[강추] Unreliable Guide To Locking

Unreliable Guide To Locking
Linux SMP관련 Locking 좋은 설명
http://people.netfilter.org/~rusty/unreliable-guides/kernel-locking/kernel-locking.docbook/lklockingguide.html

percpu data
아마도 옛날 방식의 percpu를 위한 cacheline align 트릭인거 같다. ㅎ

//include/asm-arm/cache.h
#define L1_CACHE_SHIFT  5
#define L1_CACHE_BYTES  (1 << L1_CACHE_SHIFT)

#ifndef SMP_CACHE_BYTES
#define SMP_CACHE_BYTES L1_CACHE_BYTES
#endif

// include/linux/cache.h
#ifndef ____cacheline_aligned
#define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES)))
#endif