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Fri, 20 Feb 2026 06:12:44 -0800 (PST) From: Marcos Paulo de Souza Date: Fri, 20 Feb 2026 11:12:33 -0300 Subject: [PATCH 1/2] selftests: livepatch: test-ftrace: livepatch a traced function Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260220-lp-test-trace-v1-1-4b6703cd01a6@suse.com> References: <20260220-lp-test-trace-v1-0-4b6703cd01a6@suse.com> In-Reply-To: <20260220-lp-test-trace-v1-0-4b6703cd01a6@suse.com> To: Josh Poimboeuf , Jiri Kosina , Miroslav Benes , Petr Mladek , Joe Lawrence , Shuah Khan Cc: live-patching@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Marcos Paulo de Souza X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1771596757; l=2107; i=mpdesouza@suse.com; s=20231031; h=from:subject:message-id; bh=lfkcP3ZdIIOq+1bZXx5CwRguKuxe5MWg0qFqkWJX6To=; b=j0Hy38QFPzn4yRGnk1pGC8agT7SWqZWsfvcqLHUjNE38K6fhxH9e2jAeIpsiR17McRfZSkL8I UAuk8Hzj9wJDaMKCHcPbKQWymB9g+38qIJH2vWs64xRU7cjDGNbk7q5 X-Developer-Key: i=mpdesouza@suse.com; a=ed25519; pk=/Ni/TsKkr69EOmdZXkp1Q/BlzDonbOBRsfPa18ySIwU= This is basically the inverse case of commit 474eecc882ae ("selftests: livepatch: test if ftrace can trace a livepatched function") but ensuring that livepatch would work on a traced function. Signed-off-by: Marcos Paulo de Souza Acked-by: Joe Lawrence Acked-by: Miroslav Benes Reviewed-by: Petr Mladek Tested-by: Petr Mladek --- tools/testing/selftests/livepatch/test-ftrace.sh | 36 ++++++++++++++++++++= ++++ 1 file changed, 36 insertions(+) diff --git a/tools/testing/selftests/livepatch/test-ftrace.sh b/tools/testi= ng/selftests/livepatch/test-ftrace.sh index 094176f1a46a..c6222cc037c5 100755 --- a/tools/testing/selftests/livepatch/test-ftrace.sh +++ b/tools/testing/selftests/livepatch/test-ftrace.sh @@ -95,4 +95,40 @@ livepatch: '$MOD_LIVEPATCH': completing unpatching trans= ition livepatch: '$MOD_LIVEPATCH': unpatching complete % rmmod $MOD_LIVEPATCH" =20 + +# - trace a function +# - verify livepatch can load targgeting no the same traced function +# - check if the livepatch is in effect +# - reset trace and unload livepatch + +start_test "livepatch a traced function and check that the live patch rema= ins in effect" + +FUNCTION_NAME=3D"cmdline_proc_show" + +trace_function "$FUNCTION_NAME" +load_lp $MOD_LIVEPATCH + +if [[ "$(cat /proc/cmdline)" =3D=3D "$MOD_LIVEPATCH: this has been live pa= tched" ]] ; then + log "livepatch: ok" +fi + +check_traced_functions "$FUNCTION_NAME" + +disable_lp $MOD_LIVEPATCH +unload_lp $MOD_LIVEPATCH + +check_result "% insmod test_modules/$MOD_LIVEPATCH.ko +livepatch: enabling patch '$MOD_LIVEPATCH' +livepatch: '$MOD_LIVEPATCH': initializing patching transition +livepatch: '$MOD_LIVEPATCH': starting patching transition +livepatch: '$MOD_LIVEPATCH': completing patching transition +livepatch: '$MOD_LIVEPATCH': patching complete +livepatch: ok +% echo 0 > $SYSFS_KLP_DIR/$MOD_LIVEPATCH/enabled +livepatch: '$MOD_LIVEPATCH': initializing unpatching transition +livepatch: '$MOD_LIVEPATCH': starting unpatching transition +livepatch: '$MOD_LIVEPATCH': completing unpatching transition +livepatch: '$MOD_LIVEPATCH': unpatching complete +% rmmod $MOD_LIVEPATCH" + exit 0 --=20 2.52.0 From nobody Fri Apr 3 12:27:52 2026 Received: from mail-wr1-f53.google.com (mail-wr1-f53.google.com [209.85.221.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D8A9C34C808 for ; 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Fri, 20 Feb 2026 06:12:47 -0800 (PST) Received: from [127.0.0.1] ([2804:5078:822:3100:58f2:fc97:371f:2]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43796a5b2d1sm60119173f8f.4.2026.02.20.06.12.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Feb 2026 06:12:47 -0800 (PST) From: Marcos Paulo de Souza Date: Fri, 20 Feb 2026 11:12:34 -0300 Subject: [PATCH 2/2] selftests: livepatch: functions.sh: Workaround heredoc on older bash Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260220-lp-test-trace-v1-2-4b6703cd01a6@suse.com> References: <20260220-lp-test-trace-v1-0-4b6703cd01a6@suse.com> In-Reply-To: <20260220-lp-test-trace-v1-0-4b6703cd01a6@suse.com> To: Josh Poimboeuf , Jiri Kosina , Miroslav Benes , Petr Mladek , Joe Lawrence , Shuah Khan Cc: live-patching@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Marcos Paulo de Souza X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1771596757; l=1061; i=mpdesouza@suse.com; s=20231031; h=from:subject:message-id; bh=2md64ytofqgo4G1D1UhLCcPUCs8ETnPv72SPqDzXeAg=; b=HHrucUUJHPEYEpVG0/tc4hROqI0nwjtNy9OQC3i47BR+EGbsZw8+fl0tzRFfiFRTi/PSRtxL0 YDBcY5AvBogAdMushsXKWxg9JGQjV0TQHeLldsIsgUrJNndK/VXN7dD X-Developer-Key: i=mpdesouza@suse.com; a=ed25519; pk=/Ni/TsKkr69EOmdZXkp1Q/BlzDonbOBRsfPa18ySIwU= When running current selftests on older distributions like SLE12-SP5 that contains an older bash trips over heredoc. Convert it to plain echo calls, which ends up with the same result. Signed-off-by: Marcos Paulo de Souza Acked-by: Joe Lawrence --- tools/testing/selftests/livepatch/functions.sh | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/livepatch/functions.sh b/tools/testing= /selftests/livepatch/functions.sh index 8ec0cb64ad94..45ed04c6296e 100644 --- a/tools/testing/selftests/livepatch/functions.sh +++ b/tools/testing/selftests/livepatch/functions.sh @@ -96,10 +96,8 @@ function pop_config() { } =20 function set_dynamic_debug() { - cat <<-EOF > "$SYSFS_DEBUG_DIR/dynamic_debug/control" - file kernel/livepatch/* +p - func klp_try_switch_task -p - EOF + echo "file kernel/livepatch/* +p" > "$SYSFS_DEBUG_DIR/dynamic_debug/contr= ol" + echo "func klp_try_switch_task -p" > "$SYSFS_DEBUG_DIR/dynamic_debug/cont= rol" } =20 function set_ftrace_enabled() { --=20 2.52.0