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

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Date:   Tue, 18 Oct 2022 14:02:36 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kernel test robot <lkp@...el.com>
Cc:     ntfs3@...ts.linux.dev, linux-mm@...ck.org,
        linux-ext4@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        jfs-discussion@...ts.sourceforge.net,
        Liam Howlett <liam.howlett@...cle.com>
Subject: Re: [linux-next:master] BUILD REGRESSION
 4ca786ae6681b90b0ec3f4c55c89d12f835f8944

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.

--- 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;
_