[LTP] shmctl03: Fix 32-bit compat mode failure by adjusting comparisons for compat mode truncation

[linuxtestproject.agent@gmail.com]

Hi Wei,

On Thu, 30 Apr 2026, Wei Gao wrote:
> shmctl03: Fix 32-bit compat mode failure by adjusting comparisons for
> compat mode truncation

> +#define TST_ASSERT_SATURATED_INT   0x01
[...]
> +	if (flags & TST_ASSERT_SATURATED_INT) {
> +		if (sys_val_64 > (unsigned long long)INT_MAX)
> +			expected_val = (unsigned long)INT_MAX;

For shmmax in compat mode, can you confirm the saturation is to INT_MAX
(2^31-1) rather than UINT_MAX (2^32-1)?  The compat_shminfo64.shmmax
field is __compat_ulong_t (unsigned 32-bit), so truncation to UINT_MAX
would be the natural expectation.  A reference to the relevant kernel
compat code path in ipc/shm.c would help clarify.

Pre-existing issues noticed in the surrounding code (not introduced
by this patch):

- testcases/kernel/syscalls/ipc/shmctl/shmctl03.c:13 — #include
  "tse_newipc.h" appears unused; no symbols from it are referenced.

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