linux-kernel - Re: [linux-next:master 728/1207] fs/xfs/xfs_file.c:1266:31: sparse: sparse: incorrect type in return expression (different base types)

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Date:   Tue, 7 Jun 2022 16:05:46 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Shiyang Ruan <ruansy.fnst@...itsu.com>, kbuild-all@...ts.01.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        "Darrick J. Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [linux-next:master 728/1207] fs/xfs/xfs_file.c:1266:31: sparse:
 sparse: incorrect type in return expression (different base types)

On Tue, 7 Jun 2022 15:09:18 +0800 kernel test robot <lkp@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   73d0e32571a0786151eb72634f1a4c5891166176
> commit: d5f5b32dee7c09e3152cbbce45c73f0b1ea7d94c [728/1207] xfs: support CoW in fsdax mode
> config: x86_64-rhel-8.3-kselftests (https://download.01.org/0day-ci/archive/20220607/202206071511.FI7WLdZo-lkp@intel.com/config)
> compiler: gcc-11 (Debian 11.3.0-1) 11.3.0
> reproduce:
>         # apt-get install sparse
>         # sparse version: v0.6.4-18-g56afb504-dirty
>         # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=d5f5b32dee7c09e3152cbbce45c73f0b1ea7d94c
>         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 d5f5b32dee7c09e3152cbbce45c73f0b1ea7d94c
>         # 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 fs/xfs/
> 
> 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 >>)
> >> fs/xfs/xfs_file.c:1266:31: sparse: sparse: incorrect type in return expression (different base types) @@     expected int @@     got restricted vm_fault_t @@
>    fs/xfs/xfs_file.c:1266:31: sparse:     expected int
>    fs/xfs/xfs_file.c:1266:31: sparse:     got restricted vm_fault_t
> >> fs/xfs/xfs_file.c:1260:1: sparse: sparse: symbol 'xfs_dax_fault' was not declared. Should it be static?
> >> fs/xfs/xfs_file.c:1314:21: sparse: sparse: incorrect type in assignment (different base types) @@     expected restricted vm_fault_t [usertype] ret @@     got int @@
>    fs/xfs/xfs_file.c:1314:21: sparse:     expected restricted vm_fault_t [usertype] ret
>    fs/xfs/xfs_file.c:1314:21: sparse:     got int
> 
> Please review and possibly fold the followup patch.

Well yes, the followup patch
(https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/xfs-support-cow-in-fsdax-mode-fix.patch)
will most definitely be folded.

Can you suggest how this can be communicated to the robot in order to
suppress this notification?  A Fixes: won't work, as neither of these
patches have yet been promoted to a "stable" state.  Their hashes will
change.