On Mon, Dec 29, 2025 at 07:35:18PM +0100, Christophe Leroy (CS GROUP) wrote:

Le 28/12/2025 à 23:35, Andrew Morton a écrit :

quoted

On Wed, 24 Dec 2025 17:25:24 +0530 Sourabh Jain [off-list ref] wrote:

quoted

Note for backporting: This fix is a partial retrieval of the commit
mentioned in the Fixes tag. It is only valid once the change referenced
by the Depends-on tag is present. When backporting this patch, the
commit mentioned in the Depends-on tag must be included first.

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Fixes: c2833a5bf75b ("hugetlbfs: fix changes to command line processing")
Depends-on: 2354ad252b66 ("powerpc/mm: Update default hugetlb size early")

This will be the first "Depends-on:" in history.  Which is a hint that
we're doing something wrong.  This innovation will surely fool any
downstream automation.  Let's use existing tools if possible.

What do you mean by "first in history" ? Do you mean it's never been 
used before ? As far as I can see it has been used several times 
already. First one was in 2014 with commit a0855054e59b ("iwlwifi: 
dvm: drop non VO frames when flushing")

Sasha, do tools use it ?

The standard way to annotate dependencies is outlined in the docs:

   To send additional instructions to the stable team, use a shell-style inline comment to pass arbitrary or predefined notes:

   Specify any additional patch prerequisites for cherry picking:

   Cc: [off-list ref] # 3.3.x: a1f84a3: sched: Check for idle
   Cc: [off-list ref] # 3.3.x: 1b9508f: sched: Rate-limit newidle
   Cc: [off-list ref] # 3.3.x: fd21073: sched: Fix affinity logic
   Cc: [off-list ref] # 3.3.x
   Signed-off-by: Ingo Molnar [off-list ref]

   The tag sequence has the meaning of:

   git cherry-pick a1f84a3
   git cherry-pick 1b9508f
   git cherry-pick fd21073
   git cherry-pick <this commit>

My tools don't look at Depends-on: and I don't think that Greg's tools do that
either.

-- 
Thanks,
Sasha