On Mon, 19 Feb 2018 02:45:27 +0800 kbuild test robot <lkp@xxxxxxxxx> wrote: > [auto build test ERROR on mmotm/master] > [also build test ERROR on v4.16-rc1 next-20180216] > [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] > > url: https://github.com/0day-ci/linux/commits/Juergen-Gross/mm-don-t-defer-struct-page-initialization-for-Xen-pv-guests/20180218-233657 > base: git://git.cmpxchg.org/linux-mmotm.git master > config: i386-randconfig-x010-201807 (attached as .config) > compiler: gcc-7 (Debian 7.3.0-1) 7.3.0 > reproduce: > # save the attached .config to linux build tree > make ARCH=i386 > > All errors (new ones prefixed by >>): > > mm/page_alloc.c: In function 'update_defer_init': > >> mm/page_alloc.c:352:6: error: implicit declaration of function 'xen_pv_domain' [-Werror=implicit-function-declaration] > if (xen_pv_domain()) > ^~~~~~~~~~~~~ I think I already fixed this. From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Subject: mm-dont-defer-struct-page-initialization-for-xen-pv-guests-fix explicitly include xen.h Cc: Juergen Gross <jgross@xxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 1 + 1 file changed, 1 insertion(+) diff -puN mm/page_alloc.c~mm-dont-defer-struct-page-initialization-for-xen-pv-guests-fix mm/page_alloc.c --- a/mm/page_alloc.c~mm-dont-defer-struct-page-initialization-for-xen-pv-guests-fix +++ a/mm/page_alloc.c @@ -46,6 +46,7 @@ #include <linux/stop_machine.h> #include <linux/sort.h> #include <linux/pfn.h> +#include <xen/xen.h> #include <linux/backing-dev.h> #include <linux/fault-inject.h> #include <linux/page-isolation.h> _