linux-kernel - Re: [PATCH v3 3/3] selftests/livepatch: Test interaction with ftrace

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Date:   Thu, 17 Oct 2019 12:55:05 +0530
From:   Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
To:     Joe Lawrence <joe.lawrence@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>, rostedt@...dmis.org,
        mingo@...hat.com, jpoimboe@...hat.com, jikos@...nel.org,
        pmladek@...e.com
Cc:     linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
        shuah@...nel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v3 3/3] selftests/livepatch: Test interaction with
 ftrace_enabled

On 10/17/19 3:17 AM, Joe Lawrence wrote:
> On 10/16/19 1:06 PM, Kamalesh Babulal wrote:
>> On 10/16/19 5:03 PM, Miroslav Benes wrote:
>>> From: Joe Lawrence <joe.lawrence@...hat.com>
>>>
>>> Since livepatching depends upon ftrace handlers to implement "patched"
>>> code functionality, verify that the ftrace_enabled sysctl value
>>> interacts with livepatch registration as expected.  At the same time,
>>> ensure that ftrace_enabled is set and part of the test environment
>>> configuration that is saved and restored when running the selftests.
>>>
>>> Signed-off-by: Joe Lawrence <joe.lawrence@...hat.com>
>>> Signed-off-by: Miroslav Benes <mbenes@...e.cz>
>>
>> [...]
>>> diff --git a/tools/testing/selftests/livepatch/test-ftrace.sh b/tools/testing/selftests/livepatch/test-ftrace.sh
>>> new file mode 100755
>>> index 000000000000..e2a76887f40a
>>> --- /dev/null
>>> +++ b/tools/testing/selftests/livepatch/test-ftrace.sh
>>
>> This test fails due to wrong file permissions, with the warning:
>>
>> # Warning: file test-ftrace.sh is not executable, correct this.
>> not ok 4 selftests: livepatch: test-ftrace.sh
>>
> 
> Hi Kamalesh,
> 
> Thanks for testing.  This error is weird as the git log says new file mode: 100755.  'git am' of Miroslav's patchset gives me a new test-ftrace.sh with "Access: (0775/-rwxrwxr-x)"  Did you apply the mbox directly or.. ?
> 

Hi Joe,

Thanks, I was using patch command to apply the patches and using git am
helped. Sorry for the noise. The test cases passes now, without the issue
I previously reported:

[...]
# TEST: livepatch interaction with ftrace_enabled sysctl ... ok
ok 4 selftests: livepatch: test-ftrace.sh

Long story is that the patch command version installed on the test machine
doesn't understand new file mode permission from the git diff, updating
the patch version creates the patch with 755 mode.

-- 
Kamalesh