Kernel 4.2

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Kernel downloads for the "Development stream"

Download Description
upstream kernel 4.2 kernel 4.2 - upstream with feature descriptions.
linux-4.2-s390-message-catalog.tar.gz / MD5 "Development Stream" kernel 4.2 - message-catalog (optional)

2015-09-18: kernel 4.2 - upstream (feature description)

To download the linux-4.2.tar.gz visit:

The upstream kernel 4.2 contains the following functionality developed by the Linux on z Systems development team:

Enable BRIDGEPORT mode on OSA devices and introduce 'promiscuity reflection' mode
This feature extends bridgeport functionality (sysfs attributes and udev events) to OSA devices. It also enables mapping of promiscuous mode of the network interface to either the primary or secondary bridgeport role of the OSA or HiperSockets device.
This feature requires an OSA card with firmware that has bridgeport support.
For documentation see Device Drivers, Features, and Commands, Chapter 15 'qeth device driver for OSA-Express (QDIO) and HiperSockets'.

Removal of software-emulated huge pages.
To enable future extension and improve stability remove legacy feature that emulates huge pages on virtual hardware which does not support real huge pages.
Affects all LPARs running Linux on machines that do not support EDAT (EDAT support was introduced with IBM System z10). Linux on such LPARs will not be able to use huge pages.
Affects all current z/VM versions. Linux on z/VM will not be able to use huge pages.

2015-09-18: "Development Stream" kernel 4.2 message catalog (feature - optional patch)

linux-4.2-s390-message-catalog.tar.gz / MD5 ... recommended (2015-09-18)

This patch contains:

Kernel message catalog.
Add support for automatic message tags to the printk macro families dev_xyz and pr_xyz. The message tag consists of a component name and a 24 bit hash of the message text. For each message that is documented in the included kernel message catalog a man page can be created with a script (which is included in the patch). The generated man pages contain explanatory text that is intended to help understand the messages.

Note that only s390 specific messages are prepared appropriately and included in the generated message catalog.

This patch is optional as it is very unlikely to be accepted in upstream kernel, but is recommended for all distributions which are built based on the 'Development stream'.