On Thu, 2016-09-22 at 16:58 +0200, Pablo Neira Ayuso wrote:
> attributes")
> Always use 12 bytes commit-ids. 4da449a is too short, given the number
> of changes we're getting in the kernel tree, this may become ambiguous
> at some point so it won't be unique.
> You can achieve this via: git log --oneline --abbrev=12

and Documentation/SubmittingPatches has these tips :

You should also be sure to use at least the first twelve characters of the
SHA-1 ID.  The kernel repository holds a *lot* of objects, making
collisions with shorter IDs a real possibility.  Bear in mind that, even if
there is no collision with your six-character ID now, that condition may
change five years from now.

If your patch fixes a bug in a specific commit, e.g. you found an issue using
git-bisect, please use the 'Fixes:' tag with the first 12 characters of the
SHA-1 ID, and the one line summary.  For example:

        Fixes: e21d2170f366 ("video: remove unnecessary platform_set_drvdata()")

The following git-config settings can be used to add a pretty format for
outputting the above style in the git log or git show commands

                abbrev = 12
                fixes = Fixes: %h (\"%s\")

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