From: Arnd Bergmann arnd@arndb.de
[ 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/20190909204201.931830-1-arnd@arndb.de Fixes: 2251334dcac9 ("rdma/siw: application buffer management") Signed-off-by: Arnd Bergmann arnd@arndb.de Suggested-by: Jason Gunthorpe jgg@mellanox.com Acked-by: Michal Hocko mhocko@suse.com Cc: Bernard Metzler bmt@zurich.ibm.com Cc: "Matthew Wilcox (Oracle)" willy@infradead.org Cc: "Kirill A. Shutemov" kirill.shutemov@linux.intel.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 *);