linux-kernel - Re: [PATCH] selftests: breakpoints: convert breakpoint_test

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Date:   Wed, 28 Jun 2017 01:50:09 +0900
From:   Paul Elder <paul.elder@...t.edu>
To:     Shuah Khan <shuahkh@....samsung.com>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     panand@...hat.com, will.deacon@....com, labath@...gle.com,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH] selftests: breakpoints: convert breakpoint_test_arm64
 test to TAP13

On 06/28/2017 01:36 AM, Shuah Khan wrote:
> On 06/27/2017 10:11 AM, Greg KH wrote:
>> On Tue, Jun 27, 2017 at 10:04:47AM -0600, Shuah Khan wrote:
>>> Convert breakpoint_test_arm64 output to TAP13 format.
>>>
>>> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
>>> ---
>>>  .../selftests/breakpoints/breakpoint_test_arm64.c  | 114 ++++++++++++++-------
>>>  1 file changed, 79 insertions(+), 35 deletions(-)
>>>
>>> diff --git a/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c b/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c
>>> index fa6d57af5217..d13bd0dea13e 100644
>>> --- a/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c
>>> +++ b/tools/testing/selftests/breakpoints/breakpoint_test_arm64.c
>>> @@ -41,20 +41,27 @@ static volatile uint8_t var[96] __attribute__((__aligned__(32)));
>>>  static void child(int size, int wr)
>>>  {
>>>  	volatile uint8_t *addr = &var[32 + wr];
>>> +	char msg_buf[512];
>>>  
>>>  	if (ptrace(PTRACE_TRACEME, 0, NULL, NULL) != 0) {
>>> -		perror("ptrace(PTRACE_TRACEME) failed");
>>> -		_exit(1);
>>> +		snprintf(msg_buf, sizeof(msg_buf),
>>> +			 "ptrace(PTRACE_TRACEME) failed: %s\n",
>>> +			 strerror(errno));
>>> +		ksft_exit_fail_msg(msg_buf);
>>
>> No objection to this patch, but perhaps the "msg" functions could either
>> be variable arg macros, or just a printk() like function that can take
>> the string and anything you want to send to it.
> 
> Right. Changing "msg" functions to take var args will make things easier.
> I will take care of that and use this test for a use-case.
I was going to work on this...
Do you want to take care of it or can I do it?

Thank you,

Paul

>>
>> So this could be:
>> 		ksft_exit_fail_msg("ptrace(PTRACE_TRACEME) failed: %s\n", strerror(errno));
> 
> Right.
> 
>>
>> Anyway, just a thought, might make conversions a lot easier, no need for
>> intermediate buffers> 
>> thanks,
>>
>> greg k-h
>>
> 
> thanks,
> -- Shuah
>