swiotlb_sync_sg_for_cpu 31 arch/x86/kernel/pci-swiotlb_64.c .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, swiotlb_sync_sg_for_cpu 28 include/asm-x86/swiotlb.h extern void swiotlb_sync_sg_for_cpu(struct device *hwdev,