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In most cases zcomp_available_show() is the only emitting function that is called from sysfs read() handler, so it assumes that there is a whole PAGE_SIZE buffer to work with. There is an exception, however: recomp_algorithm_show(). In recomp_algorithm_show() we prepend the buffer with priority number before we pass it to zcomp_available_show(), so it cannot assume PAGE_SIZE anymore and must take recomp_algorithm_show() modifications into consideration. Therefore we need to pass buffer offset to zcomp_available_show(). Also convert it to use sysfs_emit_at(), to stay aligned with the rest of zram's sysfs read() handlers. On practice we are never even close to using the whole PAGE_SIZE buffer, so that's not a critical bug, but still. Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Link: https://lore.kernel.org/r/20250627071840.1394242-1-senozhatsky@chromium.org Signed-off-by: Jens Axboe <axboe@kernel.dk>