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tracing: selftests: Add testing a user string to filters
Running the following commands was broken: # cd /sys/kernel/tracing # echo "filename.ustring ~ \"/proc*\"" > events/syscalls/sys_enter_openat/filter # echo 1 > events/syscalls/sys_enter_openat/enable # ls /proc/$$/maps # cat trace And would produce nothing when it should have produced something like: ls-1192 [007] ..... 8169.828333: sys_openat(dfd: ffffffffffffff9c, filename: 7efc18359904, flags: 80000, mode: 0) Add a test to check this case so that it will be caught if it breaks again. Link: https://lore.kernel.org/linux-trace-kernel/20250417183003.505835fb@gandalf.local.home/ Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Shuah Khan <skhan@linuxfoundation.org> Link: https://lore.kernel.org/20250418101208.38dc81f5@gandalf.local.home Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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