linux-kernel - Re: [akpm-mm:mm-unstable 154/159] mm/memory-failure.c:1538:9: error: implicit declaration of function 'hugetlb_set_page

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Date:   Fri, 3 Jun 2022 02:10:43 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     kernel test robot <lkp@...el.com>
CC:     "kbuild-all@...ts.01.org" <kbuild-all@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [akpm-mm:mm-unstable 154/159] mm/memory-failure.c:1538:9: error:
 implicit declaration of function 'hugetlb_set_page_hwpoison'

On Fri, Jun 03, 2022 at 08:27:50AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
> head:   1bdf44dbc966e31c635199d413ee064a7d320844
> commit: d4edf38ab95397f32ae017848deeeb3b6d2c5bb7 [154/159] mm, hwpoison, hugetlb: introduce SUBPAGE_INDEX_HWPOISON to save raw error page
> config: x86_64-kexec (https://download.01.org/0day-ci/archive/20220603/202206030829.0eS2kZa0-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
> reproduce (this is a W=1 build):
>         # https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?id=d4edf38ab95397f32ae017848deeeb3b6d2c5bb7
>         git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
>         git fetch --no-tags akpm-mm mm-unstable
>         git checkout d4edf38ab95397f32ae017848deeeb3b6d2c5bb7
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>

Thank you!

> 
> All errors (new ones prefixed by >>):
> 
>    mm/memory-failure.c: In function '__get_huge_page_for_hwpoison':
> >> mm/memory-failure.c:1538:9: error: implicit declaration of function 'hugetlb_set_page_hwpoison' [-Werror=implicit-function-declaration]
>     1538 |         hugetlb_set_page_hwpoison(head, page);
>          |         ^~~~~~~~~~~~~~~~~~~~~~~~~
>    cc1: some warnings being treated as errors

__get_huge_page_for_hwpoison() is not needed when CONFIG_HUGETLB_PAGE is n,
so extending "#ifdef CONFIG_HUGETLB_PAG" to cover __get_huge_page_for_hwpoison()
would be a simple resolution.


diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index ced033a99e19..31d7eff35acf 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1501,6 +1501,7 @@ static int try_to_split_thp_page(struct page *page, const char *msg)
 	return 0;
 }
 
+#ifdef CONFIG_HUGETLB_PAGE
 /*
  * Called from hugetlb code with hugetlb_lock held.
  *
@@ -1550,7 +1551,6 @@ int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
 	return ret;
 }
 
-#ifdef CONFIG_HUGETLB_PAGE
 /*
  * Taking refcount of hugetlb pages needs extra care about race conditions
  * with basic operations like hugepage allocation/free/demotion.

Thanks,
Naoya Horiguchi