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From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Peter Zijlstra <peterz@infradead.org>,
	linux-kernel@vger.kernel.org, mingo@kernel.org,
	jiangshanlai@gmail.com, dipankar@in.ibm.com,
	akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
	josh@joshtriplett.org, tglx@linutronix.de, rostedt@goodmis.org,
	dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com,
	oleg@redhat.com, bobby.prani@gmail.com,
	Christoph Lameter <cl@linux.com>,
	Pekka Enberg <penberg@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	linux-mm@kvack.org
Subject: Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU
Date: Thu, 13 Apr 2017 09:00:27 -0700	[thread overview]
Message-ID: <20170413160027.GX3956@linux.vnet.ibm.com> (raw)
In-Reply-To: <50d59b9c-fa8e-1992-2613-e84774ec5428@suse.cz>

On Thu, Apr 13, 2017 at 01:06:56PM +0200, Vlastimil Babka wrote:
> On 04/13/2017 11:12 AM, Peter Zijlstra wrote:
> > On Wed, Apr 12, 2017 at 09:55:37AM -0700, Paul E. McKenney wrote:
> >> A group of Linux kernel hackers reported chasing a bug that resulted
> >> from their assumption that SLAB_DESTROY_BY_RCU provided an existence
> >> guarantee, that is, that no block from such a slab would be reallocated
> >> during an RCU read-side critical section.  Of course, that is not the
> >> case.  Instead, SLAB_DESTROY_BY_RCU only prevents freeing of an entire
> >> slab of blocks.
> > 
> > And that while we wrote a huge honking comment right along with it...
> > 
> >> [ paulmck: Add "tombstone" comments as requested by Eric Dumazet. ]
> > 
> > I cannot find any occurrence of "tomb" or "TOMB" in the actual patch,
> > confused?
> 
> It's the comments such as:
> 
> + * Note that SLAB_TYPESAFE_BY_RCU was originally named SLAB_DESTROY_BY_RCU.
> 
> so that people who remember the old name can git grep its fate.

Exactly!

But I must confess that "tombstone" was an excessively obscure word
choice, even for native English speakers.  I have reworded as follows:

[ paulmck: Add comments mentioning the old name, as requested by Eric
  Dumazet, in order to help people familiar with the old name find
  the new one. ]

Does that help?

							Thanx, Paul

  reply	other threads:[~2017-04-13 16:00 UTC|newest]

Thread overview: 106+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-12 16:54 [PATCH tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU Paul E. McKenney
2017-04-13  9:12   ` Peter Zijlstra
2017-04-13 11:06     ` Vlastimil Babka
2017-04-13 16:00       ` Paul E. McKenney [this message]
2017-04-13 16:17       ` Peter Zijlstra
2017-04-13 17:24         ` Paul E. McKenney
2017-04-13 21:30         ` Eric Dumazet
2017-04-14  8:45           ` Peter Zijlstra
2017-04-14 13:39             ` Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 02/13] lockdep: Use "WARNING" tag on lockdep splats Paul E. McKenney
2017-04-13  9:14   ` Peter Zijlstra
2017-04-13 16:01     ` Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 03/13] types: Update obsolete callback_head comment Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text more explicit about skew_tick Paul E. McKenney
2017-04-13  9:15   ` Peter Zijlstra
2017-04-13 16:03     ` Paul E. McKenney
2017-04-13 16:19       ` Peter Zijlstra
2017-04-13 16:55         ` Paul E. McKenney
2017-04-13 17:04           ` Peter Zijlstra
2017-04-13 17:31             ` Paul E. McKenney
2017-04-13 17:46               ` Peter Zijlstra
2017-04-13 18:19                 ` Paul E. McKenney
2017-04-13 18:23                   ` Peter Zijlstra
2017-04-13 18:42                     ` Paul E. McKenney
2017-04-19 13:22                       ` Peter Zijlstra
2017-04-19 13:48                         ` Peter Zijlstra
2017-04-19 15:08                           ` Paul E. McKenney
2017-04-19 15:40                             ` Peter Zijlstra
2017-04-19 16:13                               ` Paul E. McKenney
2017-04-19 14:50                         ` Paul E. McKenney
2017-04-13 18:29               ` Peter Zijlstra
2017-04-13 19:42                 ` Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 05/13] rcu: Remove obsolete comment from rcu_future_gp_cleanup() header Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 06/13] hlist_add_tail_rcu disable sparse warning Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 07/13] rcu: Add smp_mb__after_atomic() to sync_exp_work_done() Paul E. McKenney
2017-04-13  9:18   ` Peter Zijlstra
2017-04-13  9:33     ` Peter Zijlstra
2017-04-13 16:10     ` Paul E. McKenney
2017-04-13 16:24       ` Peter Zijlstra
2017-04-13 16:57         ` Paul E. McKenney
2017-04-13 17:10           ` Peter Zijlstra
2017-04-13 17:39             ` Paul E. McKenney
2017-04-13 17:51               ` Peter Zijlstra
2017-04-13 17:59                 ` Peter Zijlstra
2017-04-19 23:24                   ` Paul E. McKenney
2017-04-19 23:23                 ` Paul E. McKenney
2017-04-20 11:17                   ` Peter Zijlstra
2017-04-20 15:03                     ` Paul E. McKenney
2017-04-20 15:08                       ` Peter Zijlstra
2017-06-09 22:56                         ` Paul E. McKenney
2017-06-12 14:51                           ` Dmitry Vyukov
2017-06-12 21:54                             ` Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 08/13] rcu: Improve comments for hotplug/suspend/hibernate functions Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 09/13] mm: Use static initialization for "srcu" Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 10/13] torture: Use correct path for Kconfig fragment for duplicates Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 11/13] rcu: Use bool value directly Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 12/13] rcu: Use true/false in assignment to bool Paul E. McKenney
2017-04-12 16:55 ` [PATCH tip/core/rcu 13/13] rcu: Fix typo in PER_RCU_NODE_PERIOD header comment Paul E. McKenney
2017-04-17 23:27 ` [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 01/11] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU Paul E. McKenney
2017-04-18  0:14     ` David Rientjes
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 02/11] lockdep: Use "WARNING" tag on lockdep splats Paul E. McKenney
2017-04-19 15:00     ` Josh Triplett
2017-04-19 16:26       ` Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 03/11] types: Update obsolete callback_head comment Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 04/11] rcu: Make RCU_FANOUT_LEAF help text more explicit about skew_tick Paul E. McKenney
2017-04-18  0:18     ` Josh Triplett
2017-04-18 18:42       ` Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 05/11] rcu: Remove obsolete comment from rcu_future_gp_cleanup() header Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 06/11] hlist_add_tail_rcu disable sparse warning Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 07/11] rcu: Improve comments for hotplug/suspend/hibernate functions Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 08/11] torture: Use correct path for Kconfig fragment for duplicates Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 09/11] rcu: Use bool value directly Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 10/11] rcu: Use true/false in assignment to bool Paul E. McKenney
2017-04-17 23:28   ` [PATCH v2 tip/core/rcu 11/11] rcu: Fix typo in PER_RCU_NODE_PERIOD header comment Paul E. McKenney
2017-04-19 11:28   ` [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Peter Zijlstra
2017-04-19 11:35     ` Peter Zijlstra
2017-04-19 11:48     ` Christian Borntraeger
2017-04-19 12:08       ` Peter Zijlstra
2017-04-19 12:51         ` Marc Zyngier
2017-04-19 14:47         ` Paul E. McKenney
2017-04-19 14:52           ` Peter Zijlstra
2017-04-19 15:13             ` Paul E. McKenney
2017-04-19 14:58           ` Josh Triplett
2017-04-19 15:03             ` Peter Zijlstra
2017-04-19 15:17               ` Paul E. McKenney
2017-04-19 13:22       ` Paul E. McKenney
2017-04-19 13:25         ` Christian Borntraeger
2017-04-19 13:02     ` Paul E. McKenney
2017-04-19 13:15       ` Peter Zijlstra
2017-04-19 15:37         ` Paul E. McKenney
2017-04-19 15:43           ` Peter Zijlstra
2017-04-19 16:12             ` Paul E. McKenney
2017-04-19 16:45   ` Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 01/11] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 02/11] lockdep: Use "WARNING" tag on lockdep splats Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 03/11] types: Update obsolete callback_head comment Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 04/11] rcu: Make RCU_FANOUT_LEAF help text more explicit about skew_tick Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 05/11] rcu: Remove obsolete comment from rcu_future_gp_cleanup() header Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 06/11] hlist_add_tail_rcu disable sparse warning Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 07/11] rcu: Improve comments for hotplug/suspend/hibernate functions Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 08/11] torture: Use correct path for Kconfig fragment for duplicates Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 09/11] rcu: Use bool value directly Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 10/11] rcu: Use true/false in assignment to bool Paul E. McKenney
2017-04-19 16:46     ` [PATCH v3 tip/core/rcu 11/11] rcu: Fix typo in PER_RCU_NODE_PERIOD header comment Paul E. McKenney

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