[PATCH] KVM: use folio_nr_pages() instead of shift operation

Pedro Demarchi Gomes
2025-10-04T03:09:17Z

folio_nr_pages() is a faster helper function to get the number of pages when
NR_PAGES_IN_LARGE_FOLIO is enabled.

Signed-off-by: Pedro Demarchi Gomes <pedrodemargomes@gmail.com>
---
virt/kvm/guest_memfd.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c
index 7d85cc33c0bb..5fc5475cf826 100644
--- a/virt/kvm/guest_memfd.c
+++ b/virt/kvm/guest_memfd.c
@@ -77,9 +77,9 @@ static int kvm_gmem_prepare_folio(struct kvm *kvm, struct kvm_memory_slot *slot,
* The order will be passed when creating the guest_memfd, and
* checked when creating memslots.
*/
- WARN_ON(!IS_ALIGNED(slot->gmem.pgoff, 1 << folio_order(folio)));
+ WARN_ON(!IS_ALIGNED(slot->gmem.pgoff, folio_nr_pages(folio)));
index = gfn - slot->base_gfn + slot->gmem.pgoff;
- index = ALIGN_DOWN(index, 1 << folio_order(folio));
+ index = ALIGN_DOWN(index, folio_nr_pages(folio));
r = __kvm_gmem_prepare_folio(kvm, slot, index, folio);
if (!r)
kvm_gmem_mark_prepared(folio);
--
2.39.5