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Fri, 17 Apr 2026 08:21:31 -0700 (PDT) Date: Fri, 17 Apr 2026 17:21:30 +0200 From: Petr Mladek To: Marcos Paulo de Souza Cc: Josh Poimboeuf , Jiri Kosina , Miroslav Benes , Joe Lawrence , Shuah Khan , live-patching@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 4/6] selftests: livepatch: Check if patched sysfs attribute exists Message-ID: References: <20260413-lp-tests-old-fixes-v2-0-367c7cb5006f@suse.com> <20260413-lp-tests-old-fixes-v2-4-367c7cb5006f@suse.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260413-lp-tests-old-fixes-v2-4-367c7cb5006f@suse.com> On Mon 2026-04-13 14:26:15, Marcos Paulo de Souza wrote: > In order to run the selftests on older kernels, check if given kernel > has support for the attribute. If the attribute is not supported, skip > the checks. > > Signed-off-by: Marcos Paulo de Souza > --- > tools/testing/selftests/livepatch/test-sysfs.sh | 38 +++++++++++++++---------- > 1 file changed, 23 insertions(+), 15 deletions(-) > > diff --git a/tools/testing/selftests/livepatch/test-sysfs.sh b/tools/testing/selftests/livepatch/test-sysfs.sh > index 58fe1d96997c..a2d649404a63 100755 > --- a/tools/testing/selftests/livepatch/test-sysfs.sh > +++ b/tools/testing/selftests/livepatch/test-sysfs.sh > @@ -8,6 +8,8 @@ MOD_LIVEPATCH=test_klp_livepatch > MOD_LIVEPATCH2=test_klp_callbacks_demo > MOD_LIVEPATCH3=test_klp_syscall > It would be nice to add a comment in which upstream kernel version the attribute was introduced. It might help to decide when it is time to remove the check, see below. > +HAS_PATCH_ATTR=0 > + > setup_config > > # - load a livepatch and verifies the sysfs entries work as expected > @@ -25,8 +27,12 @@ check_sysfs_rights "$MOD_LIVEPATCH" "stack_order" "-r--r--r--" > check_sysfs_value "$MOD_LIVEPATCH" "stack_order" "1" > check_sysfs_rights "$MOD_LIVEPATCH" "transition" "-r--r--r--" > check_sysfs_value "$MOD_LIVEPATCH" "transition" "0" > -check_sysfs_rights "$MOD_LIVEPATCH" "vmlinux/patched" "-r--r--r--" > -check_sysfs_value "$MOD_LIVEPATCH" "vmlinux/patched" "1" > + > +if does_sysfs_exists "$MOD_LIVEPATCH/vmlinux" "patched"; then > + check_sysfs_rights "$MOD_LIVEPATCH" "vmlinux/patched" "-r--r--r--" > + check_sysfs_value "$MOD_LIVEPATCH" "vmlinux/patched" "1" > + HAS_PATCH_ATTR=1 > +fi > > disable_lp $MOD_LIVEPATCH > > @@ -45,23 +51,24 @@ livepatch: '$MOD_LIVEPATCH': completing unpatching transition > livepatch: '$MOD_LIVEPATCH': unpatching complete > % rmmod $MOD_LIVEPATCH" > > -start_test "sysfs test object/patched" > +if [[ "$HAS_PATCH_ATTR" == "1" ]]; then > + start_test "sysfs test object/patched" > > -MOD_LIVEPATCH=test_klp_callbacks_demo > -MOD_TARGET=test_klp_callbacks_mod > -load_lp $MOD_LIVEPATCH > + MOD_LIVEPATCH=test_klp_callbacks_demo > + MOD_TARGET=test_klp_callbacks_mod > + load_lp $MOD_LIVEPATCH > > -# check the "patch" file changes as target module loads/unloads > -check_sysfs_value "$MOD_LIVEPATCH" "$MOD_TARGET/patched" "0" > -load_mod $MOD_TARGET > -check_sysfs_value "$MOD_LIVEPATCH" "$MOD_TARGET/patched" "1" > -unload_mod $MOD_TARGET > -check_sysfs_value "$MOD_LIVEPATCH" "$MOD_TARGET/patched" "0" > + # check the "patch" file changes as target module loads/unloads > + check_sysfs_value "$MOD_LIVEPATCH" "$MOD_TARGET/patched" "0" > + load_mod $MOD_TARGET > + check_sysfs_value "$MOD_LIVEPATCH" "$MOD_TARGET/patched" "1" > + unload_mod $MOD_TARGET > + check_sysfs_value "$MOD_LIVEPATCH" "$MOD_TARGET/patched" "0" > > -disable_lp $MOD_LIVEPATCH > -unload_lp $MOD_LIVEPATCH > + disable_lp $MOD_LIVEPATCH > + unload_lp $MOD_LIVEPATCH > > -check_result "% insmod test_modules/test_klp_callbacks_demo.ko > + check_result "% insmod test_modules/test_klp_callbacks_demo.ko > livepatch: enabling patch 'test_klp_callbacks_demo' > livepatch: 'test_klp_callbacks_demo': initializing patching transition > test_klp_callbacks_demo: pre_patch_callback: vmlinux > @@ -87,6 +94,7 @@ livepatch: 'test_klp_callbacks_demo': completing unpatching transition > test_klp_callbacks_demo: post_unpatch_callback: vmlinux > livepatch: 'test_klp_callbacks_demo': unpatching complete > % rmmod test_klp_callbacks_demo" > +fi The indentation mismatch (code vs check_results) looks a bit ugly. Well, it is rather common thing in bash scripts. And it might even help to find where the next text starts. I could live with it. But I am a bit biased. I would like to see an ack from a non-SUSE person before taking this ;-) Best Regards, Petr PS: Otherwise, the patchset look good to me, modulo the Sashiko AI comments.