linux-kernel - Re: [PATCH] mm: don't defer struct page initialization for Xen pv guests

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Date:   Tue, 20 Feb 2018 15:21:48 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kbuild test robot <lkp@...el.com>
Cc:     Juergen Gross <jgross@...e.com>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        xen-devel@...ts.xenproject.org, mhocko@...e.com,
        stable@...r.kernel.org
Subject: Re: [PATCH] mm: don't defer struct page initialization for Xen pv
 guests

On Mon, 19 Feb 2018 02:45:27 +0800 kbuild test robot <lkp@...el.com> 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@...ux-foundation.org>
Subject: mm-dont-defer-struct-page-initialization-for-xen-pv-guests-fix

explicitly include xen.h

Cc: Juergen Gross <jgross@...e.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 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>
_