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Create a branch in each repository that you need to change. For example, if your fix requires changes in both the jdk and hotspot repos, you could do this:

$ #From# From the root of your local forest
$ hg -R hotspot branch "JDK-7000001"
$ hg -R jdk branch "JDK-7000001"

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How do I update my branch with the latest upstream changes?

$ # From local forest
$ hg tpull # make sure the default branch has latest changes
$ hg update xxx  # make sure you are sitting on your branch head tbranch?
$ hg merge default #tmerge
$ hg commit -m "Merge"#tcommit

How should I push a branch?

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