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Subject[PATCH] mm: add dummy can_do_mlock() helper
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'

This is probably not the only driver that needs the function
and could otherwise build correctly without CONFIG_MMU, so
add a dummy variant that always returns false.

Fixes: 2251334dcac9 ("rdma/siw: application buffer management")
Suggested-by: Jason Gunthorpe <>
Signed-off-by: Arnd Bergmann <>
include/linux/mm.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 66f296181bcc..cc292273e6ba 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1424,7 +1424,11 @@ extern void pagefault_out_of_memory(void);

extern void show_free_areas(unsigned int flags, nodemask_t *nodemask);

+#ifdef CONFIG_MMU
extern bool can_do_mlock(void);
+static inline bool can_do_mlock(void) { return false; }
extern int user_shm_lock(size_t, struct user_struct *);
extern void user_shm_unlock(size_t, struct user_struct *);

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