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'
Since all user access for all of our drivers depend on remapping pages to
user space disable USER_ACCESS when there is no mmu.
Fixes: 5f9794dc94f5 ("RDMA/ucontext: Add a core API for mmaping driver IO memory")
Reported-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
---
drivers/infiniband/Kconfig | 1 +
1 file changed, 1 insertion(+)
Here is the revised version of Arnd's earlier patch, as requested.
diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index abb6660c099c9f..0a3ec7c726ec20 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -26,6 +26,7 @@ config INFINIBAND_USER_MAD
config INFINIBAND_USER_ACCESS
tristate "InfiniBand userspace access (verbs and CM)"
select ANON_INODES
+ depends on MMU
---help---
Userspace InfiniBand access support. This enables the
kernel side of userspace verbs and the userspace
--
2.19.0
