On Fri, 30 Oct 2026 05:37:36 +0530, Ritesh Harjani (IBM) wrote:
> Unmapping a device-dax mapping with 1G alignment on powerpc radix kernel
> built with CONFIG_DEBUG_VM triggers this warning on every munmap:
>
> WARNING: mm/mmu_gather.c:176 at __tlb_remove_folio_pages_size+0x38/0x230
> NIP [c00000000063d508] __tlb_remove_folio_pages_size+0x38/0x230
> LR [c0000000006fb688] zap_huge_pud+0x1b8/0x2d0
> Call Trace:
> zap_huge_pud+0x170/0x2d0 (unreliable)
> __zap_vma_range+0x1604/0x1e20
> unmap_vmas+0xa0/0x1f0
> unmap_region+0xb0/0x130
> vms_complete_munmap_vmas+0x120/0x310
> do_vmi_align_munmap+0x1ec/0x240
> __vm_munmap+0x148/0x220
> sys_munmap+0x28/0x40
>
> [...]
Applied, thanks!
tree: mm/core.git
branch: for-next-fixes
Applied patches will appear soon in mm-next, followed by linux-next.
Please report any outstanding bugs that were missed during review, so we
can either drop the patch series or decide how to fix it up.
It is encouraged to provide Acked-bys, Reviewed-bys, and Tested-bys even
though the patches have already been applied. If possible, patch trailers
will be updated.
Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. Further, this is not a guarantee that the
patches will go upstream. If in doubt, please check the listed branch.
[1/1] mm/huge_memory: set the mmu_gather page size in zap_huge_pud()
https://git.kernel.org/mm/core/c/0ba86a16
--
Cheers,
David
