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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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23a4b108ac
The kprobe_eventname.tc test checks if a function with .isra. can have a
kprobe attached to it. It loops through the kallsyms file for all the
functions that have the .isra. name, and checks if it exists in the
available_filter_functions file, and if it does, it uses it to attach a
kprobe to it.
The issue is that kprobes can not attach to functions that are listed more
than once in available_filter_functions. With the latest kernel, the
function that is found is: rapl_event_update.isra.0
# grep rapl_event_update.isra.0 /sys/kernel/tracing/available_filter_functions
rapl_event_update.isra.0
rapl_event_update.isra.0
It is listed twice. This causes the attached kprobe to it to fail which in
turn fails the test. Instead of just picking the function function that is
found in available_filter_functions, pick the first one that is listed
only once in available_filter_functions.
Cc: stable@vger.kernel.org
Fixes: 604e354823 ("selftests/ftrace: Select an existing function in kprobe_eventname test")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.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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# requires: kprobe_events
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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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cnt=`grep -s $f available_filter_functions | wc -l`;
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if [ $cnt -eq 1 ]; 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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