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authorTom Herbert <tom@quantonium.net>2017-12-04 21:31:44 +0300
committerDavid S. Miller <davem@davemloft.net>2017-12-11 17:58:39 +0300
commit92f36cca5773cbaa78c46ccf49503964a52da294 (patch)
tree2394487382c8aba5c082942f9774697fbb397999 /include/linux
parent2b86093135d014624f668658e1636f22a3027fc2 (diff)
downloadlinux-92f36cca5773cbaa78c46ccf49503964a52da294.tar.xz
spinlock: Add library function to allocate spinlock buckets array
Add two new library functions: alloc_bucket_spinlocks and free_bucket_spinlocks. These are used to allocate and free an array of spinlocks that are useful as locks for hash buckets. The interface specifies the maximum number of spinlocks in the array as well as a CPU multiplier to derive the number of spinlocks to allocate. The number allocated is rounded up to a power of two to make the array amenable to hash lookup. Signed-off-by: Tom Herbert <tom@quantonium.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/spinlock.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index a39186194cd6..10fd28b118ee 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -414,4 +414,10 @@ extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
#define atomic_dec_and_lock(atomic, lock) \
__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
+int alloc_bucket_spinlocks(spinlock_t **locks, unsigned int *lock_mask,
+ size_t max_size, unsigned int cpu_mult,
+ gfp_t gfp);
+
+void free_bucket_spinlocks(spinlock_t *locks);
+
#endif /* __LINUX_SPINLOCK_H */