[LTP] Fix hugeshmat05 test failure on lpar with 1GB hugepages.

[linuxtestproject.agent@gmail.com]

Hi Pavithra,

On Mon, 20 Apr 2026, Pavithra wrote:
> Fix hugeshmat05 test failure on lpar with 1GB hugepages.
>
> Modified the test to detect large hugepage sizes (≥1GB) and adjust test sizes accordingly.

The commit body describes what changed but not why the test was failing.
Is shmget failing because N*hpage_size=4GB exceeds what the LPAR can
allocate in one call, or is it a pool exhaustion issue? Please document
the root cause in the commit message.

> +       if (hpage_size >= 1024 * 1024 * 1024)
> +               multiplier = N / 2;
> +       else
> +               multiplier = N;

With multiplier=2 for 1GB pages the test needs at most 2 hugepages at
peak, but .hugepages = {N+1, TST_NEEDS} still requires 5 free 1GB pages
(5 GB). On an LPAR with 2–4 free 1GB hugepages the test still cannot
run. Update .hugepages to match the reduced requirement.

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