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Date: Tue, 4 May 2010 13:19:34 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com, eric.dumazet@...il.com Subject: [PATCH tip/core/rcu 0/48] v4 patches queued for 2.6.35 Hello! RFC preview of RCU patches queued for 2.6.35, take 4. Take 3 is at http://lkml.org/lkml/2010/4/20/321. New patches flagged with "New". 1. New: optionally leave lockdep enabled after RCU lockdep splat This patch, based on one from Lai Jiangshan, allows multiple RCU-lockdep splats per boot. This was proposed for 2.6.34, but it does not qualify as a regression, so it is now at the head of the 2.6.35 queue. 2. substitute set_need_resched for sending resched IPIs This reduces OS jitter. 3. make dead code really dead. 4. move some code from macro to function Cleanups from Lai Jiangshan. 5. ignore offline CPUs in last non dyntick idle CPU check Fix to my CONFIG_RCU_FAST_NO_HZ code to handle offline and non-existent CPUs, also from Lai Jiangshan. 6. fix bogus CONFIG_PROVE_LOCKING in comments to reality 7. fix now bogus rcu_scheduler_active comments Comment fixups. 8. shrink rcutiny by making synchronize_rcu_bh be inline Shrink TINY_RCU some more. 9. rename rcutiny rcu_ctrlblk to rcu_sched_ctrlblk First step towards TINY_PREEMPTIBLE_RCU. 10. refactor RCU's context switch handling Reduce the number of needless softirqs. 11. slim down rcutiny by removing rcu_scheduler_active and friends More shrinkage for TINY_RCU 12. enable CPU_STALL_VERBOSE by default. It will have been in one release, so time to enable it. 13. disable CPU stall warnings upon panic 14. print boot-time console messages if RCU configs out of ordinary 15. improve RCU CPU stall-warning messages 16. permit discontiguous cpu_possible_mask CPU numbering 17. v2: reduce the number of spurious RCU_SOFTIRQ invocations [Original from Lai Jiangshan] 18. improve the RCU CPU-stall-warning documentation 19. debugobjects transition check 20. introduce rcu_head_init_on_stack 21. remove all non-on-stack rcu_head initializations 22. remove rcu_head initializers 23. Add debug RCU head objects Debug-objects-based rcu_head checking from Mathieu Desnoyers 24. make SRCU usable in modules [From Lai Jiangshan] 25. New: fix debugobjects rcu head init on stack in rcutree_plugin.h Fix from Mathieu for the earlier debugobjects series 26. New: RCU_FAST_NO_HZ must check RCU dyntick state Fix for the classic Classic RCU bug introduced via the RCU_FAST_NO_HZ patch. :-/ 27. New: add fs.h to define struct file 28. New: Make accesses to ->br_port safe for sparse RCU 29. New: add an rcu_dereference_index_check() 30. New: mce: convert to rcu_dereference_index_check() 31. New: define __rcu address space modifier for sparse 32. New: rculist: avoid __rcu annotations 33. New: cgroups: __rcu annotations 34. New: credentials: rcu annotation 35. New: keys: __rcu annotations 36. New: nfs: __rcu annotations 37. New: net: __rcu annotations for drivers 38. New: perf_event: __rcu annotations 39. New: notifiers: __rcu annotations 40. New: radix-tree: __rcu annotations 41. New: idr: __rcu annotations 42. New: input: __rcu annotations 43. New: vhost: add __rcu annotations 44. New: net/netfilter: __rcu annotations 45. New: kvm: add __rcu annotations 46. New: kernel: __rcu annotations 47. New: net: __rcu annotations 48. New: kvm: more __rcu annotations Sparse-based RCU checking from Arnd Bergmann. These changes allow sparse to generate complaints if RCU-protected pointers are accessed directly rather than via the appropriate RCU primitive. This is a debugging tool rather than a code-quality enforcement mechanism, although Arnd does have some additional patches should someone wish to use this as a code-quality enforcement mechanism for their code. Thanx, Paul b/Documentation/RCU/stallwarn.txt | 94 +++-- b/Documentation/RCU/trace.txt | 35 + b/arch/powerpc/mm/pgtable.c | 1 b/arch/x86/include/asm/kvm_host.h | 2 b/arch/x86/kernel/cpu/mcheck/mce.c | 2 b/block/cfq-iosched.c | 1 b/block/genhd.c | 1 b/drivers/input/evdev.c | 2 b/drivers/net/bnx2.h | 2 b/drivers/net/bnx2x.h | 2 b/drivers/net/cnic.h | 2 b/drivers/net/macvtap.c | 2 b/drivers/staging/batman-adv/hard-interface.c | 1 b/drivers/vhost/net.c | 6 b/drivers/vhost/vhost.c | 12 b/drivers/vhost/vhost.h | 4 b/fs/file.c | 3 b/fs/fs-writeback.c | 31 + b/fs/nfs/delegation.h | 2 b/fs/partitions/check.c | 1 b/include/linux/cgroup.h | 4 b/include/linux/compiler.h | 6 b/include/linux/cred.h | 2 b/include/linux/debugobjects.h | 11 b/include/linux/fdtable.h | 1 b/include/linux/fs.h | 2 b/include/linux/genhd.h | 6 b/include/linux/idr.h | 4 b/include/linux/if_bridge.h | 1 b/include/linux/if_macvlan.h | 2 b/include/linux/igmp.h | 4 b/include/linux/init_task.h | 1 b/include/linux/input.h | 2 b/include/linux/iocontext.h | 2 b/include/linux/key.h | 3 b/include/linux/kvm_host.h | 2 b/include/linux/mm_types.h | 2 b/include/linux/netdevice.h | 12 b/include/linux/nfs_fs.h | 2 b/include/linux/notifier.h | 10 b/include/linux/perf_event.h | 6 b/include/linux/radix-tree.h | 4 b/include/linux/rculist.h | 52 +- b/include/linux/rculist_nulls.h | 16 b/include/linux/rcupdate.h | 6 b/include/linux/rcutiny.h | 12 b/include/linux/rcutree.h | 2 b/include/linux/sched.h | 2 b/include/linux/srcu.h | 4 b/include/linux/sunrpc/auth_gss.h | 4 b/include/net/dst.h | 2 b/include/net/fib_rules.h | 2 b/include/net/garp.h | 2 b/include/net/inet_sock.h | 2 b/include/net/ip6_tunnel.h | 2 b/include/net/ipip.h | 6 b/include/net/net_namespace.h | 2 b/include/net/netfilter/nf_conntrack.h | 2 b/include/net/netns/xfrm.h | 2 b/include/net/sock.h | 4 b/kernel/cgroup.c | 2 b/kernel/lockdep.c | 2 b/kernel/pid.c | 2 b/kernel/rcupdate.c | 19 - b/kernel/rcutiny.c | 9 b/kernel/rcutiny_plugin.h | 39 ++ b/kernel/rcutorture.c | 2 b/kernel/rcutree.c | 10 b/kernel/rcutree.h | 1 b/kernel/rcutree_plugin.h | 2 b/kernel/rcutree_trace.c | 4 b/kernel/sched.c | 2 b/kernel/softirq.c | 2 b/lib/Kconfig.debug | 12 b/lib/debugobjects.c | 59 +++ b/lib/radix-tree.c | 2 b/mm/backing-dev.c | 1 b/mm/slob.c | 1 b/net/802/stp.c | 4 b/net/bridge/br_fdb.c | 2 b/net/bridge/br_private.h | 8 b/net/bridge/netfilter/ebt_redirect.c | 2 b/net/bridge/netfilter/ebt_ulog.c | 4 b/net/bridge/netfilter/ebtables.c | 4 b/net/ipv4/ip_gre.c | 2 b/net/ipv4/ipip.c | 10 b/net/ipv4/netfilter/nf_nat_core.c | 2 b/net/ipv4/protocol.c | 2 b/net/ipv4/route.c | 2 b/net/ipv4/tcp.c | 4 b/net/ipv6/ip6_tunnel.c | 6 b/net/ipv6/protocol.c | 2 b/net/ipv6/sit.c | 10 b/net/mac80211/ieee80211_i.h | 15 b/net/mac80211/sta_info.h | 4 b/net/netfilter/core.c | 2 b/net/netfilter/nf_conntrack_ecache.c | 4 b/net/netfilter/nf_conntrack_expect.c | 12 b/net/netfilter/nf_conntrack_extend.c | 2 b/net/netfilter/nf_conntrack_proto.c | 4 b/net/netfilter/nf_log.c | 2 b/net/netfilter/nf_queue.c | 2 b/net/netfilter/nfnetlink_log.c | 4 b/net/netfilter/nfnetlink_queue.c | 4 b/net/netlabel/netlabel_domainhash.c | 4 b/net/netlabel/netlabel_unlabeled.c | 4 b/net/netlink/af_netlink.c | 2 b/net/phonet/af_phonet.c | 2 b/net/phonet/pn_dev.c | 2 b/net/socket.c | 2 b/security/selinux/avc.c | 1 b/security/selinux/netnode.c | 2 include/linux/fdtable.h | 6 include/linux/init_task.h | 4 include/linux/kvm_host.h | 4 include/linux/rcupdate.h | 477 +++++++++++++++++--------- include/linux/rcutiny.h | 17 include/linux/rcutree.h | 4 include/linux/sched.h | 6 include/linux/srcu.h | 29 + kernel/rcupdate.c | 155 ++++++++ kernel/rcutiny.c | 28 + kernel/rcutree.c | 127 ++++-- kernel/rcutree.h | 1 kernel/rcutree_plugin.h | 69 +++ kernel/sched.c | 2 lib/Kconfig.debug | 21 + 127 files changed, 1193 insertions(+), 485 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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