Re: [PATCH RESEND v3 0/4] mm/hugetlb: fixes for PMD table sharing (incl. using mmu_gather)

[David Hildenbrand (Red Hat)]

On 1/15/26 19:05, Andrew Morton wrote:
> On Thu, 15 Jan 2026 17:22:30 +0000 Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx> wrote:
>
> > Any update on this series? It's a hotfix series and I don't see it queued
> > up anywhere in either mm-hotfixes-unstable or mm-hotfixes-stable, this
> > issue is causing ongoing problems for a lot of people, is there any reason
> > it's being delayed?
> >
> > It's received extensive approval and testing, so should be GTG right?
>
> This has been in mm-unstable for a long time.  As the series had a
> mixture of cc:stable and not-cc:stable patches, I figured we'd merge
> them all into next merge window and let the -stable maintainers figure
> it all out.
>
> As this is more urgent than I believed, we need to figure out what to
> do.
>
> a) Pluck out the two cc:stable patches, merge just those into 6.19-rc.
>
> b) Merge all of them into 6.19-rc, let -stable maintainers figure it out

Right. We can just CC: stable on comment fixes #2 and #3 to make 
back-porting easier.

> c) Stick with my original plan.
>
> <checks>
>
> The cc:stable "mm/hugetlb: fix excessive IPI broadcasts when unsharing
> PMD tables using mmu_gather" has dependencies on the preceding two
> non-cc:stable patches.

At least one of them (doc update), yes.

> So I'm thinking I add cc:stable to everything and send the whole series
> into 6.19-rcX.  wdyt?

Works for me.

> Also, David, where do we stand with
>
> : I'd love to get some generic hugetlb testing on arm64 and powerpc,
> : that do hugetlb TLB flushing stuff a bit more special.
> :
> : I'll try doing some arm64 testing early in the new year myself.
>
> ?

Not done yet, unfortunately. (I don't (yet) have easy access to decent 
arm64 hardware ;) )

I still hope that Jann could quickly have a look, but it's been a while 
already since I posted v1.

--
Cheers

David