linux-ext4 - Re: [linux-next:master] BUILD REGRESSION 4ca786ae6681b90b0ec3f4c55c89d12f835f8944

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Date:   Tue, 18 Oct 2022 22:04:12 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     kernel test robot <lkp@...el.com>,
        "ntfs3@...ts.linux.dev" <ntfs3@...ts.linux.dev>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "jfs-discussion@...ts.sourceforge.net" 
        <jfs-discussion@...ts.sourceforge.net>
Subject: Re: [linux-next:master] BUILD REGRESSION
 4ca786ae6681b90b0ec3f4c55c89d12f835f8944

* Andrew Morton <akpm@...ux-foundation.org> [221018 17:02]:
> On Tue, 18 Oct 2022 23:45:39 +0800 kernel test robot <lkp@...el.com> wrote:
> 
> > tree/branch: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > branch HEAD: 4ca786ae6681b90b0ec3f4c55c89d12f835f8944  Add linux-next specific files for 20221018
> > 
> > ...
> >
> > mm/mmap.c:802 __vma_adjust() error: uninitialized symbol 'next_next'.
> > 
> 
> The code's OK but I guess we should make this warning go away.

Agreed.  It took a while to understand that this was a suggested way of
fixing it and not the issue itself.  I'll send out something shortly.

> 
> --- a/mm/mmap.c~a
> +++ a/mm/mmap.c
> @@ -618,7 +618,8 @@ int __vma_adjust(struct vm_area_struct *
>  	struct vm_area_struct *expand)
>  {
>  	struct mm_struct *mm = vma->vm_mm;
> -	struct vm_area_struct *next_next, *next = find_vma(mm, vma->vm_end);
> +	struct vm_area_struct *next_next = NULL;	/* uninit var warning */
> +	struct vm_area_struct *next = find_vma(mm, vma->vm_end);
>  	struct vm_area_struct *orig_vma = vma;
>  	struct address_space *mapping = NULL;
>  	struct rb_root_cached *root = NULL;
> _
> 
>