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a773d41927
By passing an export descriptor to the write function, users don't need to keep a global static pointer and can rely on container_of() to fetch their own structure. Link: http://lkml.kernel.org/r/20170602102025.5140-1-felipe.balbi@linux.intel.com Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Reviewed-by: Chunyan Zhang <zhang.chunyan@linaro.org> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
30 lines
964 B
C
30 lines
964 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_TRACE_H
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#define _LINUX_TRACE_H
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#ifdef CONFIG_TRACING
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/*
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* The trace export - an export of Ftrace output. The trace_export
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* can process traces and export them to a registered destination as
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* an addition to the current only output of Ftrace - i.e. ring buffer.
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*
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* If you want traces to be sent to some other place rather than ring
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* buffer only, just need to register a new trace_export and implement
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* its own .write() function for writing traces to the storage.
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*
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* next - pointer to the next trace_export
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* write - copy traces which have been delt with ->commit() to
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* the destination
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*/
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struct trace_export {
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struct trace_export __rcu *next;
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void (*write)(struct trace_export *, const void *, unsigned int);
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};
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int register_ftrace_export(struct trace_export *export);
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int unregister_ftrace_export(struct trace_export *export);
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#endif /* CONFIG_TRACING */
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#endif /* _LINUX_TRACE_H */
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