HOWTO: Updates on subsystem trees, patchwork, -next (vs. -mm)
One of the roles which -mm fulfilled some time ago (to offer an integration testing ground) has been taken over by -next. This is still news to Documentation/HOWTO, so mention it there. Also add a word on how patchwork is used to track patches as they make their way into subsystem trees. Remove some arbitrary links to subsystem repositories; they can all be found in the MAINTAINERS database. Acked-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Stefan Richter
Greg Kroah-Hartman
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@ -221,8 +221,8 @@ branches. These different branches are:
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- main 2.6.x kernel tree
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- 2.6.x.y -stable kernel tree
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- 2.6.x -git kernel patches
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- 2.6.x -mm kernel patches
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- subsystem specific kernel trees and patches
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- the 2.6.x -next kernel tree for integration tests
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2.6.x kernel tree
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-----------------
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@ -232,7 +232,7 @@ process is as follows:
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- As soon as a new kernel is released a two weeks window is open,
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during this period of time maintainers can submit big diffs to
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Linus, usually the patches that have already been included in the
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-mm kernel for a few weeks. The preferred way to submit big changes
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-next kernel for a few weeks. The preferred way to submit big changes
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is using git (the kernel's source management tool, more information
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can be found at http://git.or.cz/) but plain patches are also just
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fine.
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@ -293,84 +293,43 @@ daily and represent the current state of Linus' tree. They are more
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experimental than -rc kernels since they are generated automatically
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without even a cursory glance to see if they are sane.
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2.6.x -mm kernel patches
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------------------------
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These are experimental kernel patches released by Andrew Morton. Andrew
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takes all of the different subsystem kernel trees and patches and mushes
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them together, along with a lot of patches that have been plucked from
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the linux-kernel mailing list. This tree serves as a proving ground for
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new features and patches. Once a patch has proved its worth in -mm for
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a while Andrew or the subsystem maintainer pushes it on to Linus for
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inclusion in mainline.
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It is heavily encouraged that all new patches get tested in the -mm tree
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before they are sent to Linus for inclusion in the main kernel tree. Code
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which does not make an appearance in -mm before the opening of the merge
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window will prove hard to merge into the mainline.
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These kernels are not appropriate for use on systems that are supposed
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to be stable and they are more risky to run than any of the other
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branches.
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If you wish to help out with the kernel development process, please test
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and use these kernel releases and provide feedback to the linux-kernel
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mailing list if you have any problems, and if everything works properly.
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In addition to all the other experimental patches, these kernels usually
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also contain any changes in the mainline -git kernels available at the
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time of release.
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The -mm kernels are not released on a fixed schedule, but usually a few
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-mm kernels are released in between each -rc kernel (1 to 3 is common).
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Subsystem Specific kernel trees and patches
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-------------------------------------------
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A number of the different kernel subsystem developers expose their
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development trees so that others can see what is happening in the
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different areas of the kernel. These trees are pulled into the -mm
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kernel releases as described above.
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The maintainers of the various kernel subsystems --- and also many
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kernel subsystem developers --- expose their current state of
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development in source repositories. That way, others can see what is
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happening in the different areas of the kernel. In areas where
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development is rapid, a developer may be asked to base his submissions
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onto such a subsystem kernel tree so that conflicts between the
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submission and other already ongoing work are avoided.
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Here is a list of some of the different kernel trees available:
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git trees:
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- Kbuild development tree, Sam Ravnborg <sam@ravnborg.org>
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git.kernel.org:/pub/scm/linux/kernel/git/sam/kbuild.git
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Most of these repositories are git trees, but there are also other SCMs
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in use, or patch queues being published as quilt series. Addresses of
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these subsystem repositories are listed in the MAINTAINERS file. Many
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of them can be browsed at http://git.kernel.org/.
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- ACPI development tree, Len Brown <len.brown@intel.com>
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git.kernel.org:/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6.git
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Before a proposed patch is committed to such a subsystem tree, it is
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subject to review which primarily happens on mailing lists (see the
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respective section below). For several kernel subsystems, this review
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process is tracked with the tool patchwork. Patchwork offers a web
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interface which shows patch postings, any comments on a patch or
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revisions to it, and maintainers can mark patches as under review,
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accepted, or rejected. Most of these patchwork sites are listed at
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http://patchwork.kernel.org/ or http://patchwork.ozlabs.org/.
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- Block development tree, Jens Axboe <jens.axboe@oracle.com>
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git.kernel.org:/pub/scm/linux/kernel/git/axboe/linux-2.6-block.git
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2.6.x -next kernel tree for integration tests
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---------------------------------------------
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Before updates from subsystem trees are merged into the mainline 2.6.x
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tree, they need to be integration-tested. For this purpose, a special
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testing repository exists into which virtually all subsystem trees are
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pulled on an almost daily basis:
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http://git.kernel.org/?p=linux/kernel/git/sfr/linux-next.git
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http://linux.f-seidel.de/linux-next/pmwiki/
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- DRM development tree, Dave Airlie <airlied@linux.ie>
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git.kernel.org:/pub/scm/linux/kernel/git/airlied/drm-2.6.git
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This way, the -next kernel gives a summary outlook onto what will be
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expected to go into the mainline kernel at the next merge period.
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Adventurous testers are very welcome to runtime-test the -next kernel.
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- ia64 development tree, Tony Luck <tony.luck@intel.com>
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git.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6.git
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- infiniband, Roland Dreier <rolandd@cisco.com>
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git.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband.git
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- libata, Jeff Garzik <jgarzik@pobox.com>
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git.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev.git
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- network drivers, Jeff Garzik <jgarzik@pobox.com>
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git.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6.git
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- pcmcia, Dominik Brodowski <linux@dominikbrodowski.net>
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git.kernel.org:/pub/scm/linux/kernel/git/brodo/pcmcia-2.6.git
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- SCSI, James Bottomley <James.Bottomley@hansenpartnership.com>
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git.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6.git
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- x86, Ingo Molnar <mingo@elte.hu>
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git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git
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quilt trees:
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- USB, Driver Core, and I2C, Greg Kroah-Hartman <gregkh@suse.de>
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kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/
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Other kernel trees can be found listed at http://git.kernel.org/ and in
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the MAINTAINERS file.
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Bug Reporting
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-------------
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