add changelog

1 files changed, 22 insertions, 0 deletions

diff --git a/printk-dev_printk.patch b/printk-dev_printk.patch
index 155097d..c2a3557 100644
--- a/printk-dev_printk.patch
+++ b/printk-dev_printk.patch
@@ -1,3 +1,25 @@
+From: Kay Sievers <kay@vrfy.org>
+Subject: driver-core: extend dev_printk() to pass structured data
+
+This patch extends printk() to be able to attach arbitrary key/value
+pairs to logged messages, to carry machine-readable data which
+describes the context of the log message at time of its
+creation. Users of the log can retrieve, along with the human-readable
+message, a key/value dictionary to reliably identify specific devices,
+drivers, subsystems, classes and types of messages.
+
+The output of dev_printk() is reliably machine-readable now. In addition
+to the printed plain text message, it creates a log dictionary with the
+these properties:
+    SUBSYSTEM=     - the driver-core subsytem name
+    DEVICE=
+      b12:8        - block dev_t
+      c127:3       - char dev_t
+      n8           - netdev ifindex
+      +sound:card0 - subsystem:devname
+
+Tested-by: William Douglas <william.douglas@intel.com>
+Signed-off-by: Kay Sievers <kay@vrfy.org>
 ---
  drivers/base/core.c |   52 +++++++++++++++++++++++++++++++++++++++++++++++++---
  1 file changed, 49 insertions(+), 3 deletions(-)