4 files changed, 10 insertions, 6 deletions

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index c9dcf98b4463..bece7c0b67b2 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -1420,19 +1420,19 @@ void run_posix_cpu_timers(struct task_struct *tsk)
          * timer call will interfere.
          */
         list_for_each_entry_safe(timer, next, &firing, it.cpu.entry) {
-                int firing;
+                int cpu_firing;
+
                 spin_lock(&timer->it_lock);
                 list_del_init(&timer->it.cpu.entry);
-                firing = timer->it.cpu.firing;
+                cpu_firing = timer->it.cpu.firing;
                 timer->it.cpu.firing = 0;
                 /*
                  * The firing flag is -1 if we collided with a reset
                  * of the timer, which already reported this
                  * almost-firing as an overrun.  So don't generate an event.
                  */
-                if (likely(firing >= 0)) {
+                if (likely(cpu_firing >= 0))
                         cpu_timer_fire(timer);
-                }
                 spin_unlock(&timer->it_lock);
         }
 }
diff --git a/kernel/sched.c b/kernel/sched.c
index b902e587a3a0..26efa475bdc1 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4732,7 +4732,7 @@ void account_process_tick(struct task_struct *p, int user_tick)
 
         if (user_tick)
                 account_user_time(p, one_jiffy, one_jiffy_scaled);
-        else if (p != rq->idle)
+        else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
                 account_system_time(p, HARDIRQ_OFFSET, one_jiffy,
                                     one_jiffy_scaled);
         else
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index e3d2c7dd59b9..ea78fa101ad6 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -103,6 +103,9 @@ static unsigned long one_ul = 1;
 static int one_hundred = 100;
 static int one_thousand = 1000;
 
+/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
+static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
+
 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 static int maxolduid = 65535;
 static int minolduid;
@@ -1006,7 +1009,7 @@ static struct ctl_table vm_table[] = {
                 .mode           = 0644,
                 .proc_handler   = &dirty_bytes_handler,
                 .strategy       = &sysctl_intvec,
-                .extra1         = &one_ul,
+                .extra1         = &dirty_bytes_min,
         },
         {
                 .procname       = "dirty_writeback_centisecs",
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 1ce5dc6372b8..a884c09006c4 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3448,6 +3448,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
                 if (!ref)
                         break;
 
+                ref->ref = 1;
                 ref->buffer = info->tr->buffer;
                 ref->page = ring_buffer_alloc_read_page(ref->buffer);
                 if (!ref->page) {