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| author | Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> | 2017-02-22 19:23:39 +0530 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-03-03 19:07:18 -0300 |
| commit | 35b6f55aa9ba65141f2def0997e23aab13715d3f (patch) | |
| tree | 6769fa4039aed0459c4091c677dce024b8d46bb7 /kernel/trace/trace.c | |
| parent | 90ec5e89e393c76e19afc845d8f88a5dc8315919 (diff) | |
| download | lwn-35b6f55aa9ba65141f2def0997e23aab13715d3f.tar.gz lwn-35b6f55aa9ba65141f2def0997e23aab13715d3f.zip | |
trace/kprobes: Allow return probes with offsets and absolute addresses
Since the kernel includes many non-global functions with same names, we
will need to use offsets from other symbols (typically _text/_stext) or
absolute addresses to place return probes on specific functions. Also,
the core register_kretprobe() API never forbid use of offsets or
absolute addresses with kretprobes.
Allow its use with the trace infrastructure. To distinguish kernels that
support this, update ftrace README to explicitly call this out.
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/183e7ce2921a08c9c755ee9a5da3134febc6695b.1487770934.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index f35109514a01..0ed834d6beb0 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4355,6 +4355,7 @@ static const char readme_msg[] = "\t -:[<group>/]<event>\n" #ifdef CONFIG_KPROBE_EVENTS "\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n" + "place (kretprobe): [<module>:]<symbol>[+<offset>]|<memaddr>\n" #endif #ifdef CONFIG_UPROBE_EVENTS "\t place: <path>:<offset>\n" |