[PATCH v3.1 4/6] mm/hugetlb: Allow architectures to override huge_pte_clear()

[Arnd Bergmann]

On Mon, May 22, 2017 at 6:25 PM, Punit Agrawal <punit.agrawal at arm.com> wrote:
> 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 <punit.agrawal at arm.com>
> Cc: Martin Schwidefsky <schwidefsky at de.ibm.com>
> Cc: Heiko Carstens <heiko.carstens at de.ibm.com>
> Cc: Arnd Bergmann <arnd at arndb.de>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>
> Cc: Mike Kravetz <mike.kravetz at oracle.com>

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