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It will be used in suspend code and serves as an easy wrap around copy_from_user. Similar to simple_read_from_buffer, it takes care of transfers with proper lengths depending on available and count parameters and advances ppos appropriately. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>