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Frederic Weisbecker 5928c3cc0f tracing/filters: support for operator reserved characters in strings 
When we set a filter for an event, such as:

echo "name == my_lock_name" > \
	/debug/tracing/events/lockdep/lock_acquired/filter

then the following order of token type is parsed:

- space
- operator
- parentheses
- operand

Because the operators and parentheses have a higher precedence
than the operand characters, which is normal, then we can't
use any string containing such special characters:

()=<>!&|

To get this support and also avoid ambiguous intepretation from
the parser or the human, we can do it using double quotes so that
we keep the usual languages habits.

Then after this patch you can still declare string condition like
before:

echo name == myname

But if you want to compare against a string containing an operator
character, you can use double quotes:

echo 'name == "&myname"'

Don't forget to include the whole expression into single quotes or
the double ones will be eaten by echo.

[ Impact: support strings with special characters for tracing filters ]

Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Zhaolei <zhaolei@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
 		2009-05-07 10:05:57 +02:00
..
irq tracing: fix build failure on s390 2009-04-29 14:06:21 +02:00
power PM/Hibernate: Wait for SCSI devices scan to complete during resume 2009-04-13 11:37:07 -07:00
time
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trace tracing/filters: support for operator reserved characters in strings 2009-05-07 10:05:57 +02:00
.gitignore
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Kconfig.freezer
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Kconfig.hz
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Kconfig.preempt
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Makefile Merge branch 'linus' into core/softlockup 2009-04-07 11:15:40 +02:00
acct.c
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async.c
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audit.c Audit: remove spaces from audit_log_d_path 2009-04-05 13:49:04 -04:00
audit.h
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audit_tree.c audit: incorrect ref counting in audit tree tag_chunk 2009-04-05 13:48:26 -04:00
auditfilter.c make the e->rule.xxx shorter in kernel auditfilter.c 2009-04-05 13:40:33 -04:00
auditsc.c Audit: remove spaces from audit_log_d_path 2009-04-05 13:49:04 -04:00
backtracetest.c
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bounds.c
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capability.c
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cgroup.c memcg: fix OOM killer under memcg 2009-04-02 19:04:55 -07:00
cgroup_debug.c debug cgroup: remove unneeded cgroup_lock 2009-04-02 19:04:54 -07:00
cgroup_freezer.c
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compat.c
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configs.c
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cpu.c cpumask: use set_cpu_active in init/main.c 2009-03-30 22:05:12 +10:30
cpuset.c cpusets: prevent PF_THREAD_BOUND tasks from attaching to non-root cpusets 2009-04-02 19:04:57 -07:00
cred-internals.h
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cred.c
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delayacct.c
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dma-coherent.c
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dma.c
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exec_domain.c Get rid of indirect include of fs_struct.h 2009-03-31 23:00:27 -04:00
exit.c tracing/events: move trace point headers into include/trace/events 2009-04-14 22:05:43 -04:00
extable.c Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-05 11:04:19 -07:00
fork.c tracing/events: move trace point headers into include/trace/events 2009-04-14 22:05:43 -04:00
freezer.c
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futex.c futex: comment requeue key reference semantics 2009-04-02 23:39:53 +02:00
futex_compat.c
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hrtimer.c hrtimer: fix rq->lock inversion (again) 2009-03-31 14:52:52 +02:00
hung_task.c
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itimer.c
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kallsyms.c Ksplice: Add functions for walking kallsyms symbols 2009-03-31 13:05:32 +10:30
kexec.c kexec: vmcoreinfo_data[] can become static 2009-04-02 19:05:04 -07:00
kfifo.c
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kgdb.c
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kmod.c module: create a request_module_nowait() 2009-03-31 13:05:35 +10:30
kprobes.c kprobes: support per-kprobe disabling 2009-04-07 08:31:08 -07:00
ksysfs.c
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kthread.c tracing/events: move trace point headers into include/trace/events 2009-04-14 22:05:43 -04:00
latencytop.c
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lockdep.c tracing/events: move trace point headers into include/trace/events 2009-04-14 22:05:43 -04:00
lockdep_internals.h
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lockdep_proc.c
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lockdep_states.h
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marker.c
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module.c ftrace: use module notifier for function tracer 2009-04-17 16:59:15 +02:00
mutex-debug.c
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mutex-debug.h
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mutex.c mutex: have non-spinning mutexes on s390 by default 2009-04-09 19:28:24 +02:00
mutex.h
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notifier.c
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ns_cgroup.c cgroups: relax ns_can_attach checks to allow attaching to grandchild cgroups 2009-04-02 19:04:53 -07:00
nsproxy.c
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panic.c lockdep: continue lock debugging despite some taints 2009-04-12 16:10:52 +02:00
params.c param: fix charp parameters set via sysfs 2009-03-31 13:05:30 +10:30
pid.c pids: refactor vnr/nr_ns helpers to make them safe 2009-04-02 19:05:02 -07:00
pid_namespace.c signals: zap_pid_ns_process() should use force_sig() 2009-04-02 19:04:58 -07:00
pm_qos_params.c
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posix-cpu-timers.c Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-09 10:37:28 -07:00
posix-timers.c
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printk.c Merge branch 'printk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-05 10:23:25 -07:00
profile.c
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ptrace.c ptrace: some checkpatch fixes 2009-04-08 10:21:44 -07:00
rcuclassic.c kmemtrace, rcu: fix linux/rcutree.h and linux/rcuclassic.h dependencies 2009-04-03 12:23:02 +02:00
rcupdate.c rcu: rcu_barrier VS cpu_hotplug: Ensure callbacks in dead cpu are migrated to online cpu 2009-03-31 00:09:37 +02:00
rcupreempt.c kmemtrace, rcu: fix rcupreempt.c data structure dependencies 2009-04-03 12:23:04 +02:00
rcupreempt_trace.c
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rcutorture.c cpumask: convert rcutorture.c 2009-03-30 22:05:16 +10:30
rcutree.c kmemtrace, rcu: fix rcu_tree_trace.c data structure dependencies 2009-04-03 12:23:03 +02:00
rcutree.h kmemtrace, rcu: fix rcu_tree_trace.c data structure dependencies 2009-04-03 12:23:03 +02:00
rcutree_trace.c kmemtrace, rcu: fix rcu_tree_trace.c data structure dependencies 2009-04-03 12:23:03 +02:00
relay.c Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-05 11:04:19 -07:00
res_counter.c
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resource.c
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rtmutex-debug.c
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rtmutex-debug.h
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rtmutex-tester.c
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rtmutex.c
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rtmutex.h
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rtmutex_common.h
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rwsem.c
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sched.c tracepoint: trace_sched_migrate_task(): remove parameter 2009-05-06 12:15:51 +02:00
sched_clock.c Merge branch 'tracing/core-v2' into tracing-for-linus 2009-04-02 00:49:02 +02:00
sched_cpupri.c sched_rt: don't allocate cpumask in fastpath 2009-04-01 13:24:51 +02:00
sched_cpupri.h cpumask: remove cpumask_t from core 2009-03-30 22:05:17 +10:30
sched_debug.c
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sched_fair.c
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sched_features.h Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-03-30 17:17:35 -07:00
sched_idletask.c
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sched_rt.c Merge commit 'v2.6.30-rc1' into sched/urgent 2009-04-08 17:26:00 +02:00
sched_stats.h
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seccomp.c
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semaphore.c
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signal.c tracing/events: move trace point headers into include/trace/events 2009-04-14 22:05:43 -04:00
slow-work.c Document the slow work thread pool 2009-04-03 16:42:35 +01:00
smp.c
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softirq.c tracing: fix build failure on s390 2009-04-29 14:06:21 +02:00
softlockup.c
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spinlock.c Allow rwlocks to re-enable interrupts 2009-04-02 19:05:11 -07:00
srcu.c
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stacktrace.c
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stop_machine.c cpumask: remove cpumask_t from core 2009-03-30 22:05:17 +10:30
sys.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-04-02 21:09:10 -07:00
sys_ni.c
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sysctl.c Merge branch 'core/softlockup' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-07 14:11:07 -07:00
sysctl_check.c
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taskstats.c
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test_kprobes.c
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time.c
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timeconst.pl
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timer.c Merge branches 'core-fixes-for-linus', 'irq-fixes-for-linus' and 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-09 10:35:30 -07:00
tracepoint.c
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tsacct.c
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uid16.c
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up.c
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user.c
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user_namespace.c
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utsname.c
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utsname_sysctl.c proc_sysctl: use CONFIG_PROC_SYSCTL around ipc and utsname proc_handlers 2009-04-02 19:05:01 -07:00
wait.c
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workqueue.c work_on_cpu(): rewrite it to create a kernel thread on demand 2009-04-09 09:50:37 +09:30