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Subject[PATCH] rdma/siw: fix NOMMU build
On kernels without CONFIG_MMU, we get a link error for the siw

drivers/infiniband/sw/siw/siw_mem.o: In function `siw_umem_get':
siw_mem.c:(.text+0x4c8): undefined reference to `can_do_mlock'

I don't know whether this driver is able to work at all without
an MMU, but it's easy to avoid the link problem by adding another
compile-time check.

Fixes: 2251334dcac9 ("rdma/siw: application buffer management")
Signed-off-by: Arnd Bergmann <>
drivers/infiniband/sw/siw/siw_mem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/sw/siw/siw_mem.c b/drivers/infiniband/sw/siw/siw_mem.c
index e99983f07663..b3b614c07fdb 100644
--- a/drivers/infiniband/sw/siw/siw_mem.c
+++ b/drivers/infiniband/sw/siw/siw_mem.c
@@ -374,7 +374,7 @@ struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable)
unsigned int foll_flags = FOLL_WRITE;
int num_pages, num_chunks, i, rv = 0;

- if (!can_do_mlock())
+ if (!IS_ENABLED(CONFIG_MMU) || !can_do_mlock())
return ERR_PTR(-EPERM);

if (!len)
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