(p) || PageSlab(p) || !PageLRU(p))
                 return SWAP_SUCCESS;
 
         /*
@@ -1159,9 +1159,6 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
                                         action_result(pfn, "free buddy, 2nd try", DELAYED);
                                 return 0;
                         }
-                        action_result(pfn, "non LRU", IGNORED);
-                        put_page(p);
-                        return -EBUSY;
                 }
         }
 
@@ -1194,6 +1191,9 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
                 return 0;
         }
 
+        if (!PageHuge(p) && !PageTransTail(p) && !PageLRU(p))
+                goto identify_page_state;
+
         /*
          * For error on the tail page, we should set PG_hwpoison
          * on the head page to show that the hugepage is hwpoisoned
@@ -1243,6 +1243,7 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
                 goto out;
         }
 
+identify_page_state:
         res = -EBUSY;
         /*
          * The first check uses the current page flags which may not have any
diff --git a/mm/msync.c b/mm/msync.c
index a5c673669ca6..992a1673d488 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -78,7 +78,8 @@ SYSCALL_DEFINE3(msync, unsigned long, start, size_t, len, int, flags)
                         goto out_unlock;
                 }
                 file = vma->vm_file;
-                fstart = start + ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
+                fstart = (start - vma->vm_start) +
+                         ((loff_t)vma->vm_pgoff << PAGE_SHIFT);
                 fend = fstart + (min(end, vma->vm_end) - start) - 1;
                 start = vma->vm_end;
                 if ((flags & MS_SYNC) && file &&
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 20d17f8266fe..0ea758b898fd 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -816,9 +816,21 @@ void __init init_cma_reserved_pageblock(struct page *page)
                 set_page_count(p, 0);
         } while (++p, --i);
 
-        set_page_refcounted(page);
         set_pageblock_migratetype(page, MIGRATE_CMA);
-        __free_pages(page, pageblock_order);
+
+        if (pageblock_order >= MAX_ORDER) {
+                i = pageblock_nr_pages;
+                p = page;
+                do {
+                        set_page_refcounted(p);
+                        __free_pages(p, MAX_ORDER - 1);
+                        p += MAX_ORDER_NR_PAGES;
+                } while (i -= MAX_ORDER_NR_PAGES);
+        } else {
+                set_page_refcounted(page);
+                __free_pages(page, pageblock_order);
+        }
+
         adjust_managed_page_count(page, pageblock_nr_pages);
 }
 #endif
diff --git a/mm/shmem.c b/mm/shmem.c
index 8f419cff9e34..1140f49b6ded 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1029,6 +1029,9 @@ repeat:
                 goto failed;
         }
 
+        if (page && sgp == SGP_WRITE)
+                mark_page_accessed(page);
+
         /* fallocated page? */
         if (page && !PageUptodate(page)) {
                 if (sgp != SGP_READ)
@@ -1110,6 +1113,9 @@ repeat:
                 shmem_recalc_inode(inode);
                 spin_unlock(&info->lock);
 
+                if (sgp == SGP_WRITE)
+                        mark_page_accessed(page);
+
                 delete_from_swap_cache(page);
                 set_page_dirty(page);
                 swap_free(swap);
@@ -1136,6 +1142,9 @@ repeat:
 
                 __SetPageSwapBacked(page);
                 __set_page_locked(page);
+                if (sgp == SGP_WRITE)
+                        init_page_accessed(page);
+
                 error = mem_cgroup_charge_file(page, current->mm,
                                                 gfp & GFP_RECLAIM_MASK);
                 if (error)
@@ -1412,13 +1421,9 @@ shmem_write_begin(struct file *file, struct address_space *mapping,
                         loff_t pos, unsigned len, unsigned flags,
                         struct page **pagep, void **fsdata)
 {
-        int ret;
         struct inode *inode = mapping->host;
         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
-        ret = shmem_getpage(inode, index, pagep, SGP_WRITE, NULL);
-        if (ret == 0 && *pagep)
-                init_page_accessed(*pagep);
-        return ret;
+        return shmem_getpage(inode, index, pagep, SGP_WRITE, NULL);
 }
 
 static int
diff --git a/mm/slub.c b/mm/slub.c
index b2b047327d76..73004808537e 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1881,7 +1881,7 @@ redo:
 
         new.frozen = 0;
 
-        if (!new.inuse && n->nr_partial > s->min_partial)
+        if (!new.inuse && n->nr_partial >= s->min_partial)
                 m = M_FREE;
         else if (new.freelist) {
                 m = M_PARTIAL;
@@ -1992,7 +1992,7 @@ static void unfreeze_partials(struct kmem_cache *s,
                                 new.freelist, new.counters,
                                 "unfreezing slab"));
 
-                if (unlikely(!new.inuse && n->nr_partial > s->min_partial)) {
+                if (unlikely(!new.inuse && n->nr_partial >= s->min_partial)) {
                         page->next = discard_page;
                         discard_page = page;
                 } else {
@@ -2620,7 +2620,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page,
                 return;
         }
 
-        if (unlikely(!new.inuse && n->nr_partial > s->min_partial))
+        if (unlikely(!new.inuse && n->nr_partial >= s->min_partial))
                 goto slab_empty;
 
         /*
diff --git a/tools/testing/selftests/cpu-hotplug/Makefile b/tools/testing/selftests/cpu-hotplug/Makefile
index ae5faf9aade2..790c23a9db44 100644
--- a/tools/testing/selftests/cpu-hotplug/Makefile
+++ b/tools/testing/selftests/cpu-hotplug/Makefile
@@ -1,6 +1,6 @@
 all:
 
 run_tests:
-        @/bin/sh ./on-off-test.sh || echo "cpu-hotplug selftests: [FAIL]"
+        @/bin/bash ./on-off-test.sh || echo "cpu-hotplug selftests: [FAIL]"
 
 clean:
diff --git a/tools/testing/selftests/ipc/msgque.c b/tools/testing/selftests/ipc/msgque.c
index aa290c0de6f5..552f0810bffb 100644
--- a/tools/testing/selftests/ipc/msgque.c
+++ b/tools/testing/selftests/ipc/msgque.c
@@ -193,6 +193,11 @@ int main(int argc, char **argv)
         int msg, pid, err;
         struct msgque_data msgque;
 
+        if (getuid() != 0) {
+                printf("Please run the test as root - Exiting.\n");
+                exit(1);
+        }
+
         msgque.key = ftok(argv[0], 822155650);
         if (msgque.key == -1) {
                 printf("Can't make key\n");
diff --git a/tools/testing/selftests/memory-hotplug/Makefile b/tools/testing/selftests/memory-hotplug/Makefile
index 350bfeda3aa8..058c76f5d102 100644
--- a/tools/testing/selftests/memory-hotplug/Makefile
+++ b/tools/testing/selftests/memory-hotplug/Makefile
@@ -1,6 +1,6 @@
 all:
 
 run_tests:
-        @/bin/sh ./on-off-test.sh || echo "memory-hotplug selftests: [FAIL]"
+        @/bin/bash ./on-off-test.sh || echo "memory-hotplug selftests: [FAIL]"
 
 clean: