jump label: Tracepoint support for jump labels
Make use of the jump label infrastructure for tracepoints. Signed-off-by: Jason Baron <jbaron@redhat.com> LKML-Reference: <a9ba2056e2c9cf332c3c300b577463ce66ff23a8.1284733808.git.jbaron@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Коммит
8f7b50c514
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@ -17,6 +17,7 @@
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/rcupdate.h>
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#include <linux/jump_label.h>
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struct module;
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struct tracepoint;
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@ -145,7 +146,9 @@ static inline void tracepoint_update_probe_range(struct tracepoint *begin,
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extern struct tracepoint __tracepoint_##name; \
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static inline void trace_##name(proto) \
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{ \
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if (unlikely(__tracepoint_##name.state)) \
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JUMP_LABEL(&__tracepoint_##name.state, do_trace); \
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return; \
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do_trace: \
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__DO_TRACE(&__tracepoint_##name, \
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TP_PROTO(data_proto), \
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TP_ARGS(data_args)); \
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@ -25,6 +25,7 @@
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/jump_label.h>
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extern struct tracepoint __start___tracepoints[];
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extern struct tracepoint __stop___tracepoints[];
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@ -263,7 +264,13 @@ static void set_tracepoint(struct tracepoint_entry **entry,
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* is used.
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*/
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rcu_assign_pointer(elem->funcs, (*entry)->funcs);
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elem->state = active;
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if (!elem->state && active) {
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enable_jump_label(&elem->state);
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elem->state = active;
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} else if (elem->state && !active) {
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disable_jump_label(&elem->state);
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elem->state = active;
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}
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}
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/*
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@ -277,7 +284,10 @@ static void disable_tracepoint(struct tracepoint *elem)
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if (elem->unregfunc && elem->state)
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elem->unregfunc();
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elem->state = 0;
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if (elem->state) {
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disable_jump_label(&elem->state);
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elem->state = 0;
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}
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rcu_assign_pointer(elem->funcs, NULL);
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}
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