linux-kernel - Re: linux-next: build warning after merge of the akpm-current tree

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Message-ID: <4e163fd8-4d76-4bdf-daea-4d0ae7eb78f7@oracle.com>
Date:   Thu, 12 Mar 2020 09:48:00 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build warning after merge of the akpm-current tree

On 3/12/20 12:31 AM, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the akpm-current tree, today's linux-next build (powerpc
> ppc64_defconfig) produced this warning:
> 
> fs/hugetlbfs/inode.c: In function 'remove_inode_hugepages':
> fs/hugetlbfs/inode.c:460:44: warning: 'hash' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   460 |     mutex_unlock(&hugetlb_fault_mutex_table[hash]);
>       |                                            ^
> fs/hugetlbfs/inode.c:463:5: warning: 'index' may be used uninitialized in this function [-Wmaybe-uninitialized]
>   463 |     hugetlb_vmdelete_list(&mapping->i_mmap,
>       |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   464 |      index * pages_per_huge_page(h),
>       |      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   465 |      (index + 1) * pages_per_huge_page(h));
>       |      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Introduced by commit
> 
>   6fdc8f8d1781 ("hugetlbfs: use i_mmap_rwsem to address page fault/truncate race")
> 

This is a false positive.  However, there are more serious issues with this
patch series as reported here:
https://lore.kernel.org/linux-mm/1584028670.7365.182.camel@lca.pw/

I'm working on the issue, but these may need to be reverted if I can not come
up with a solution quickly.  So, I am ignoring the false positive warning
until the more serious issue is resolved.
-- 
Mike Kravetz