xen/p2m: avoid unneccesary TLB flush in m2p_remove_override()

In m2p_remove_override() when removing the grant map from the kernel
mapping and replacing with a mapping to the original page, the grant
unmap will already have flushed the TLB and it is not necessary to do
it again after updating the mapping.

Signed-off-by: David Vrabel <[e-mail]>
Cc: Stefano Stabellini <[e-mail]>
Signed-off-by: Konrad Rzeszutek Wilk <[e-mail]>
Reviewed-by: Stefano Stabellini <[e-mail]>

arch/x86/xen/p2m.c

···
 
 			set_pte_at(&init_mm, address, ptep,
 					pfn_pte(pfn, PAGE_KERNEL));
-			__flush_tlb_single(address);
 			kmap_op->host_addr = 0;
 		}
 	}