Update SUMMARY.md

8 years ago · cd7e2cf0e9
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 * [Synchronization primitives](SyncPrim/README.md)
    * [Introduction to spinlocks](SyncPrim/sync-1.md)
    * [Queued spinlocks](SyncPrim/sync-2.md)
+    * [Semaphores](SyncPrim/sync-3.md)
 * [Memory management](mm/README.md)
    * [Memblock](mm/linux-mm-1.md)
    * [Fixmaps and ioremap](mm/linux-mm-2.md)