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pp_in_progress makes sure that only one post-processing (writeback or recomrpession) is active at any given time. Functionality wise it, basically, shadows zram init_lock, when init_lock is acquired in writer mode. Switch recompress_store() and writeback_store() to take zram init_lock in writer mode, like all store() sysfs handlers should do, so that we can drop pp_in_progress. Recompression and writeback can be somewhat slow, so holding init_lock in writer mode can block zram attrs reads, but in reality the only zram attrs reads that take place are mm_stat reads, and usually it's the same process that reads mm_stat and does recompression or writeback. Link: https://lkml.kernel.org/r/20251216071342.687993-1-senozhatsky@chromium.org Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Brian Geffon <bgeffon@google.com> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>