[LTP] tse_swap: Add fallback definitions for swapon

[linuxtestproject.agent@gmail.com]

Hi Andrea,

On August 28, 2026, Andrea Cervesato wrote:
> tse_swap: Add fallback definitions for swapon

--- [PATCH 2/3] ---

> +	if (tst_syscall(__NR_swapoff, loop_dev) != 0)
> +		tst_brk(TBROK | TTERRNO, "swapoff(%s) failed", loop_dev);
> [...]
> +	if (swap_active && tst_syscall(__NR_swapoff, loop_dev) != 0)
> +		tst_res(TWARN | TTERRNO, "swapoff(%s) failed", loop_dev);

Could these reports use TERRNO instead? These calls bypass TEST(), so
TTERRNO reads the TST_ERR left by the earlier successful swapon() call.
That value is normally zero, causing a real swapoff() failure to be
reported as "Success".

> +/*\
> + * Check that :manpage:`swapon(2)` discard flags control swapon-time area discard:
> [...]
> +	.needs_root = 1,

Could the description state why root is required? Root-only tests are
expected to document the reason; here swapon(), swapoff(), and loop-device
setup require it.

--- [PATCH 3/3] ---

> +	if (TST_RET == 0 && tst_syscall(__NR_swapoff, tc->path) != 0)
> +		tst_res(TWARN | TTERRNO, "swapoff(%s) failed", tc->path);

Could this use TERRNO as well? On this recovery path the preceding
TST_EXP_FAIL() captured a successful swapon(), leaving TST_ERR equal to
zero, so TTERRNO cannot report the swapoff() failure's errno.

Verdict - Needs revision

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