linux-kernel - [PATCH] tools/testing/selftests/livepatch: define max test-syscall processes

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Date: Wed, 29 May 2024 16:19:41 -0400
From: Ryan Sullivan <rysulliv@...hat.com>
To: live-patching@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: mpdesouza@...e.com,
	jpoimboe@...nel.org,
	jikos@...nel.org,
	mbenes@...e.cz,
	pmladek@...e.com,
	joe.lawrence@...hat.com,
	shuah@...nel.org
Subject: [PATCH] tools/testing/selftests/livepatch: define max test-syscall processes

Define a maximum allowable number of pids that can be livepatched in
test-syscall.sh as with extremely large machines the output from a
large number of processes overflows the dev/kmsg "expect" buffer in
the "check_result" function and causes a false error.

Reported-by: CKI Project <cki-project@...hat.com>
Signed-off-by: Ryan Sullivan <rysulliv@...hat.com>
---
 tools/testing/selftests/livepatch/test-syscall.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/livepatch/test-syscall.sh b/tools/testing/selftests/livepatch/test-syscall.sh
index b76a881d4013..289eb7d4c4b3 100755
--- a/tools/testing/selftests/livepatch/test-syscall.sh
+++ b/tools/testing/selftests/livepatch/test-syscall.sh
@@ -15,7 +15,10 @@ setup_config
 
 start_test "patch getpid syscall while being heavily hammered"
 
-for i in $(seq 1 $(getconf _NPROCESSORS_ONLN)); do
+NPROC=$(getconf _NPROCESSORS_ONLN)
+MAXPROC=128
+
+for i in $(seq 1 $(($NPROC < $MAXPROC ? $NPROC : $MAXPROC))); do
 	./test_klp-call_getpid &
 	pids[$i]="$!"
 done
-- 
2.44.0