PCI/P2PDMA: Fix build without DMA ops

My commit to make DMA ops support optional missed the reference in
the p2pdma code.  And while the build bot didn't manage to find a config
where this can happen, Matthew did.  Fix this by replacing two IS_ENABLED
checks with ifdefs.

Fixes: 2f9237d4f6df ("dma-mapping: make support for dma ops optional")
Link: https://lore.kernel.org/r/20200810124843.1532738-1-hch@lst.de
Reported-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>

diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index 64ebed1..f357f9a 100644 (file)
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -556,13 +556,14 @@ int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients,
                return -1;
 
        for (i = 0; i < num_clients; i++) {
-               if (IS_ENABLED(CONFIG_DMA_VIRT_OPS) &&
-                   clients[i]->dma_ops == &dma_virt_ops) {
+#ifdef CONFIG_DMA_VIRT_OPS
+               if (clients[i]->dma_ops == &dma_virt_ops) {
                        if (verbose)
                                dev_warn(clients[i],
                                         "cannot be used for peer-to-peer DMA because the driver makes use of dma_virt_ops\n");
                        return -1;
                }
+#endif
 
                pci_client = find_parent_pci_dev(clients[i]);
                if (!pci_client) {
@@ -842,9 +843,10 @@ static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap,
         * this should never happen because it will be prevented
         * by the check in pci_p2pdma_distance_many()
         */
-       if (WARN_ON_ONCE(IS_ENABLED(CONFIG_DMA_VIRT_OPS) &&
-                        dev->dma_ops == &dma_virt_ops))
+#ifdef CONFIG_DMA_VIRT_OPS
+       if (WARN_ON_ONCE(dev->dma_ops == &dma_virt_ops))
                return 0;
+#endif
 
        for_each_sg(sg, s, nents, i) {
                paddr = sg_phys(s);