[LTP] syscalls/file_attr01: Dynamically expect EOPNOTSUPP on tmpfs without xattr

[linuxtestproject.agent@gmail.com]

Hi Wake,

On Wed, 29 Apr 2026, Wake Liu wrote:
> syscalls/file_attr01: Dynamically expect EOPNOTSUPP on tmpfs without xattr

> +	if (tc->ufattr == (struct file_attr **)(&null_ptr) && missing_tmpfs_xattr)
> +		exp_errno = EOPNOTSUPP;

The override is scoped only to the null-ufattr tcase. The commit message says
the kernel checks xattr support "before dereferencing the user pointer", which
raises the question of whether usize validation (EINVAL/E2BIG tcases) also
occurs after the support check. If so, those tcases would also return
EOPNOTSUPP on tmpfs without xattr and need the same treatment. Please clarify
the kernel's validation order for usize relative to the xattr support check.

> Changes in v3:
[...]
> Changes in v2:
[...]

Version changelogs should be stripped from the commit message before merging;
they belong in the cover letter only.

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