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Shutemov" , Andrew Morton , Linus Torvalds , Sasha Levin Subject: [PATCH 5.3 120/166] mm: add dummy can_do_mlock() helper Date: Sun, 6 Oct 2019 19:21:26 +0200 Message-Id: <20191006171223.408924054@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191006171212.850660298@linuxfoundation.org> References: <20191006171212.850660298@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Arnd Bergmann [ 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 Suggested-by: Jason Gunthorpe Acked-by: Michal Hocko Cc: Bernard Metzler Cc: "Matthew Wilcox (Oracle)" Cc: "Kirill A. Shutemov" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- include/linux/mm.h | 4 ++++ 1 file changed, 4 insertions(+) -- 2.20.1 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 *);