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- /* SPDX-License-Identifier: GPL-2.0 */
- #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
- * MIGRATE_SYNC_NO_COPY will block when migrating pages but will not copy pages
- * with the CPU. Instead, page copy happens outside the migratepage()
- * callback and is likely using a DMA engine. See migrate_vma() and HMM
- * (mm/hmm.c) for users of this mode.
- */
- enum migrate_mode {
- MIGRATE_ASYNC,
- MIGRATE_SYNC_LIGHT,
- MIGRATE_SYNC,
- MIGRATE_SYNC_NO_COPY,
- };
- #endif /* MIGRATE_MODE_H_INCLUDED */
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