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

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Date:   Tue, 27 Jun 2017 18:11:26 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Shuah Khan <shuahkh@....samsung.com>
Cc:     paul.elder@...t.edu, panand@...hat.com, will.deacon@....com,
        labath@...gle.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests: breakpoints: convert breakpoint_test_arm64
 test to TAP13

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.

So this could be:
		ksft_exit_fail_msg("ptrace(PTRACE_TRACEME) failed: %s\n", strerror(errno));

Anyway, just a thought, might make conversions a lot easier, no need for
intermediate buffers.

thanks,

greg k-h