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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-11-27 00:13:34 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-12-02 00:52:34 +0100 |
| commit | b32614c03413f8a6025d8677c2b7c0ee976e63d4 (patch) | |
| tree | 31033ddc3ce2320c4f4faec012b7bfec6199b550 /include/linux/ring_buffer.h | |
| parent | 14660b7ea3ca628410bb999d53926ca77973892b (diff) | |
| download | linux-b32614c03413f8a6025d8677c2b7c0ee976e63d4.tar.gz | |
tracing/rb: Convert to hotplug state machine
Install the callbacks via the state machine. The notifier in struct
ring_buffer is replaced by the multi instance interface. Upon
__ring_buffer_alloc() invocation, cpuhp_state_add_instance() will invoke
the trace_rb_cpu_prepare() on each CPU.
This callback may now fail. This means __ring_buffer_alloc() will fail and
cleanup (like previously) and during a CPU up event this failure will not
allow the CPU to come up.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20161126231350.10321-7-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/ring_buffer.h')
| -rw-r--r-- | include/linux/ring_buffer.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/ring_buffer.h b/include/linux/ring_buffer.h index 4acc552e9279..b6d4568795a7 100644 --- a/include/linux/ring_buffer.h +++ b/include/linux/ring_buffer.h @@ -198,4 +198,10 @@ enum ring_buffer_flags { RB_FL_OVERWRITE = 1 << 0, }; +#ifdef CONFIG_RING_BUFFER +int trace_rb_cpu_prepare(unsigned int cpu, struct hlist_node *node); +#else +#define trace_rb_cpu_prepare NULL +#endif + #endif /* _LINUX_RING_BUFFER_H */ |