Linus prefers that we backmerge a specific tag instead of a random
point in his branch. Allow that.

I guess it'd be nice to somehow figure out where a tag came from, but
git doesn't namespace tags. So that idea is out of the window
unfortunately.

v2: Unlazy and also update the docs.

Requested-by: Dave Airlie <[email protected]>
Cc: Dave Airlie <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
---
 dim     | 4 +++-
 dim.rst | 3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/dim b/dim
index e477d043458b..d4a1efc50d2a 100755
--- a/dim
+++ b/dim
@@ -1011,7 +1011,9 @@ function dim_backmerge
        upstream=${2:?$usage}
 
        if ! dim_list_upstreams | grep -q "^$upstream\$"; then
-               warn_or_fail "$upstream is not an upstream branch"
+               if ! git rev-parse --verify -q "refs/tags/$upstream" > 
/dev/null ; then
+                       warn_or_fail "$upstream is neither an upstream branch 
nor a tag"
+               fi
        fi
 
        cd $DIM_PREFIX/drm-tip
diff --git a/dim.rst b/dim.rst
index a99e40678a2f..ed784fe20913 100644
--- a/dim.rst
+++ b/dim.rst
@@ -335,7 +335,8 @@ backmerge *branch* *upstream*
 
 Backmerges *upstream* into *branch*, making a few sanity checks on the way. The
 *upstream* we backmerge should be the same as used for sending out pull 
requests
-using **pull-request**.
+using **pull-request**. Alternatively it can also be a tag, which if available
+should be preferred.
 
 update-next
 -----------
-- 
2.18.0

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