Merge branch 'fix-late-dma-unmap-crash-for-page-pool'

Toke Høiland-Jørgensen says:

====================
Fix late DMA unmap crash for page pool

This series fixes the late dma_unmap crash for page pool first reported
by Yonglong Liu in [0]. It is an alternative approach to the one
submitted by Yunsheng Lin, most recently in [1]. The first commit just
wraps some tests in a helper function, in preparation of the main change
in patch 2. See the commit message of patch 2 for the details.

[0] https://lore.kernel.org/[email protected]
[1] https://lore.kernel.org/[email protected]

v8: https://lore.kernel.org/[email protected]
v7: https://lore.kernel.org/[email protected]
v6: https://lore.kernel.org/[email protected]
v5: https://lore.kernel.org/[email protected]
v4: https://lore.kernel.org/[email protected]
v3: https://lore.kernel.org/[email protected]
v2: https://lore.kernel.org/[email protected]
v1: https://lore.kernel.org/[email protected]
====================

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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