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zram has always used "unsigned int" for (page) index calculations, which unnecessarily limited max zram disksize. Switch to "unsigned long" and permit much larger zram devices. Link: https://lore.kernel.org/20260806031640.536615-1-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Co-developed-by: Longlong Xia <xialonglong2025@163.com> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>