[LTP] tst_clone: Fix child detection on sparc

[linuxtestproject.agent@gmail.com]

Hi Anders,

On Wed, 30 Sep 2026, Anders Roxell wrote:
> tst_clone: Fix child detection on sparc

> +#ifdef __sparc__
> +	if (pid == tid)
> +		pid = 0;
> +#endif

High severity: SPARC copy_thread() returns the caller's global TID, but
tst_gettid() returns its namespace-local TID. In pidns05's nested
CLONE_NEWPID path, tid is 1 while pid is the caller's global TID, so the
child still takes the parent branch and the test waits until timeout.
Use a SPARC syscall wrapper that reads the %o1 child indicator instead
of comparing identifiers from different PID namespaces.

Verdict - Needs revision

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