Patch "selftests/ftrace: Limit length in subsystem-enable tests" has been added to the 5.10-stable tree

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This is a note to let you know that I've just added the patch titled

    selftests/ftrace: Limit length in subsystem-enable tests

to the 5.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     selftests-ftrace-limit-length-in-subsystem-enable-te.patch
and it can be found in the queue-5.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit faf496c02dce46cc4bddd0a9b71a0554b227e92f
Author: Yuanhe Shu <xiangzao@xxxxxxxxxxxxxxxxx>
Date:   Mon Feb 26 11:18:16 2024 +0800

    selftests/ftrace: Limit length in subsystem-enable tests
    
    commit 1a4ea83a6e67f1415a1f17c1af5e9c814c882bb5 upstream.
    
    While sched* events being traced and sched* events continuously happen,
    "[xx] event tracing - enable/disable with subsystem level files" would
    not stop as on some slower systems it seems to take forever.
    Select the first 100 lines of output would be enough to judge whether
    there are more than 3 types of sched events.
    
    Fixes: 815b18ea66d6 ("ftracetest: Add basic event tracing test cases")
    Cc: stable@xxxxxxxxxxxxxxx
    Signed-off-by: Yuanhe Shu <xiangzao@xxxxxxxxxxxxxxxxx>
    Acked-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
    Acked-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
    Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

diff --git a/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc b/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
index b1ede62498667..b7c8f29c09a97 100644
--- a/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
+++ b/tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc
@@ -18,7 +18,7 @@ echo 'sched:*' > set_event
 
 yield
 
-count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
+count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
 if [ $count -lt 3 ]; then
     fail "at least fork, exec and exit events should be recorded"
 fi
@@ -29,7 +29,7 @@ echo 1 > events/sched/enable
 
 yield
 
-count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
+count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
 if [ $count -lt 3 ]; then
     fail "at least fork, exec and exit events should be recorded"
 fi
@@ -40,7 +40,7 @@ echo 0 > events/sched/enable
 
 yield
 
-count=`cat trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
+count=`head -n 100 trace | grep -v ^# | awk '{ print $5 }' | sort -u | wc -l`
 if [ $count -ne 0 ]; then
     fail "any of scheduler events should not be recorded"
 fi




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