[Linaro-mm-sig] Re: [PATCH rdma-next 2/2] RDMA/mlx5: Implement DMABUF export ops

On Thu, Jan 08, 2026 at 01:11:15PM +0200, Edward Srouji wrote:

+static int phys_addr_to_bar(struct pci_dev *pdev, phys_addr_t pa) +{

• resource_size_t start, end;
• int bar;
• for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {

• /* Skip BARs not present or not memory-mapped */
  

• if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM))
  

• 	continue;
  

• start = pci_resource_start(pdev, bar);
  

• end = pci_resource_end(pdev, bar);
  

• if (!start || !end)
  

• 	continue;
  

• if (pa >= start && pa <= end)
  

• 	return bar;
  

• }

Don't we know which of the two BARs the mmap entry came from based on its type? This seems like overkill..

Jason