[LTP] [PATCH v3] userfaultfd: Add test using UFFDIO_POISON

[Ricardo Branco]

On 2/19/26 10:54 AM, Andrea Cervesato wrote:
>> +	SAFE_PTHREAD_JOIN(thr, NULL);
>> +	reset_pages();
> This should also go into a cleanup(), otherwise if other syscalls will
> fail (ioctl for instance), memory will be lost.
Will fix this in userfaultfd06.c and then submit another to fix it in 
the rest.

> Also, if I run checkpatch.pl on the code I get:
>
> WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
> #25: FILE: userfaultfd06.c:25:
> +static volatile int poison_fault_seen;
>
> WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
> #26: FILE: userfaultfd06.c:26:
> +static volatile int sigbus_seen;
>
> WARNING: Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst
> #88: FILE: userfaultfd06.c:88:
> +       volatile char dummy;

I've seen volatile being used in tests. There are legitimate uses for 
this, in signal handlers.

> If you have `b4`, please run `b4 prep --check` before sending the patch.
I'm getting:
CRITICAL: This is not a prep-managed branch.

Best,
R.