From: Jason Gunthorpe <jgg@mellanox.com>
Date: Fri, 28 Sep 2018 15:20:23 -0600
Subject: RDMA: Fix building with CONFIG_MMU=n
Patch-mainline: v4.20-rc1
Git-commit: 914e5d7d4697fb9815fa237a4d42bfb952bf48d6
References: bsc#1103992 FATE#326009
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@arndb.de>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/Kconfig | 1 +
1 file changed, 1 insertion(+)
--- 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