kernel: add bl_list
Introduce a type of hlist that can support the use of the lowest bit in the hlist_head. This will be subsequently used to implement per-bucket bit spinlock for inode and dentry hashes, and may be useful in other cases such as network hashes. Reviewed-by:Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by:
Nick Piggin <npiggin@kernel.dk>
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