From: Arnd Bergmann <[email protected]> [ Upstream commit 710ec38b0f633ab3e2581f07a73442d809e28ab0 ]
On kernels without CONFIG_MMU, we get a link error for the siw driver: 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. Link: http://lkml.kernel.org/r/[email protected] Fixes: 2251334dcac9 ("rdma/siw: application buffer management") Signed-off-by: Arnd Bergmann <[email protected]> Suggested-by: Jason Gunthorpe <[email protected]> Acked-by: Michal Hocko <[email protected]> Cc: Bernard Metzler <[email protected]> Cc: "Matthew Wilcox (Oracle)" <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Sasha Levin <[email protected]> --- include/linux/mm.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 0334ca97c584d..fe4552e1c40b4 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1405,7 +1405,11 @@ 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); +#else +static inline bool can_do_mlock(void) { return false; } +#endif extern int user_shm_lock(size_t, struct user_struct *); extern void user_shm_unlock(size_t, struct user_struct *); -- 2.20.1
