SGL_SIZE
free_pages((unsigned long)ctx->sgl, get_order(SGL_SIZE));
BUILD_BUG_ON(sizeof(struct pvscsi_sg_list) > SGL_SIZE);
get_order(SGL_SIZE));
get_order(SGL_SIZE));
ctx->sgl, SGL_SIZE, DMA_TO_DEVICE);
SGL_SIZE, DMA_TO_DEVICE);