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nilfs2: make superblock data array index computation sparse friendly
Upon running sparse, "warning: dubious: x & !y" is output at an array
index calculation within nilfs_load_super_block().
The calculation is not wrong, but to eliminate the sparse warning, replace
it with an equivalent calculation.
Also, add a comment to make it easier to understand what the unintuitive
array index calculation is doing and whether it's correct.
Link: https://lkml.kernel.org/r/20240430080019.4242-3-konishi.ryusuke@gmail.com
Fixes: e339ad3 ("nilfs2: introduce secondary super block")
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: kernel test robot <lkp@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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