* Understanding merge window and next-tree
@ 2021-09-10 16:06 Lafan Mining
2021-09-11 8:16 ` Greg KH
2021-09-11 8:40 ` Bernd Petrovitsch
0 siblings, 2 replies; 3+ messages in thread
From: Lafan Mining @ 2021-09-10 16:06 UTC (permalink / raw)
To: kernelnewbies
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I'm trying to understand how Linux Kernel development works and reading the relevant documentation at https://www.kernel.org/doc/html/latest/process/2.Process.html
So there is the so called next-tree accumulating all the patches from all the subsystems ready for merge and the mainline tree. The thing is the merge-window is opened for 2 weeks (as mentioned in the linked documentation) and as far as I understood all the changes will be merged into the mainline.
But looking through the next-tree I found some implementation in Rust https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/rust which is much older than 2 months.
How is that happened that after a few merge windows (4 if I counted correctly) it's still not merged?
Thank you!
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* Re: Understanding merge window and next-tree
2021-09-10 16:06 Understanding merge window and next-tree Lafan Mining
@ 2021-09-11 8:16 ` Greg KH
2021-09-11 8:40 ` Bernd Petrovitsch
1 sibling, 0 replies; 3+ messages in thread
From: Greg KH @ 2021-09-11 8:16 UTC (permalink / raw)
To: Lafan Mining; +Cc: kernelnewbies
On Fri, Sep 10, 2021 at 04:06:39PM +0000, Lafan Mining wrote:
> I'm trying to understand how Linux Kernel development works and reading the relevant documentation at https://www.kernel.org/doc/html/latest/process/2.Process.html
>
> So there is the so called next-tree accumulating all the patches from all the subsystems ready for merge and the mainline tree. The thing is the merge-window is opened for 2 weeks (as mentioned in the linked documentation) and as far as I understood all the changes will be merged into the mainline.
>
> But looking through the next-tree I found some implementation in Rust https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/rust which is much older than 2 months.
>
> How is that happened that after a few merge windows (4 if I counted correctly) it's still not merged?
Maintainers have to ask Linus to take their changes and be merged, Linus
does not directly merge from linux-next. This allows for maintainers to
"skip" merge windows if needed, as well as have things in linux-next for
a long time before they go to Linus for various reasons (the -mm tree
has many such patches, and so does the rust tree as you have seen.)
So yes, the requirement is that changes have to be in linux-next before
it goes into Linus's tree, but it does not guarantee that anything is in
linux-next will end up in Linus's tree.
Does that help?
greg k-h
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* Re: Understanding merge window and next-tree
2021-09-10 16:06 Understanding merge window and next-tree Lafan Mining
2021-09-11 8:16 ` Greg KH
@ 2021-09-11 8:40 ` Bernd Petrovitsch
1 sibling, 0 replies; 3+ messages in thread
From: Bernd Petrovitsch @ 2021-09-11 8:40 UTC (permalink / raw)
To: Lafan Mining, kernelnewbies
Hi all!
On 10/09/2021 18:06, Lafan Mining wrote:
> I'm trying to understand how Linux Kernel development works and reading
> the relevant documentation
> at https://www.kernel.org/doc/html/latest/process/2.Process.html
> <https://www.kernel.org/doc/html/latest/process/2.Process.html>
>
> So there is the so called next-tree accumulating all the patches from
> all the subsystems ready for merge and the mainline tree. The thing is
> the merge-window is opened for 2 weeks (as mentioned in the linked
> documentation) and as far as I understood all the changes will be merged
> into the mainline.
The main purpose of the -next tree is to identify (and solve) merge
issues (way) before the merge window so that there is less stress and
chaos in the merge window.
MfG,
Bernd
--
Bernd Petrovitsch Email : bernd@petrovitsch.priv.at
There is NO CLOUD, just other people's computers. - FSFE
LUGA : http://www.luga.at
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