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Date:   Fri, 12 Apr 2019 17:34:58 -0700 (PDT)
From:   David Miller <>
Subject: Re: [PATCH 0/5] Fix rhashtable bit-locking for m68k

From: Guenter Roeck <>
Date: Fri, 12 Apr 2019 11:08:41 -0700

> On 4/11/19 6:52 PM, NeilBrown wrote:
>> As reported by Guenter Roeck, the new rhashtable bit-locking
>> doesn't work on m68k as it only requires 2-byte alignment, so BIT(1)
>> is addresses is not unused.
>> We current use BIT(0) to identify a NULLS marker, but that is only
>> needed in ->next pointers.  The bucket head does not need a NULLS
>> marker, so the lsb there can be used for locking.
>> the first 4 patches make some small improvements and re-arrange some
>> code.  The final patch converts to using only BIT(0) for these two
>> different special purposes.
>> I had previously suggested dropping the series until I fix it.  Given
>> that this was fairly easy, I retract that I think it best simply to
>> add these patches to fix the code.
> For the series:
> Tested-by: Guenter Roeck <>

Series applied.

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