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From: "Ahmed S. Darwish" <a.darwish@linutronix.de>
To: Steven Rostedt <rostedt@goodmis.org>,
	Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	"Sebastian A. Siewior" <bigeasy@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>,
	Jonathan Corbet <corbet@lwn.net>,
	linux-doc@vger.kernel.org
Subject: Re: [PATCH v4 01/24] Documentation: locking: Describe seqlock design and usage
Date: Tue, 21 Jul 2020 09:15:11 +0200
Message-ID: <20200721071510.GA1175122@debian-buster-darwi.lab.linutronix.de> (raw)
In-Reply-To: <20200720215115.4c5276db@oasis.local.home>

On Mon, Jul 20, 2020 at 09:51:15PM -0400, Steven Rostedt wrote:
> On Mon, 20 Jul 2020 21:44:00 -0400
> Steven Rostedt <rostedt@goodmis.org> wrote:
>
> > > - * This is not as cache friendly as brlock. Also, this may not work well
> > > - * for data that contains pointers, because any writer could
> > > - * invalidate a pointer that a reader was following.
> > > + * See Documentation/locking/seqlock.rst
> >
> > I absolutely hate it when I see this.
> >
> > I much rather have the documentation next to the code. Because
> > honestly, I trust that comments next to the code will get updated if
> > the code changes much more likely than comments buried in the
> > Documentation directory.
> >
> > It's also more likely that I wont even bother looking at the doc
> > (because I wont trust it to be up to date) and just read the code and
> > try to figure it out. Or look at how others have used it.
>
> Never mind,
>
> I see that kerneldoc is added in patch 5, which helps.
>

Even looking at the current patch #1 *in isolation*, no relevant
comments were removed from seqlock.h at all. They were just moved closer
to the seqcount_t and seqlock_t structure definitions.

The original comments were horrible. They intermingled seqcount_t and
seqlock_t descriptions in a *very* ambiguous, sometimes even in the same
sentence. It was misleading, as the usage constrains for each data type
(especially on the write side) are vastly different.

Even the new KCSAN comment, which was freshly merged this release cycle,
got tainted by such already-existing incoherence. It kept talking about
the "seqlock interface" while it actually meant the seqcount_t
interface.  Then at the end, it realized the semantical ambiguity and
noted how the "seqlock interface" does *not* cover seqlock_t.

Moreover, this seqcount_t/seqlock_t documentation intermingling led to
the critical usage constraint of disabling preemption before entering a
seqcount_t write side critical section never getting explicitly
mentioned. This has (naturally) led to a considerable number of buggy
call sites, and the fixes are now merged.

I've tried to fix the problem at the roots, and basically identified
three major problems:

  1. The seqcount_t/seqlock_t intermingling is confusing everyone. That
     is, both of call-site developers *and* core kernel engineers.

  2. The big picture of seqlock.h was never expressed in a sufficient
     detail.

  3. The usage constraints for the exported seqlock.h APIs were never
     explicitly mentioned.. leading to buggy call sites.

To fix #1, I've changed the all of the existing seqlock.h comments to
explicitly mention either "seqcount_t" or "seqlock_t". Then, divided the
the top seqlock.h comment into a seqcount_t part and a seqlock_t one.
Afterwards, the whole seqlock.h header file code was grouped into
"sections", as seen in patch #4.

To fix #2, Documentation/locking/seqlock.rst was introduced and boldly
referenced at the header-file top comment.

To fix #3, kernel-doc was added for all of the seqlock.h exported APIs.

@Peter, kindly note that all of the above *is exactly why* I've resisted
hiding the new seqcount_LOCKTYPE_t APIs introduced by this patch series
inside generative macros. All the parts that will be referenced by
call-site developers are kept both explicit and kernel-doc commented.

Thanks!

--
Ahmed S. Darwish
Linutronix GmbH

  reply index

Thread overview: 258+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-19 21:45 [PATCH v1 00/25] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 01/25] net: core: device_rename: Use rwsem instead of a seqcount Ahmed S. Darwish
2020-05-19 22:01   ` Stephen Hemminger
2020-05-19 22:23     ` Thomas Gleixner
2020-05-19 23:11       ` Stephen Hemminger
2020-05-19 23:42         ` Thomas Gleixner
2020-05-20  0:06           ` Stephen Hemminger
2020-05-20  1:55             ` Thomas Gleixner
2020-05-20  2:57           ` David Miller
2020-05-20  3:18             ` Eric Dumazet
2020-05-20  4:36               ` Stephen Hemminger
2020-05-20 19:37             ` Thomas Gleixner
2020-05-20 21:36               ` Stephen Hemminger
2020-05-20  2:01   ` Eric Dumazet
2020-05-20  6:42     ` Ahmed S. Darwish
2020-05-20 12:51       ` Eric Dumazet
2020-06-03 14:33         ` Ahmed S. Darwish
2020-05-20 14:37   ` Dan Carpenter
2020-05-25 16:22     ` Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 02/25] mm/swap: Don't abuse the seqcount latching API Ahmed S. Darwish
2020-05-20 12:22   ` Konstantin Khlebnikov
2020-05-20 13:05     ` Peter Zijlstra
2020-05-22 14:57   ` Peter Zijlstra
2020-05-22 15:17     ` Sebastian A. Siewior
2020-05-22 16:23       ` Peter Zijlstra
2020-05-25 15:24     ` Ahmed S. Darwish
2020-05-25 15:45       ` Peter Zijlstra
2020-05-25 16:10     ` John Ogness
2020-09-10 15:08       ` [tip: locking/core] mm/swap: Do not abuse the seqcount_t " tip-bot2 for Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 03/25] net: phy: fixed_phy: Remove unused seqcount Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 04/25] block: nr_sects_write(): Disable preemption on seqcount write Ahmed S. Darwish
2020-05-22 16:39   ` Peter Zijlstra
2020-05-25  9:56     ` Ahmed S. Darwish
     [not found]   ` <20200522001237.A00E8206BE@mail.kernel.org>
2020-05-25 10:12     ` Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 05/25] u64_stats: Document writer non-preemptibility requirement Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 06/25] dma-buf: Remove custom seqcount lockdep class key Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 07/25] lockdep: Add preemption disabled assertion API Ahmed S. Darwish
2020-05-22 17:55   ` Peter Zijlstra
2020-05-23 14:59     ` Sebastian A. Siewior
2020-05-23 22:41       ` Peter Zijlstra
2020-05-24 10:50         ` Sebastian A. Siewior
2020-05-25 10:22         ` Peter Zijlstra
2020-05-26  0:52           ` Ahmed S. Darwish
2020-05-26  8:13             ` Peter Zijlstra
2020-05-26  9:45               ` Ahmed S. Darwish
2020-06-03 15:30               ` Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 08/25] seqlock: lockdep assert non-preemptibility on seqcount_t write Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 09/25] Documentation: locking: Describe seqlock design and usage Ahmed S. Darwish
2020-05-22 18:01   ` Peter Zijlstra
2020-05-22 22:24     ` Steven Rostedt
2020-05-25 10:50       ` Ahmed S. Darwish
2020-05-25 11:02         ` Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 10/25] seqlock: Add RST directives to kernel-doc code samples and notes Ahmed S. Darwish
2020-05-22 18:02   ` Peter Zijlstra
2020-05-22 18:03     ` Peter Zijlstra
2020-05-22 18:26       ` Thomas Gleixner
2020-05-22 18:32         ` Peter Zijlstra
2020-05-25  9:36           ` Ahmed S. Darwish
2020-05-25 13:44             ` Peter Zijlstra
2020-05-25 14:07               ` Peter Zijlstra
2020-05-19 21:45 ` [PATCH v1 11/25] seqlock: Add missing kernel-doc annotations Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 12/25] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 13/25] dma-buf: Use sequence counter with associated wound/wait mutex Ahmed S. Darwish
2020-05-20 10:48   ` Christian König
2020-05-21  0:09     ` Ahmed S. Darwish
2020-05-21 13:20       ` Christian König
2020-05-19 21:45 ` [PATCH v1 14/25] sched: tasks: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 15/25] netfilter: conntrack: " Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 16/25] netfilter: nft_set_rbtree: Use sequence counter with associated rwlock Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 17/25] xfrm: policy: Use sequence counters with associated lock Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 18/25] timekeeping: Use sequence counter with associated raw spinlock Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 19/25] vfs: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 20/25] raid5: " Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 21/25] iocost: " Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 22/25] NFSv4: " Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 23/25] userfaultfd: " Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 24/25] kvm/eventfd: " Ahmed S. Darwish
2020-05-19 21:45 ` [PATCH v1 25/25] hrtimer: Use sequence counter with associated raw spinlock Ahmed S. Darwish
2020-06-08  0:57 ` [PATCH v2 00/18] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 01/18] Documentation: locking: Describe seqlock design and usage Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 02/18] seqlock: Properly format kernel-doc code samples Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 03/18] seqlock: Add missing kernel-doc annotations Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 04/18] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 05/18] dma-buf: Remove custom seqcount lockdep class key Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 06/18] dma-buf: Use sequence counter with associated wound/wait mutex Ahmed S. Darwish
2020-06-08 14:32     ` Daniel Vetter
2020-06-08  0:57   ` [PATCH v2 07/18] sched: tasks: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 08/18] netfilter: conntrack: " Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 09/18] netfilter: nft_set_rbtree: Use sequence counter with associated rwlock Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 10/18] xfrm: policy: Use sequence counters with associated lock Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 11/18] timekeeping: Use sequence counter with associated raw spinlock Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 12/18] vfs: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 13/18] raid5: " Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 14/18] iocost: " Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 15/18] NFSv4: " Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 16/18] userfaultfd: " Ahmed S. Darwish
2020-06-08  0:57   ` [PATCH v2 17/18] kvm/eventfd: " Ahmed S. Darwish
2020-06-08 12:57     ` Paolo Bonzini
2020-06-08  0:57   ` [PATCH v2 18/18] hrtimer: Use sequence counter with associated raw spinlock Ahmed S. Darwish
2020-06-30  5:44 ` [PATCH v3 00/20] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 01/20] Documentation: locking: Describe seqlock design and usage Ahmed S. Darwish
2020-07-06 21:04     ` Peter Zijlstra
2020-07-06 21:12       ` Jonathan Corbet
2020-07-06 21:16       ` Peter Zijlstra
2020-07-07 10:12       ` Ahmed S. Darwish
2020-07-07 12:47         ` Peter Zijlstra
2020-06-30  5:44   ` [PATCH v3 02/20] seqlock: Properly format kernel-doc code samples Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 03/20] seqlock: Add missing kernel-doc annotations Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 04/20] lockdep: Add preemption enabled/disabled assertion APIs Ahmed S. Darwish
2020-07-06 20:50     ` Peter Zijlstra
2020-07-07  7:34       ` Sebastian A. Siewior
2020-06-30  5:44   ` [PATCH v3 05/20] seqlock: lockdep assert non-preemptibility on seqcount_t write Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 06/20] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-07-06 21:21     ` Peter Zijlstra
2020-07-07  8:40       ` Ahmed S. Darwish
2020-07-07 13:04         ` Peter Zijlstra
2020-07-07 14:37           ` Peter Zijlstra
2020-07-08  9:12             ` Peter Zijlstra
2020-07-08 10:43               ` Ahmed S. Darwish
2020-07-08 10:33             ` Ahmed S. Darwish
2020-07-08 12:29               ` Peter Zijlstra
2020-07-08 14:13                 ` Peter Zijlstra
2020-07-08 14:25                   ` Peter Zijlstra
2020-07-08 15:09                 ` Ahmed S. Darwish
2020-07-08 15:35                   ` Peter Zijlstra
2020-07-08 15:58                     ` Ahmed S. Darwish
2020-07-08 16:16                       ` Peter Zijlstra
2020-07-08 16:18                       ` Peter Zijlstra
2020-07-08 16:01                     ` Peter Zijlstra
2020-06-30  5:44   ` [PATCH v3 07/20] dma-buf: Remove custom seqcount lockdep class key Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 08/20] dma-buf: Use sequence counter with associated wound/wait mutex Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 09/20] sched: tasks: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 10/20] netfilter: conntrack: " Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 11/20] netfilter: nft_set_rbtree: Use sequence counter with associated rwlock Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 12/20] xfrm: policy: Use sequence counters with associated lock Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 13/20] timekeeping: Use sequence counter with associated raw spinlock Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 14/20] vfs: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 15/20] raid5: " Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 16/20] iocost: " Ahmed S. Darwish
2020-06-30  7:11     ` Daniel Wagner
2020-06-30  5:44   ` [PATCH v3 17/20] NFSv4: " Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 18/20] userfaultfd: " Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 19/20] kvm/eventfd: " Ahmed S. Darwish
2020-06-30  5:44   ` [PATCH v3 20/20] hrtimer: Use sequence counter with associated raw spinlock Ahmed S. Darwish
2020-07-20 15:55 ` [PATCH v4 00/24] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 01/24] Documentation: locking: Describe seqlock design and usage Ahmed S. Darwish
2020-07-21  1:35     ` Steven Rostedt
2020-07-21  1:37       ` Steven Rostedt
2020-07-21  5:34       ` Ahmed S. Darwish
2020-07-21  1:44     ` Steven Rostedt
2020-07-21  1:51       ` Steven Rostedt
2020-07-21  7:15         ` Ahmed S. Darwish [this message]
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 02/24] seqlock: Properly format kernel-doc code samples Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 03/24] seqlock: seqcount_t latch: End read sections with read_seqcount_retry() Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 04/24] seqlock: Reorder seqcount_t and seqlock_t API definitions Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 05/24] seqlock: Add kernel-doc for seqcount_t and seqlock_t APIs Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 06/24] seqlock: Implement raw_seqcount_begin() in terms of raw_read_seqcount() Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 07/24] lockdep: Add preemption enabled/disabled assertion APIs Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 08/24] seqlock: lockdep assert non-preemptibility on seqcount_t write Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-08-08 23:21     ` [PATCH v4 08/24] " Guenter Roeck
2020-08-08 23:23       ` Guenter Roeck
2020-08-09 18:42       ` Ahmed S. Darwish
2020-08-10  8:59         ` Greg KH
2020-08-10  9:48           ` peterz
2020-08-10 10:03             ` Greg KH
2020-08-10  9:54           ` [PATCH] Revert "seqlock: lockdep assert non-preemptibility on seqcount_t write" Ahmed S. Darwish
2020-08-10 10:05             ` Greg KH
2020-08-10 10:35               ` Ahmed S. Darwish
2020-08-10 14:10               ` Guenter Roeck
2020-08-18 22:51                 ` Valdis Klētnieks
2020-08-19  0:56                   ` Guenter Roeck
2020-08-19  7:00                     ` Sebastian Andrzej Siewior
2020-08-19  7:34                       ` Valdis Klētnieks
2020-08-19 16:15                         ` Guenter Roeck
2020-08-10 19:55           ` [PATCH v4 08/24] seqlock: lockdep assert non-preemptibility on seqcount_t write Thomas Gleixner
2020-08-11 10:06             ` Greg KH
2020-07-20 15:55   ` [PATCH v4 09/24] seqlock: Extend seqcount API with associated locks Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 10/24] seqlock: Align multi-line macros newline escapes at 72 columns Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 11/24] dma-buf: Remove custom seqcount lockdep class key Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 12/24] dma-buf: Use sequence counter with associated wound/wait mutex Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 13/24] sched: tasks: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 14/24] netfilter: conntrack: " Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 15/24] netfilter: nft_set_rbtree: Use sequence counter with associated rwlock Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 16/24] xfrm: policy: Use sequence counters with associated lock Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 17/24] timekeeping: Use sequence counter with associated raw spinlock Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 18/24] vfs: Use sequence counter with associated spinlock Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 19/24] raid5: " Ahmed S. Darwish
2020-07-22  6:40     ` Song Liu
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 20/24] iocost: " Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 21/24] NFSv4: " Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 22/24] userfaultfd: " Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 23/24] kvm/eventfd: " Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 15:55   ` [PATCH v4 24/24] hrtimer: Use sequence counter with associated raw spinlock Ahmed S. Darwish
2020-07-29 14:33     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-07-20 16:49   ` [PATCH v4 00/24] seqlock: Extend seqcount API with associated locks Eric Biggers
2020-07-20 17:33     ` Ahmed S. Darwish
2020-08-27 11:40 ` [PATCH v1 0/8] seqlock: Introduce seqcount_latch_t Ahmed S. Darwish
2020-08-27 11:40   ` [PATCH v1 1/8] time/sched_clock: Use raw_read_seqcount_latch() during suspend Ahmed S. Darwish
2020-08-27 11:40   ` [PATCH v1 2/8] mm/swap: Do not abuse the seqcount_t latching API Ahmed S. Darwish
2020-08-27 11:40   ` [PATCH v1 3/8] seqlock: Introduce seqcount_latch_t Ahmed S. Darwish
2020-09-10 15:08     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-08-27 11:40   ` [PATCH v1 4/8] time/sched_clock: Use seqcount_latch_t Ahmed S. Darwish
2020-09-10 15:08     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-08-27 11:40   ` [PATCH v1 5/8] timekeeping: " Ahmed S. Darwish
2020-09-10 15:08     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-08-27 11:40   ` [PATCH v1 6/8] x86/tsc: " Ahmed S. Darwish
2020-09-04  7:41     ` peterz
2020-09-04  8:03       ` peterz
2020-09-07 16:29         ` Ahmed S. Darwish
2020-09-07 17:30           ` peterz
2020-09-08  6:23             ` Ahmed S. Darwish
2020-09-10 15:08     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-08-27 11:40   ` [PATCH v1 7/8] rbtree_latch: " Ahmed S. Darwish
2020-09-10 15:08     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-08-27 11:40   ` [PATCH v1 8/8] seqlock: seqcount latch APIs: Only allow seqcount_latch_t Ahmed S. Darwish
2020-09-10 15:08     ` [tip: locking/core] " tip-bot2 for Ahmed S. Darwish
2020-08-28  1:07 ` [PATCH v1 0/5] seqlock: Introduce PREEMPT_RT support Ahmed S. Darwish
2020-08-28  1:07   ` [PATCH v1 1/5] seqlock: seqcount_LOCKTYPE_t: Standardize naming convention Ahmed S. Darwish
2020-08-28  8:18     ` peterz
2020-08-28  8:24       ` Ahmed S. Darwish
2020-08-28  1:07   ` [PATCH v1 2/5] seqlock: Use unique prefix for seqcount_t property accessors Ahmed S. Darwish
2020-08-28  8:27     ` peterz
2020-08-28  8:59       ` Ahmed S. Darwish
2020-08-28  1:07   ` [PATCH v1 3/5] seqlock: seqcount_t: Implement all read APIs as statement expressions Ahmed S. Darwish
2020-08-28  8:30     ` peterz
2020-08-28  8:37       ` Ahmed S. Darwish
2020-08-28  1:07   ` [PATCH v1 4/5] seqlock: seqcount_LOCKTYPE_t: Introduce PREEMPT_RT support Ahmed S. Darwish
2020-08-28  8:57     ` peterz
2020-08-28  8:59     ` peterz
2020-08-28  9:31       ` Ahmed S. Darwish
2020-08-28 14:36         ` Ahmed S. Darwish
2020-08-28  1:07   ` [PATCH v1 5/5] seqlock: PREEMPT_RT: Do not starve seqlock_t writers Ahmed S. Darwish
2020-09-04  6:52   ` [PATCH v1 0/5] seqlock: Introduce PREEMPT_RT support peterz
2020-09-04  7:30     ` Ahmed S. Darwish
2020-09-10 15:08 ` [tip: locking/core] seqlock: seqcount_LOCKNAME_t: " tip-bot2 for Ahmed S. Darwish

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