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604e354823
Running the ftrace selftests on the latest kernel caused the kprobe_eventname test to fail. It was due to the test that searches for a function with at "dot" in the name and adding a probe to that. Unfortunately, for this test, it picked: optimize_nops.isra.2.cold.4 Which happens to be marked as "__init", which means it no longer exists in the kernel! (kallsyms keeps those function names around for tracing purposes) As only functions that still exist are in the available_filter_functions file, as they are removed when the functions are freed at boot or module exit, have the test search for a function with ".isra." in the name as well as being in the available_filter_functions (if the file exists). Link: http://lkml.kernel.org/r/20190322150923.1b58eca5@gandalf.local.home Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
47 lines
1.3 KiB
Bash
47 lines
1.3 KiB
Bash
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# description: Kprobe event auto/manual naming
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[ -f kprobe_events ] || exit_unsupported # this is configurable
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:;: "Add an event on function without name" ;:
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FUNC=`grep " [tT] .*vfs_read$" /proc/kallsyms | tail -n 1 | cut -f 3 -d " "`
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[ "x" != "x$FUNC" ] || exit_unresolved
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echo "p $FUNC" > kprobe_events
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PROBE_NAME=`echo $FUNC | tr ".:" "_"`
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test -d events/kprobes/p_${PROBE_NAME}_0 || exit_failure
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:;: "Add an event on function with new name" ;:
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echo "p:event1 $FUNC" > kprobe_events
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test -d events/kprobes/event1 || exit_failure
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:;: "Add an event on function with new name and group" ;:
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echo "p:kprobes2/event2 $FUNC" > kprobe_events
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test -d events/kprobes2/event2 || exit_failure
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:;: "Add an event on dot function without name" ;:
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find_dot_func() {
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if [ ! -f available_filter_functions ]; then
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grep -m 10 " [tT] .*\.isra\..*$" /proc/kallsyms | tail -n 1 | cut -f 3 -d " "
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return;
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fi
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grep " [tT] .*\.isra\..*" /proc/kallsyms | cut -f 3 -d " " | while read f; do
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if grep -s $f available_filter_functions; then
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echo $f
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break
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fi
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done
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}
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FUNC=`find_dot_func | tail -n 1`
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[ "x" != "x$FUNC" ] || exit_unresolved
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echo "p $FUNC" > kprobe_events
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EVENT=`grep $FUNC kprobe_events | cut -f 1 -d " " | cut -f 2 -d:`
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[ "x" != "x$EVENT" ] || exit_failure
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test -d events/$EVENT || exit_failure
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