Merge 4.4.147 into android-4.4

Changes in 4.4.147
	scsi: qla2xxx: Fix ISP recovery on unload
	scsi: qla2xxx: Return error when TMF returns
	genirq: Make force irq threading setup more robust
	nohz: Fix local_timer_softirq_pending()
	netlink: Do not subscribe to non-existent groups
	netlink: Don't shift with UB on nlk->ngroups
	netlink: Don't shift on 64 for ngroups
	ext4: fix false negatives *and* false positives in ext4_check_descriptors()
	ACPI / PCI: Bail early in acpi_pci_add_bus() if there is no ACPI handle
	ring_buffer: tracing: Inherit the tracing setting to next ring buffer
	i2c: imx: Fix reinit_completion() use
	jfs: Fix inconsistency between memory allocation and ea_buf->max_size
	Linux 4.4.147

Change-Id: I067f9844278976dddef8063961a70e189c423de3
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index d9cd6191760b..fdaa88f38aec 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -3142,6 +3142,22 @@ int ring_buffer_record_is_on(struct ring_buffer *buffer)
 }
 
 /**
+ * ring_buffer_record_is_set_on - return true if the ring buffer is set writable
+ * @buffer: The ring buffer to see if write is set enabled
+ *
+ * Returns true if the ring buffer is set writable by ring_buffer_record_on().
+ * Note that this does NOT mean it is in a writable state.
+ *
+ * It may return true when the ring buffer has been disabled by
+ * ring_buffer_record_disable(), as that is a temporary disabling of
+ * the ring buffer.
+ */
+int ring_buffer_record_is_set_on(struct ring_buffer *buffer)
+{
+	return !(atomic_read(&buffer->record_disabled) & RB_BUFFER_OFF);
+}
+
+/**
  * ring_buffer_record_disable_cpu - stop all writes into the cpu_buffer
  * @buffer: The ring buffer to stop writes to.
  * @cpu: The CPU buffer to stop