linux-kernel - Re: [PATCH] selftests/livepatch: Ignore NO

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Message-ID: <aKW4CApORh7o73nz@pathway.suse.cz>
Date: Wed, 20 Aug 2025 13:56:56 +0200
From: Petr Mladek <pmladek@...e.com>
To: Ricardo B. Marlière <rbm@...e.com>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>, Jiri Kosina <jikos@...nel.org>,
	Miroslav Benes <mbenes@...e.cz>,
	Joe Lawrence <joe.lawrence@...hat.com>,
	Shuah Khan <shuah@...nel.org>, live-patching@...r.kernel.org,
	linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
	Marcos Paulo de Souza <mpdesouza@...e.com>
Subject: Re: [PATCH] selftests/livepatch: Ignore NO_SUPPORT line in dmesg

On Tue 2025-08-19 14:37:01, Ricardo B. Marlière wrote:
> Some systems might disable unloading a livepatch and when running tests on
> them they fail like the following:
> 
> $ ./run_kselftest.sh -c livepatch
>   TAP version 13
>   1..8
>   # selftests: livepatch: test-livepatch.sh
>   # TEST: basic function patching ... not ok
>   #
>   # --- expected
>   # +++ result
>   # @@ -5,6 +5,7 @@ livepatch: 'test_klp_livepatch': starting
>   #  livepatch: 'test_klp_livepatch': completing patching transition
>   #  livepatch: 'test_klp_livepatch': patching complete
>   #  % echo 0 > /sys/kernel/livepatch/test_klp_livepatch/enabled
>   # +livepatch: attempt to disable live patch test_klp_livepatch, setting
>   NO_SUPPORT taint flag
>   #  livepatch: 'test_klp_livepatch': initializing unpatching transition
>   #  livepatch: 'test_klp_livepatch': starting unpatching transition
>   #  livepatch: 'test_klp_livepatch': completing unpatching transition
>   #
>   # ERROR: livepatch kselftest(s) failed

This seems to be a SUSE-specific feature. The upstream kernel does not
even know the NO_SUPPORT taint flag.

This patch is not for upstream. But we should add it into SUSE
kernel sources.

Best Regards,
Petr