[PATCH v5 6/6] KVM: PPC: use vma_start_write_killable() in kvmppc_memslot_page_merge()

[Suren Baghdasaryan]

Replace vma_start_write() with vma_start_write_killable(), improving
reaction time to the kill signal.
Replace vma_start_write() in kvmppc_memslot_page_merge().

Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@xxxxxxxxxx>
---
 arch/powerpc/kvm/book3s_hv_uvmem.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/kvm/book3s_hv_uvmem.c b/arch/powerpc/kvm/book3s_hv_uvmem.c
index 5fbb95d90e99..0a28b48a46b8 100644
--- a/arch/powerpc/kvm/book3s_hv_uvmem.c
+++ b/arch/powerpc/kvm/book3s_hv_uvmem.c
@@ -410,7 +410,10 @@ static int kvmppc_memslot_page_merge(struct kvm *kvm,
 			ret = H_STATE;
 			break;
 		}
-		vma_start_write(vma);
+		if (vma_start_write_killable(vma)) {
+			ret = H_STATE;
+			break;
+		}
 		/* Copy vm_flags to avoid partial modifications in ksm_madvise */
 		vm_flags = vma->vm_flags;
 		ret = ksm_madvise(vma, vma->vm_start, vma->vm_end,
-- 
2.53.0.1018.g2bb0e51243-goog