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Date:   Tue, 2 Apr 2019 10:11:31 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'NeilBrown' <>, Thomas Graf <>,
        Herbert Xu <>
CC:     "" <>,
        "" <>
Subject: RE: [PATCH 3/4] rhashtable: use bit_spin_locks to protect hash

From: NeilBrown
> Sent: 02 April 2019 00:08
> This patch changes rhashtables to use a bit_spin_lock on BIT(1) of the
> bucket pointer to lock the hash chain for that bucket.
> To enhance type checking, a new struct is introduced to represent the
>   pointer plus lock-bit
> that is stored in the bucket-table.  This is "struct rhash_lock_head"
> and is empty.  A pointer to this needs to be cast to either an
> unsigned lock, or a "struct rhash_head *" to be useful.
> Variables of this type are most often called "bkt".

Did you try using a union of the pointer and an 'unsigned long' ?
Should remove a lot of the casts.


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