On Sat, 21 Aug 2021 16:19:31 -0700, daniel watson said: > On Sat, Aug 21, 2021 at 12:30:27AM -0700, daniel watson wrote: > > Documentation/process/submitting-patches.rst says to see the T: entry > > for the subsystem in MAINTAINERS to find the right tree to base the > > patch on. If there's no better entry listed in a T:, the linux-next tree is a good default. Failing that, a recent pull of Linus's tree is usually OK (though can cause issues with conflicts if other people are working on the area and their patches are in linux-next already). Since the linux-next tree is rebuild every day, it's usually only 24 hours or so behind the 200+ maintainer trees that feed it. The quick cheat sheet for linux-next: $ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git $ git remote add linux-next git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git $ git fetch linux-next $ git fetch --tags linux-next ... # later on $ git remote update $ git checkout next-20210820 (or whatever the one you want is) Don't use 'git pull' against a linux-next tree, as it won't do what you want, use 'remote update'. (The gory details - it rebases every day due to the way it is built) Also, you can bisect between a 'next-20210605' tag and a Linus 'v5.13-rc3' type tag, but bisecting between two 'next-mmm' tags will fail, for the same reasons that git pull will blow chunks. > > in addition, how do i know what branch to use? the T: entries have a > > repo, but not a branch name. You want it pointing at master/HEAD unless you have a *damned* good reason to use something else (usually "maintainer specifically told you to use a different branch") > the output of > > git log --oneline -1 <path> > > should have the subsystem listed at the beginning. Actually, it's not *necessarily* 'subsystem' - it's "what the tree maintainer wants as the start of the Subject: line", which can sometimes be different.
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