[LTP] [PATCH] mlock_8-1, munlock_10-1: don't use LONG_MAX as invalid pointer

[Petr Vorel]

Hi Jan,

> arm64 kernel with commit 057d3389108e ("mm: untag user pointers passed to
> memory syscalls") will assume this is tagged user pointer and will
> attempt to clear first byte. This leads to test hitting different error
> (EINVAL instead of ENOMEM).

> Add a helper function which provides invalid/unused pointer from user
> address space.

> Signed-off-by: Jan Stancek <jstancek@redhat.com>
Reviewed-by: Petr Vorel <pvorel@suse.cz>

Agree with Cyril points (double underscores at the beginning are reserved for
libc and putting very brief info at get_invalid_ptr(().

Kind regards,
Petr