Re: [PATCH v4 14/19] mm/hugetlb: Free cross-zone bootmem gigantic pages after allocation

On Fri, Jun 12, 2026 at 11:58:58AM +0800, Muchun Song wrote:

Now that hugetlb reservation runs after zone initialization, bootmem
gigantic page allocation can detect pages that span multiple zones.

Keep those cross-zone pages separate during allocation and free them
after allocation completes, so later hugetlb initialization only sees
zone-valid gigantic pages.

This chooses to free cross-zone gigantic pages directly instead of
retrying allocation. In practice, such cross-zone cases are expected to
be very rare, so adding retry logic does not seem justified at this
point. Keeping the handling simple also preserves the previous behavior.
If similar real-world reports show up later, retry support can be
reconsidered then.

Signed-off-by: Muchun Song <redacted>

Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

---
 mm/hugetlb.c | 75 ++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 64 insertions(+), 11 deletions(-)

-- 
Sincerely yours,
Mike.