Arnd Bergmann [off-list ref] writes:

On Mon, May 22, 2017 at 6:25 PM, Punit Agrawal [off-list ref] wrote:

quoted

When unmapping a hugepage range, huge_pte_clear() is used to clear the
page table entries that are marked as not present. huge_pte_clear()
internally just ends up calling pte_clear() which does not correctly
deal with hugepages consisting of contiguous page table entries.

Add a size argument to address this issue and allow architectures to
override huge_pte_clear() by wrapping it in a #ifndef block.

Update s390 implementation with the size parameter as well.

Note that the change only affects huge_pte_clear() - the other generic
hugetlb functions don't need any change.

Signed-off-by: Punit Agrawal <redacted>
Cc: Martin Schwidefsky <redacted>
Cc: Heiko Carstens <redacted>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Aneesh Kumar K.V" <redacted>
Cc: Mike Kravetz <redacted>

Acked-by: Arnd Bergmann <arnd@arndb.de>

Thanks, Arnd. I've applied the tag locally.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo at kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email at kvack.org </a>