[PATCH v3 1/3] mm/hugetlb: Make hugetlb_reserve_pages() return nr of entries updated

[Andrew Morton]

On Fri, 6 Jun 2025 06:14:06 +0000 "Kasireddy, Vivek" <vivek.kasireddy at intel.com> wrote:

> > Also, patch [2/3] addresses a BUG which was introduced into 6.12.
> > Presumably we want to backport the fix into -stable?  If so, it's
> > better to present this as a standalone patch, including the cc:stable
> > tag.  This is because I'd be looking to fast-track the fix into the
> > 6.16-rcX cycle whereas less urgent things would be routed into
> > 6.17-rc1.
> Unless I merge patches #1 and #2, I don't think I can come up with a
> standalone fix to address the BUG. So, I don't mind having this short
> series deferred until 6.17-rc1.

If I understand correctly, we have a way in which unprivileged
userspace can trigger a BUG.  Unless we're very lucky, this wrecks the
running kernel.  So fixing this in shipped kernels is very important.

So if I indeed understand correctly, please try to find a minimal fix
which is suitable for backporting and then, as a separate series,
propose any changes which you think would improve things going forward.

Thanks.