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Message-ID: <20090622180438.GG23972@bombadil.infradead.org> Date: Mon, 22 Jun 2009 14:04:38 -0400 From: "Luis R. Rodriguez" <lrodriguez@...eros.com> To: torvalds@...ux-foundation.org, Pavel Machek <pavel@....cz> Cc: Pavel Machek <pavel@....cz>, Greg KH <greg@...ah.com>, "corbet@....net" <corbet@....net>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>, "alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>, "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "tshibata@...jp.nec.com" <tshibata@...jp.nec.com>, lrodriguez@...eros.com Subject: [PATCH] Documentation: add documentation summary for rc-series and merge window This is losely based on previous discussions on linux-kernel [1][2][3]. Lets also refer people reading the stable rules to Documentation/development-process/. Also add the number of days it has taken between releases, and provide the average for the last 10 releases: 86.0 days. [1] http://marc.info/?l=linux-kernel&m=122048427801324&w=2 [2] http://marc.info/?l=linux-netdev&m=122048757705315&w=2 [3] http://marc.info/?l=linux-kernel&m=124515657407679&w=2 Signed-off-by: Luis R. Rodriguez <lrodriguez@...eros.com> --- OK PATCH form now based on all the feedback. Documentation/development-process/2.Process | 121 ++++++++++++++++++++++++-- Documentation/stable_kernel_rules.txt | 5 + 2 files changed, 116 insertions(+), 10 deletions(-) diff --git a/Documentation/development-process/2.Process b/Documentation/development-process/2.Process index d750321..41a05ed 100644 --- a/Documentation/development-process/2.Process +++ b/Documentation/development-process/2.Process @@ -7,20 +7,121 @@ course of one year, the kernel has since had to evolve a number of processes to keep development happening smoothly. A solid understanding of how the process works is required in order to be an effective part of it. +2.0:SUMMARY + +This section provides a brief summary of the kernel release rules. + +2.0.0: KERNEL RELEASE RULES + +Stable kernels are released when they are ready! This means there are +absolutely no strict guidelines for sticking to specific dates for a +kernel release. + +2.0.1: MERGE WINDOW + +The merge window opens up after the next stable kernel is released. +The merge window is when maintainers of different subsystems send pull +requests to Linus for code they have been queuing up for the next +stable kernel. This is typically now done through respective +foo-next-2.6.git trees where foo is your subsystem. Each maintainer +queues up patches for the next kernel cycle in this foo-next-2.6.git +tree. After the merge window the kernel is worked on through the +rc-series of the kernel release. The merge window closes at the first +rc-series release. + +After a maintainer has sent his pull request to Linus during the merge +window no further new development will be accepted for that tree and +as such it marks the closure of development for that subsystem for that +kernel cycle. + +Developers wishing to target deadlines should simply work on their development +without regards or consideration for inclusion to a specific kernel release. +Once development is done it should simply be posted. If you insist on targeting +a kernel release for deadlines you can try to be aware of the current rc cycle +development and how soon it seems the next stable kernel release will be made. + +A good indication of when the next stable kernel release will be made is when +Linus notes the last rc cycle released may be the last. By this time you +should already have all your development done and merged in the respective +development tree. If your code is not ready and merged into the respective +maintainers tree prior to the announced last potential rc kernel release +chances are you missed getting your code in for the next kernel merge window. +Exemptions here are new drivers, covered below. + +2.0.2: RC-SERIES RULES + +This section summarizes what kind of patches are accepted before the merge +window closes and after it closes. These patches are targeted for the kernel +prior to its final release. + +The rc-series focus should really be to address regressions. + +2.0.2.0: RC-SERIES RULES PRIOR TO THE RC1 RELEASE + +These are the types of patches that will get accepted prior to a kernel rc1 release, +during the merge window: + + - it must fix a regression + - it must fix a security hole + - it must fix a oops/kernel hang + +Non-intrusive bug fixes or small fixes will not be accepted. If the patch in +question is for a driver that has been around for more than a kernel release, +then "small fixes" really can't be worth all that much. And "small fixes" may +be small and "obvious" they definitely can regress. + +When in doubt consult with your subsystem maintainer or just allow him to +do the judging of where the patches deserves to go to, a proper commit log +should help with this effort. + +2.0.2.1: RC-SERIES RULES AFTER THE RC1 RELEASE + +There are no more merges after the rc1 release. + +The same type of patches are accepted after the rc1 release with the addition +of non-intrusive bug fix patches. Non-intrusive bug fixes must be important +and address very clearly the bug they are fixing. Non-intrusive bug fixes +can fix issues which are not a regression, security hole or a kernel oops/hang. + +Non-intrusive bug fix patches will not be accepted late in the rc-series, after +the rc5, for example. + +You should not take it for granted non-intrusive bug fixes will always be accepted. +Ultimately it is up to the subsystem maintainers to decide whether to accept such a fix +or not, which is why your commit log entry is very important. You want to provide as +much detail as is posisible in order to help maintainers make the right call. + +2.0.3 RC-SERIES NEW DRIVER EXEMPTION RULE + +The very first release a new driver or filesystem is special. New drivers +are accepted during the rc series. Patches for the same driver then are +also accepted during the same rc series of a kernel as well as fixes for it +cannot regress as no previous kernels exists with it. + +Once drivers are upstream for one kernel release (say on 2.6.29) the target +*goal* after the merge window of the next kernel (respectively this would be +the 2.6.30 rc-series) is to address regressions. Kernel oops/hangs and security +issues are obviously accepted but the point is these should have also been +caught earlier as a general development goal. 2.1: THE BIG PICTURE The kernel developers use a loosely time-based release process, with a new -major kernel release happening every two or three months. The recent -release history looks like this: - - 2.6.26 July 13, 2008 - 2.6.25 April 16, 2008 - 2.6.24 January 24, 2008 - 2.6.23 October 9, 2007 - 2.6.22 July 8, 2007 - 2.6.21 April 25, 2007 - 2.6.20 February 4, 2007 +major kernel release happening about every two or three months. The current +average time based on the last 10 releases is 86.0 days. The recent release +history along with the number of days between each release looks like this: + + 2.6.30 June 10, 2009 - 78 days + 2.6.29 March 23, 2009 - 89 days + 2.6.28 December 29, 2008 - 76 days + 2.6.27 October 8, 2008 - 88 days + 2.6.26 July 13, 2008 - 88 days + 2.6.25 April 16, 2008 - 83 days + 2.6.24 January 24, 2008 - 108 days + 2.6.23 October 9, 2007 - 94 days + 2.6.22 July 8, 2007 - 75 days + 2.6.21 April 25, 2007 - 81 days + 2.6.20 February 4, 2007 - 68 Every 2.6.x release is a major kernel release with new features, internal API changes, and more. A typical 2.6 release can contain over 10,000 diff --git a/Documentation/stable_kernel_rules.txt b/Documentation/stable_kernel_rules.txt index a452227..113e8c8 100644 --- a/Documentation/stable_kernel_rules.txt +++ b/Documentation/stable_kernel_rules.txt @@ -1,5 +1,10 @@ Everything you ever wanted to know about Linux 2.6 -stable releases. +For further details, such as stable kernel release schedules, rc-series +policies and process of development please refer to: + +Documentation/development-process/ + Rules on what kind of patches are accepted, and which ones are not, into the "-stable" tree: -- 1.6.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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