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authorAnton Vorontsov <anton.vorontsov@linaro.org>2012-07-17 14:26:15 -0700
committerAnton Vorontsov <anton.vorontsov@linaro.org>2012-09-06 22:16:58 -0700
commit65f8c95e46a1827ae8bbc52a817ea308dd7d65ae (patch)
treeadc856e8b50441b055350d8f1d83e3f641c77456 /fs/pstore/internal.h
parentb4a871bce619dc5ca03cc6c78e1c467ceacb8e7e (diff)
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pstore/ftrace: Convert to its own enable/disable debugfs knob
With this patch we no longer reuse function tracer infrastructure, now we register our own tracer back-end via a debugfs knob. It's a bit more code, but that is the only downside. On the bright side we have: - Ability to make persistent_ram module removable (when needed, we can move ftrace_ops struct into a module). Note that persistent_ram is still not removable for other reasons, but with this patch it's just one thing less to worry about; - Pstore part is more isolated from the generic function tracer. We tried it already by registering our own tracer in available_tracers, but that way we're loosing ability to see the traces while we record them to pstore. This solution is somewhere in the middle: we only register "internal ftracer" back-end, but not the "front-end"; - When there is only pstore tracing enabled, the kernel will only write to the pstore buffer, omitting function tracer buffer (which, of course, still can be enabled via 'echo function > current_tracer'). Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Diffstat (limited to 'fs/pstore/internal.h')
-rw-r--r--fs/pstore/internal.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/pstore/internal.h b/fs/pstore/internal.h
index 0d0d3b7..4847f58 100644
--- a/fs/pstore/internal.h
+++ b/fs/pstore/internal.h
@@ -39,6 +39,12 @@ pstore_ftrace_decode_cpu(struct pstore_ftrace_record *rec)
#endif
}
+#ifdef CONFIG_PSTORE_FTRACE
+extern void pstore_register_ftrace(void);
+#else
+static inline void pstore_register_ftrace(void) {}
+#endif
+
extern struct pstore_info *psinfo;
extern void pstore_set_kmsg_bytes(int);
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