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ext4: Use folio_next_pos()
This is one instruction more efficient than open-coding folio_pos() + folio_size(). It's the equivalent of (x + y) << z rather than x << z + y << z. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Link: https://patch.msgid.link/20251024170822.1427218-5-willy@infradead.org Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Zhang Yi <yi.zhang@huawei.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: linux-ext4@vger.kernel.org Signed-off-by: Christian Brauner <brauner@kernel.org>
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