The seqcount latch lock type
The seqcount latch lock type
[Kernel] Posted Sep 17, 2020 14:49 UTC (Thu) by corbet
The kernel contains a wide variety of locking primitives; it can be hard to stay on top of all of them. So even veteran kernel developers might be forgiven for being unaware of the "seqcount latch" lock type or its use. While this lock type has existed in the kernel for several years, it is only being formalized with a proper type declaration in 5.10. So this seems like a good time to look at what these locks are and how they work.