Re: fs/crypto/bio.c:67:17: sparse: sparse: cast to restricted blk_status_t

[Christoph Hellwig <hch@lst.de>]

It looks like some arm64 configs generate sparse warnings when using
cmpxchg on __bitwise types.  Any chance I could prod the arm64 maintainers
into looking into this?

On Mon, Feb 23, 2026 at 09:23:07AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
> commit: bc26e2efa2c5bb9289fa894834446840dea0bc31 fscrypt: keep multiple bios in flight in fscrypt_zeroout_range_inline_crypt
> date:   6 weeks ago
> config: arm64-randconfig-r134-20260223 (https://download.01.org/0day-ci/archive/20260223/202602230947.uNRsPyBn-lkp@intel.com/config)
> compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project d8f778935a5bf8a173a3c1d886fd736a4ef6cf05)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260223/202602230947.uNRsPyBn-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@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202602230947.uNRsPyBn-lkp@intel.com/
> 
> sparse warnings: (new ones prefixed by >>)
>    fs/crypto/bio.c:67:17: sparse: sparse: cast from restricted blk_status_t
> >> fs/crypto/bio.c:67:17: sparse: sparse: cast to restricted blk_status_t
> 
> vim +67 fs/crypto/bio.c
> 
>     61	
>     62	static void fscrypt_zeroout_range_end_io(struct bio *bio)
>     63	{
>     64		struct fscrypt_zero_done *done = bio->bi_private;
>     65	
>     66		if (bio->bi_status)
>   > 67			cmpxchg(&done->status, 0, bio->bi_status);
>     68		fscrypt_zeroout_range_done(done);
>     69		bio_put(bio);
>     70	}
>     71	
> 
> -- 
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki
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