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From: David Miller <davem@davemloft.net>
To: linux@roeck-us.net
Cc: neilb@suse.com, tgraf@suug.ch, herbert@gondor.apana.org.au,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/5] Fix rhashtable bit-locking for m68k
Date: Fri, 12 Apr 2019 17:34:58 -0700 (PDT)	[thread overview]
Message-ID: <20190412.173458.2194302001630174696.davem@davemloft.net> (raw)
In-Reply-To: <db89e10c-44ba-117d-2fe3-e01eb733d29a@roeck-us.net>

From: Guenter Roeck <linux@roeck-us.net>
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 <linux@roeck-us.net>

Series applied.

      reply	other threads:[~2019-04-13  0:35 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-12  1:52 NeilBrown
2019-04-12  1:52 ` [PATCH 1/5] rhashtable: fix some __rcu annotation errors NeilBrown
2019-04-12  1:52 ` [PATCH 5/5] rhashtable: use BIT(0) for locking NeilBrown
2019-04-12  1:52 ` [PATCH 2/5] rhashtable: reorder some inline functions and macros NeilBrown
2019-05-14 19:25   ` Jakub Kicinski
2019-04-12  1:52 ` [PATCH 4/5] rhashtable: replace rht_ptr_locked() with rht_assign_locked() NeilBrown
2019-04-12  1:52 ` [PATCH 3/5] rhashtable: move dereference inside rht_ptr() NeilBrown
2019-04-12 18:08 ` [PATCH 0/5] Fix rhashtable bit-locking for m68k Guenter Roeck
2019-04-13  0:34   ` David Miller [this message]

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