linux-kernel - Re: [PATCH] mm: do not assume file == vma->vm_file in compat_vma_mmap

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Message-ID: <0539e252-0563-42c4-8044-085504a89c69@lucifer.local>
Date: Wed, 3 Sep 2025 18:35:01 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: kernel test robot <lkp@...el.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, oe-kbuild-all@...ts.linux.dev,
        Linux Memory Management List <linux-mm@...ck.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
        David Hildenbrand <david@...hat.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
        Jann Horn <jannh@...gle.com>, Pedro Falcato <pfalcato@...e.de>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: do not assume file == vma->vm_file in
 compat_vma_mmap_prepare()

On Wed, Sep 03, 2025 at 01:25:47PM +0800, kernel test robot wrote:
> Hi Lorenzo,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on akpm-mm/mm-everything]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Lorenzo-Stoakes/mm-do-not-assume-file-vma-vm_file-in-compat_vma_mmap_prepare/20250902-184946
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link:    https://lore.kernel.org/r/20250902104533.222730-1-lorenzo.stoakes%40oracle.com
> patch subject: [PATCH] mm: do not assume file == vma->vm_file in compat_vma_mmap_prepare()
> config: i386-buildonly-randconfig-001-20250903 (https://download.01.org/0day-ci/archive/20250903/202509031346.N6FpuQIA-lkp@intel.com/config)
> compiler: gcc-13 (Debian 13.3.0-16) 13.3.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250903/202509031346.N6FpuQIA-lkp@intel.com/reproduce)
>
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202509031346.N6FpuQIA-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
> >> Warning: mm/util.c:1145 function parameter 'f_op' not described in '__compat_vma_mmap_prepare'

This is because I used '-' and not ':' :)

> >> Warning: mm/util.c:1145 function parameter 'file' not described in '__compat_vma_mmap_prepare'

And this I just missed adding.

Both are fixed in respin I am about to send.

>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki

Cheers, Lorenzo