Re: [PATCH v3 3/4] kselftest/arm64: Add tests for SVE vector configuration

On Thu, Jul 29, 2021 at 05:06:42PM +0100, Dave Martin wrote:

On Thu, Jul 29, 2021 at 04:15:17PM +0100, Mark Brown wrote:

quoted

+	child = fork();
+	if (child == -1) {
+		ksft_print_msg("fork() failed: %d (%s)\n",
+			       errno, strerror(errno));
+		close(pipefd[0]);
+		close(pipefd[1]);
+		return -1;

Since nothing reopens pipefd[0] or pipefd[1], you could also follow the
"goto out" convention and just (re)close both fds at the end, rather
than having to repeat the close() multiple times.  But it works as-is.

I find that when fork() gets involved that starts to get confusing since
you have multiple contexts/control flows around and working out which
cleanup path goes where is more of the issue.

quoted

+		if (!WIFEXITED(ret)) {
+			ksft_print_msg("child exited abnormally\n");
+			close(pipefd[0]);
+			return -1;
+		}

The WEXITSTATUS() check could go outside the loop.

OTOH I find that logically it's part of working out what happened with
the child which is what the loop body is doing.  Anyway I changed to the
do/while you suggested.

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