[LTP] pipe15: add min kver v4.4.281

[linuxtestproject.agent@gmail.com]

Hi Po-Hsu,

On Fri, Jun 12, 2026, Po-Hsu Lin wrote:
> pipe15: add min kver v4.4.281

> This patch 46c4c9d1beb7 has been backported to stable v4.4 with
> commit 7392701d8615 on linux-4.4.y starting from tag v4.4.281 [1]

"This patch 46c4c9d1beb7" is ambiguous. In the context of a patch
submission, "this patch" reads as if it refers to the current LTP
patch. Something like "Upstream commit 46c4c9d1beb7 has been
backported..." would be clearer.

Also, the body describes the fact that a backport happened but does
not explain *why* adding min_kver to pipe15 is needed. What problem
does this solve? Does the test TBROK on older 4.4.x kernels because
/proc/sys/fs/pipe-user-pages-soft is missing? Or does it hang
because the fix is absent?

If the sysctl was never present on 4.4.x before 4.4.281, then the
min_kver is legitimate feature gating and the commit message should
say so. If the sysctl did exist but the hang fix was missing, then
skipping the test would mask the bug on those kernels, which
conflicts with the LTP policy of not working around kernel bugs.

Verdict: Needs revision

Pre-existing: the tags array at line 95 is missing the required
{} null terminator (see tst_test.h: "@tags: A {} terminated
array").

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