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Ingo Molnar c5905afb0e static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]() 
So here's a boot tested patch on top of Jason's series that does
all the cleanups I talked about and turns jump labels into a
more intuitive to use facility. It should also address the
various misconceptions and confusions that surround jump labels.

Typical usage scenarios:

        #include <linux/static_key.h>

        struct static_key key = STATIC_KEY_INIT_TRUE;

        if (static_key_false(&key))
                do unlikely code
        else
                do likely code

Or:

        if (static_key_true(&key))
                do likely code
        else
                do unlikely code

The static key is modified via:

        static_key_slow_inc(&key);
        ...
        static_key_slow_dec(&key);

The 'slow' prefix makes it abundantly clear that this is an
expensive operation.

I've updated all in-kernel code to use this everywhere. Note
that I (intentionally) have not pushed through the rename
blindly through to the lowest levels: the actual jump-label
patching arch facility should be named like that, so we want to
decouple jump labels from the static-key facility a bit.

On non-jump-label enabled architectures static keys default to
likely()/unlikely() branches.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Jason Baron <jbaron@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: a.p.zijlstra@chello.nl
Cc: mathieu.desnoyers@efficios.com
Cc: davem@davemloft.net
Cc: ddaney.cavm@gmail.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20120222085809.GA26397@elte.hu
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2012-02-24 10:05:59 +01:00
..
ipset netfilter: ipset: dumping error triggered removing references twice 2012-01-17 10:52:55 +01:00
ipvs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-01-08 13:21:22 -08:00
core.c static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]() 2012-02-24 10:05:59 +01:00
Kconfig netfilter: Kconfig: fix unmet xt_nfacct dependencies 2011-12-29 14:39:19 -05:00
Makefile netfilter: xtables: move ipt_ecn to xt_ecn 2011-12-27 20:31:31 +01:00
nf_conntrack_acct.c Merge branch 'nf-next' of git://1984.lsi.us.es/net-next 2011-12-25 02:21:45 -05:00
nf_conntrack_amanda.c
nf_conntrack_broadcast.c
nf_conntrack_core.c net: reintroduce missing rcu_assign_pointer() calls 2012-01-12 12:26:56 -08:00
nf_conntrack_ecache.c net: reintroduce missing rcu_assign_pointer() calls 2012-01-12 12:26:56 -08:00
nf_conntrack_expect.c netfilter: provide config option to disable ancient procfs parts 2011-12-27 20:45:28 +01:00
nf_conntrack_extend.c net: reintroduce missing rcu_assign_pointer() calls 2012-01-12 12:26:56 -08:00
nf_conntrack_ftp.c module_param: make bool parameters really bool (net & drivers/net) 2011-12-19 22:27:29 -05:00
nf_conntrack_h323_asn1.c
nf_conntrack_h323_main.c module_param: make bool parameters really bool (net & drivers/net) 2011-12-19 22:27:29 -05:00
nf_conntrack_h323_types.c
nf_conntrack_helper.c netfilter: revert user-space expectation helper support 2012-01-16 14:01:23 +01:00
nf_conntrack_irc.c netfilter: add more values to enum ip_conntrack_info 2011-06-06 01:35:10 +02:00
nf_conntrack_l3proto_generic.c
nf_conntrack_netbios_ns.c
nf_conntrack_netlink.c netfilter: revert user-space expectation helper support 2012-01-16 14:01:23 +01:00
nf_conntrack_pptp.c netfilter: nf_ct_pptp: fix DNATed PPTP connection address translation 2011-08-30 15:23:03 +02:00
nf_conntrack_proto.c
nf_conntrack_proto_dccp.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
nf_conntrack_proto_generic.c
nf_conntrack_proto_gre.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
nf_conntrack_proto_sctp.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
nf_conntrack_proto_tcp.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
nf_conntrack_proto_udp.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
nf_conntrack_proto_udplite.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
nf_conntrack_sane.c netfilter: add more values to enum ip_conntrack_info 2011-06-06 01:35:10 +02:00
nf_conntrack_sip.c netfilter: add more values to enum ip_conntrack_info 2011-06-06 01:35:10 +02:00
nf_conntrack_snmp.c
nf_conntrack_standalone.c netfilter: provide config option to disable ancient procfs parts 2011-12-27 20:45:28 +01:00
nf_conntrack_tftp.c
nf_conntrack_timestamp.c module_param: make bool parameters really bool (net & drivers/net) 2011-12-19 22:27:29 -05:00
nf_internals.h
nf_log.c net: reintroduce missing rcu_assign_pointer() calls 2012-01-12 12:26:56 -08:00
nf_queue.c net: reintroduce missing rcu_assign_pointer() calls 2012-01-12 12:26:56 -08:00
nf_sockopt.c
nf_tproxy_core.c
nfnetlink.c Merge branch 'for-linus' of git://selinuxproject.org/~jmorris/linux-security 2012-01-14 18:36:33 -08:00
nfnetlink_acct.c netfilter: nfnetlink_acct: fix nfnl_acct_get operation 2012-01-01 16:36:08 +01:00
nfnetlink_log.c netfilter: Remove unnecessary OOM logging messages 2011-11-01 09:19:49 +01:00
nfnetlink_queue.c netfilter: nf_queue: reject NF_STOLEN verdicts from userspace 2011-08-30 15:01:20 +02:00
x_tables.c net: Fix files explicitly needing to include module.h 2011-10-31 19:30:28 -04:00
xt_addrtype.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
xt_AUDIT.c ipv6: Add fragment reporting to ipv6_skip_exthdr(). 2011-12-03 09:35:10 -08:00
xt_CHECKSUM.c
xt_CLASSIFY.c
xt_cluster.c
xt_comment.c
xt_connbytes.c Merge branch 'nf-next' of git://1984.lsi.us.es/net-next 2011-12-25 02:21:45 -05:00
xt_connlimit.c
xt_connmark.c
xt_CONNSECMARK.c
xt_conntrack.c netfilter: revert a2361c8735 2011-05-10 12:13:36 +02:00
xt_cpu.c
xt_CT.c netfilter: revert user-space expectation helper support 2012-01-16 14:01:23 +01:00
xt_dccp.c
xt_devgroup.c
xt_DSCP.c netfilter: IPv6: fix DSCP mangle code 2011-05-10 10:00:21 +02:00
xt_dscp.c
xt_ecn.c netfilter: xtables: collapse conditions in xt_ecn 2011-12-27 20:45:25 +01:00
xt_esp.c
xt_hashlimit.c netfilter: xt_hashlimit: fix unused variable warning if IPv6 disabled 2012-01-16 13:40:54 +01:00
xt_helper.c
xt_hl.c netfilter: Reduce switch/case indent 2011-07-01 16:11:15 -07:00
xt_HL.c netfilter: Reduce switch/case indent 2011-07-01 16:11:15 -07:00
xt_IDLETIMER.c netfilter: Remove unnecessary OOM logging messages 2011-11-01 09:19:49 +01:00
xt_iprange.c
xt_ipvs.c
xt_LED.c
xt_length.c
xt_limit.c
xt_mac.c
xt_mark.c
xt_multiport.c
xt_nfacct.c netfilter: xtables: add nfacct match to support extended accounting 2011-12-25 02:43:17 +01:00
xt_NFLOG.c
xt_NFQUEUE.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
xt_NOTRACK.c
xt_osf.c net,rcu: convert call_rcu(xt_osf_finger_free_rcu) to kfree_rcu() 2011-05-07 22:51:12 -07:00
xt_owner.c
xt_physdev.c
xt_pkttype.c
xt_policy.c
xt_quota.c net: Fix files explicitly needing to include module.h 2011-10-31 19:30:28 -04:00
xt_rateest.c netfilter: xt_rateest: fix xt_rateest_mt_checkentry() 2011-07-29 16:24:46 +02:00
xt_RATEEST.c net,rcu: Convert call_rcu(xt_rateest_free_rcu) to kfree_rcu() 2011-07-20 14:10:19 -07:00
xt_realm.c
xt_recent.c
xt_repldata.h
xt_sctp.c
xt_SECMARK.c
xt_set.c Remove redundant linux/version.h includes from net/ 2011-06-21 16:03:17 -07:00
xt_socket.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
xt_state.c
xt_statistic.c net: Fix files explicitly needing to include module.h 2011-10-31 19:30:28 -04:00
xt_string.c
xt_TCPMSS.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
xt_tcpmss.c
xt_TCPOPTSTRIP.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
xt_tcpudp.c
xt_TEE.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
xt_time.c
xt_TPROXY.c net:netfilter: use IS_ENABLED 2011-12-16 15:49:52 -05:00
xt_TRACE.c
xt_u32.c