Re: [linux-next:master 12061/12283] mm/khugepaged.c:435:undefined reference to `shmem_hpage_pmd_enabled'

[Andrew Morton <akpm@linux-foundation.org>]

On Tue, 17 Sep 2024 19:36:47 +0800 kernel test robot <lkp@intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   4f3e012d4cfd1d9bf837870c961f462ca9f23ebe
> commit: 8b07e88e36961c4785dd13dbdbb5d7977b458940 [12061/12283] mm: shmem: fix khugepaged activation policy for shmem
> config: loongarch-randconfig-s042-20221209 (https://download.01.org/0day-ci/archive/20240917/202409171905.9gqKNeeL-lkp@intel.com/config)
> compiler: loongarch64-linux-gcc (GCC) 13.3.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240917/202409171905.9gqKNeeL-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202409171905.9gqKNeeL-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    loongarch64-linux-ld: mm/khugepaged.o: in function `hugepage_pmd_enabled':
> >> mm/khugepaged.c:435:(.text+0x2338): undefined reference to `shmem_hpage_pmd_enabled'

Thanks.  I think this:

From: Andrew Morton <akpm@linux-foundation.org>
Subject: mm-shmem-fix-khugepaged-activation-policy-for-shmem-fix
Date: Tue Sep 17 05:06:48 AM PDT 2024

fix build with CONFIG_SHMEM=n

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409171905.9gqKNeeL-lkp@intel.com/
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/shmem_fs.h |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/include/linux/shmem_fs.h~mm-shmem-fix-khugepaged-activation-policy-for-shmem-fix
+++ a/include/linux/shmem_fs.h
@@ -114,7 +114,6 @@ int shmem_unuse(unsigned int type);
 unsigned long shmem_allowable_huge_orders(struct inode *inode,
 				struct vm_area_struct *vma, pgoff_t index,
 				loff_t write_end, bool shmem_huge_force);
-bool shmem_hpage_pmd_enabled(void);
 #else
 static inline unsigned long shmem_allowable_huge_orders(struct inode *inode,
 				struct vm_area_struct *vma, pgoff_t index,
@@ -123,6 +122,11 @@ static inline unsigned long shmem_allowa
 	return 0;
 }
 
+#endif
+
+#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && defined(SHMEM)
+bool shmem_hpage_pmd_enabled(void);
+#else
 static inline bool shmem_hpage_pmd_enabled(void)
 {
 	return false;
_