The debug_mode enables:
 - reporting about unknown kernel options in the config,
 - showing all checks from all supported platforms,
 - verbose printing of ComplexOptChecks (OR, AND).

This fixes the false positive report about LDISC_AUTOLOAD for old kernels

Nice, like it :)

And move config_checklist to other globals by the way.

This option is now enabled by default in case of compiler support.

Refers to PR #31.

Thanks to @HacKurx for his work.

config check is finished: 'OK' - 74 / 'FAIL' - 49

config check is finished: 'OK' - 50 / 'FAIL' - 73

No need to support old stable versions

config check is finished: 'OK' - 44 / 'FAIL' - 79

config check is finished: 'OK' - 55 / 'FAIL' - 68

config check is finished: 'OK' - 36 / 'FAIL' - 87

config check is finished: 'OK' - 47 / 'FAIL' - 76

config check is finished: 'OK' - 87 / 'FAIL' - 36

config check is finished: 'OK' - 84 / 'FAIL' - 39

config check is finished: 'OK' - 52 / 'FAIL' - 71

config check is finished: 'OK' - 47 / 'FAIL' - 76

config check is finished: 'OK' - 54 / 'FAIL' - 69

PAGE_POISONING is a debugging feature.
It provides less erasing than INIT_ON_FREE_DEFAULT_ON.
Join these checks with OR giving preference to INIT_ON_FREE_DEFAULT_ON.

Thanks to @madaidan for the details.

Also drop my previous recommendations about CONFIG_PAGE_POISONING_NO_SANITY
and CONFIG_PAGE_POISONING_ZERO.

Thanks to @madaidan
Refers to #29

The vivid driver is for testing. It doesn't require any special hardware.
It is shipped in Ubuntu, Debian, Arch Linux, SUSE Linux Enterprise and openSUSE.
On Ubuntu the devices created by this driver are available to the normal user,
since Ubuntu applies RW ACL when the user is logged in.

See the disclosure of CVE-2019-18683 which I've found and fixed in vivid driver:
https://www.openwall.com/lists/oss-security/2019/11/02/1