[bellerocky]

Reverting a merge is totally OK if you kept your history clean and rebased the branch you're merging into to get updates instead of merging it into your branch.

Like if you created a new branch from master and you have been merging master into your branch to get updates in master, once you merge your branch into master you cannot revert this merge because the act of merging master into your branch changed which branch owned commits.

If you rebased master into your branch instead everything will be fine. If you merge your branch into master, reverting that merge will simply undo the merge as you expected.