Differential D20012

[PPC64] Fix wrong KASSERT in mphyp_pte_insert()
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Authored by luporl on Apr 22 2019, 5:29 PM.

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jhibbits

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rS346600: [PPC64] Fix wrong KASSERT in mphyp_pte_insert()

Summary

As mphyp_pte_unset() can also remove PTE entries, and as this can
happen in parallel with PTEs evicted by mphyp_pte_insert(), there
is a (rare) chance the PTE being evicted gets removed before
mphyp_pte_insert() is able to do so. Thus, the KASSERT should
check wether the result is H_SUCCESS or H_NOT_FOUND, to avoid
panics if the situation described above occurs.

More details about this issue can be found in PR 237470.