From: "Ahmed S. Darwish" <a.darwish@linutronix.de> To: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, Will Deacon <will@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de>, "Paul E. McKenney" <paulmck@kernel.org>, "Sebastian A. Siewior" <bigeasy@linutronix.de>, Steven Rostedt <rostedt@goodmis.org>, LKML <linux-kernel@vger.kernel.org>, "Ahmed S. Darwish" <a.darwish@linutronix.de>, "David S. Miller" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>, netdev@vger.kernel.org Subject: [PATCH v1 01/25] net: core: device_rename: Use rwsem instead of a seqcount Date: Tue, 19 May 2020 23:45:23 +0200 Message-ID: <20200519214547.352050-2-a.darwish@linutronix.de> (raw) In-Reply-To: <20200519214547.352050-1-a.darwish@linutronix.de> Sequence counters write paths are critical sections that must never be preempted, and blocking, even for CONFIG_PREEMPTION=n, is not allowed. Commit 5dbe7c178d3f ("net: fix kernel deadlock with interface rename and netdev name retrieval.") handled a deadlock, observed with CONFIG_PREEMPTION=n, where the devnet_rename seqcount read side was infinitely spinning: it got scheduled after the seqcount write side blocked inside its own critical section. To fix that deadlock, among other issues, the commit added a cond_resched() inside the read side section. While this will get the non-preemptible kernel eventually unstuck, the seqcount reader is fully exhausting its slice just spinning -- until TIF_NEED_RESCHED is set. The fix is also still broken: if the seqcount reader belongs to a real-time scheduling policy, it can spin forever and the kernel will livelock. Disabling preemption over the seqcount write side critical section will not work: inside it are a number of GFP_KERNEL allocations and mutex locking through the drivers/base/ :: device_rename() call chain. From all the above, replace the seqcount with a rwsem. Fixes: 5dbe7c178d3f (net: fix kernel deadlock with interface rename and netdev name retrieval.) Fixes: 30e6c9fa93cf (net: devnet_rename_seq should be a seqcount) Fixes: c91f6df2db49 (sockopt: Change getsockopt() of SO_BINDTODEVICE to return an interface name) Cc: <stable@vger.kernel.org> Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- net/core/dev.c | 30 ++++++++++++------------------ 1 file changed, 12 insertions(+), 18 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 522288177bbd..e18a4c23df0e 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -79,6 +79,7 @@ #include <linux/sched.h> #include <linux/sched/mm.h> #include <linux/mutex.h> +#include <linux/rwsem.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/socket.h> @@ -194,7 +195,7 @@ static DEFINE_SPINLOCK(napi_hash_lock); static unsigned int napi_gen_id = NR_CPUS; static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8); -static seqcount_t devnet_rename_seq; +static DECLARE_RWSEM(devnet_rename_sem); static inline void dev_base_seq_inc(struct net *net) { @@ -930,18 +931,13 @@ EXPORT_SYMBOL(dev_get_by_napi_id); * @net: network namespace * @name: a pointer to the buffer where the name will be stored. * @ifindex: the ifindex of the interface to get the name from. - * - * The use of raw_seqcount_begin() and cond_resched() before - * retrying is required as we want to give the writers a chance - * to complete when CONFIG_PREEMPTION is not set. */ int netdev_get_name(struct net *net, char *name, int ifindex) { struct net_device *dev; - unsigned int seq; -retry: - seq = raw_seqcount_begin(&devnet_rename_seq); + down_read(&devnet_rename_sem); + rcu_read_lock(); dev = dev_get_by_index_rcu(net, ifindex); if (!dev) { @@ -951,10 +947,8 @@ int netdev_get_name(struct net *net, char *name, int ifindex) strcpy(name, dev->name); rcu_read_unlock(); - if (read_seqcount_retry(&devnet_rename_seq, seq)) { - cond_resched(); - goto retry; - } + + up_read(&devnet_rename_sem); return 0; } @@ -1228,10 +1222,10 @@ int dev_change_name(struct net_device *dev, const char *newname) likely(!(dev->priv_flags & IFF_LIVE_RENAME_OK))) return -EBUSY; - write_seqcount_begin(&devnet_rename_seq); + down_write(&devnet_rename_sem); if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { - write_seqcount_end(&devnet_rename_seq); + up_write(&devnet_rename_sem); return 0; } @@ -1239,7 +1233,7 @@ int dev_change_name(struct net_device *dev, const char *newname) err = dev_get_valid_name(net, dev, newname); if (err < 0) { - write_seqcount_end(&devnet_rename_seq); + up_write(&devnet_rename_sem); return err; } @@ -1254,11 +1248,11 @@ int dev_change_name(struct net_device *dev, const char *newname) if (ret) { memcpy(dev->name, oldname, IFNAMSIZ); dev->name_assign_type = old_assign_type; - write_seqcount_end(&devnet_rename_seq); + up_write(&devnet_rename_sem); return ret; } - write_seqcount_end(&devnet_rename_seq); + up_write(&devnet_rename_sem); netdev_adjacent_rename_links(dev, oldname); @@ -1279,7 +1273,7 @@ int dev_change_name(struct net_device *dev, const char *newname) /* err >= 0 after dev_alloc_name() or stores the first errno */ if (err >= 0) { err = ret; - write_seqcount_begin(&devnet_rename_seq); + down_write(&devnet_rename_sem); memcpy(dev->name, oldname, IFNAMSIZ); memcpy(oldname, newname, IFNAMSIZ); dev->name_assign_type = old_assign_type; -- 2.20.1
next prev parent 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 ` Ahmed S. Darwish [this message] 2020-05-19 22:01 ` [PATCH v1 01/25] net: core: device_rename: Use rwsem instead of a seqcount 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 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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