[PATCH] RDMA/ucontext: fix building with CONFIG_MMU=n

[Arnd Bergmann]

The zap_vma_ptes() is declared but not defined on NOMMU kernels,
causing a link error for the newly added uverbs code:

drivers/infiniband/core/uverbs_main.o: In function 
`uverbs_user_mmap_disassociate':
uverbs_main.c:(.text+0x114c): undefined reference to `zap_vma_ptes'
drivers/infiniband/core/uverbs_main.o: In function `rdma_umap_open':
uverbs_main.c:(.text+0x53c): undefined reference to `zap_vma_ptes'

To fix this, we can either make uverbs depend on CONFIG_MMU, or try
to build it anyway. Since this is the only compile-time dependency,
I decided to allow building it with an extra compile-time check for
CONFIG_MMU before calling the one function.

Fixes: 5f9794dc94f5 ("RDMA/ucontext: Add a core API for mmaping driver IO 
memory")
Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 drivers/infiniband/core/uverbs_main.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/core/uverbs_main.c 
b/drivers/infiniband/core/uverbs_main.c
index 40dcf3d02a4b..5c1202af0748 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -884,7 +884,8 @@ static void rdma_umap_open(struct vm_area_struct *vma)
         * point, so zap it.
         */
        vma->vm_private_data = NULL;
-       zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
+       if (IS_ENABLED(CONFIG_MMU))
+               zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
 }
 
 static void rdma_umap_close(struct vm_area_struct *vma)
@@ -1023,8 +1024,9 @@ void uverbs_user_mmap_disassociate(struct ib_uverbs_file 
*ufile)
                                continue;
                        list_del_init(&priv->list);
 
-                       zap_vma_ptes(vma, vma->vm_start,
-                                    vma->vm_end - vma->vm_start);
+                       if (IS_ENABLED(CONFIG_MMU))
+                               zap_vma_ptes(vma, vma->vm_start,
+                                            vma->vm_end - vma->vm_start);
                        vma->vm_flags &= ~(VM_SHARED | VM_MAYSHARE);
                }
                mutex_unlock(&ufile->umap_lock);
-- 
2.18.0