mm/page_table_check: fix accessing unmapped ptep

ptep is unmapped too early, so ptep could theoretically be accessed while
it's unmapped.  This might become a problem if/when CONFIG_HIGHPTE becomes
available on riscv.

Fix it by deferring pte_unmap() until page table checking is done.

[[email protected]: account for ptep alteration, per Matthew]
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 80110bbfbba6 ("mm/page_table_check: check entries at pmd levels")
Signed-off-by: Miaohe Lin <[email protected]>
Acked-by: Pasha Tatashin <[email protected]>
Cc: Qi Zheng <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: David Rientjes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions