linux-kernel - Re: [linux-next:master 12548/12775] mm/hugetlb.c:6835:6: sparse: sparse: symbol '__hugetlb_vma_unlock_write_put' was not declared. Should it be static?

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Date:   Fri, 7 Oct 2022 19:24:46 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     kernel test robot <lkp@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Muchun Song <songmuchun@...edance.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [linux-next:master 12548/12775] mm/hugetlb.c:6835:6: sparse:
 sparse: symbol '__hugetlb_vma_unlock_write_put' was not declared. Should it
 be static?

On 10/08/22 05:00, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   082fce125e57cff60687181c97f3a8ee620c38f5
> commit: 95b61bfed8291e54f65e1fc836c5f9b49f74068c [12548/12775] hugetlb: take hugetlb vma_lock when clearing vma_lock->vma pointer
> config: x86_64-randconfig-s022
> compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
> reproduce:
>         # apt-get install sparse
>         # sparse version: v0.6.4-39-gce1a6720-dirty
>         # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=95b61bfed8291e54f65e1fc836c5f9b49f74068c
>         git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>         git fetch --no-tags linux-next master
>         git checkout 95b61bfed8291e54f65e1fc836c5f9b49f74068c
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' 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>
> 
> sparse warnings: (new ones prefixed by >>)
> >> mm/hugetlb.c:6835:6: sparse: sparse: symbol '__hugetlb_vma_unlock_write_put' was not declared. Should it be static?
>    mm/hugetlb.c:459:12: sparse: sparse: context imbalance in 'allocate_file_region_entries' - wrong count at exit
>    mm/hugetlb.c:530:13: sparse: sparse: context imbalance in 'region_add' - wrong count at exit
>    mm/hugetlb.c:597:13: sparse: sparse: context imbalance in 'region_chg' - wrong count at exit
>    mm/hugetlb.c: note: in included file:
>    include/linux/mm.h:1282:17: sparse: sparse: context imbalance in 'demote_free_huge_page' - unexpected unlock
>    mm/hugetlb.c:4969:20: sparse: sparse: context imbalance in 'move_huge_pte' - different lock contexts for basic block
>    mm/hugetlb.c:5340:17: sparse: sparse: context imbalance in 'hugetlb_wp' - unexpected unlock
>    mm/hugetlb.c:6221:25: sparse: sparse: context imbalance in 'follow_hugetlb_page' - different lock contexts for basic block

Apologies for missing this in the previous fix!

>From cabb47237ecc48fceba767eee90f9b311876b329 Mon Sep 17 00:00:00 2001
From: Mike Kravetz <mike.kravetz@...cle.com>
Date: Fri, 7 Oct 2022 19:15:08 -0700
Subject: [PATCH] hugetlb: fix sparse warning for
 __hugetlb_vma_unlock_write_put

Declare __hugetlb_vma_unlock_write_put as static.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
---
 mm/hugetlb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ac10d7d1a3ab..7cbe4f7c9baf 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6832,7 +6832,7 @@ void hugetlb_vma_lock_release(struct kref *kref)
 	kfree(vma_lock);
 }
 
-void __hugetlb_vma_unlock_write_put(struct hugetlb_vma_lock *vma_lock)
+static void __hugetlb_vma_unlock_write_put(struct hugetlb_vma_lock *vma_lock)
 {
 	struct vm_area_struct *vma = vma_lock->vma;
 
-- 
2.37.3