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kernel/linux-imx6_3.14.28/include/linux/migrate_mode.h 436 Bytes
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  #ifndef MIGRATE_MODE_H_INCLUDED
  #define MIGRATE_MODE_H_INCLUDED
  /*
   * MIGRATE_ASYNC means never block
   * MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking
   *	on most operations but not ->writepage as the potential stall time
   *	is too significant
   * MIGRATE_SYNC will block when migrating pages
   */
  enum migrate_mode {
  	MIGRATE_ASYNC,
  	MIGRATE_SYNC_LIGHT,
  	MIGRATE_SYNC,
  };
  
  #endif		/* MIGRATE_MODE_H_INCLUDED */