diff options
Diffstat (limited to 'include/linux/blockgroup_lock.h')
| -rw-r--r-- | include/linux/blockgroup_lock.h | 28 |
1 files changed, 3 insertions, 25 deletions
diff --git a/include/linux/blockgroup_lock.h b/include/linux/blockgroup_lock.h index e44b88ba552b..225bdb7daec7 100644 --- a/include/linux/blockgroup_lock.h +++ b/include/linux/blockgroup_lock.h @@ -10,28 +10,10 @@ #include <linux/cache.h> #ifdef CONFIG_SMP - -/* - * We want a power-of-two. Is there a better way than this? - */ - -#if NR_CPUS >= 32 -#define NR_BG_LOCKS 128 -#elif NR_CPUS >= 16 -#define NR_BG_LOCKS 64 -#elif NR_CPUS >= 8 -#define NR_BG_LOCKS 32 -#elif NR_CPUS >= 4 -#define NR_BG_LOCKS 16 -#elif NR_CPUS >= 2 -#define NR_BG_LOCKS 8 +#define NR_BG_LOCKS (4 << ilog2(NR_CPUS < 32 ? NR_CPUS : 32)) #else -#define NR_BG_LOCKS 4 -#endif - -#else /* CONFIG_SMP */ #define NR_BG_LOCKS 1 -#endif /* CONFIG_SMP */ +#endif struct bgl_lock { spinlock_t lock; @@ -49,14 +31,10 @@ static inline void bgl_lock_init(struct blockgroup_lock *bgl) spin_lock_init(&bgl->locks[i].lock); } -/* - * The accessor is a macro so we can embed a blockgroup_lock into different - * superblock types - */ static inline spinlock_t * bgl_lock_ptr(struct blockgroup_lock *bgl, unsigned int block_group) { - return &bgl->locks[(block_group) & (NR_BG_LOCKS-1)].lock; + return &bgl->locks[block_group & (NR_BG_LOCKS-1)].lock; } #endif |