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From: Ryan Sullivan <rysulliv@redhat.com>
To: live-patching@vger.kernel.org,
	linux-kselftest@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: mpdesouza@suse.com,
	jpoimboe@kernel.org,
	jikos@kernel.org,
	mbenes@suse.cz,
	pmladek@suse.com,
	joe.lawrence@redhat.com,
	shuah@kernel.org
Subject: [PATCH] selftests/livepatch: define max test-syscall processes
Date: Thu,  6 Jun 2024 09:53:48 -0400
Message-ID: <20240606135348.4708-1-rysulliv@redhat.com>
In-Reply-To: <alpine.LSU.2.21.2405311304250.8344@pobox.suse.cz>
References: <alpine.LSU.2.21.2405311304250.8344@pobox.suse.cz>
Precedence: bulk
MIME-Version: 1.0
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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@redhat.com>
Signed-off-by: Ryan Sullivan <rysulliv@redhat.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