When my kernel boots up I get this error:

It always shows up. I'm using kernel version 2.6.28 in Gentoo Linux.

How do I get rid of it? Should I care?

Ok, so what's your question?

http://letmegooglethatforyou.com/?q=...on+for+aes-asm

edit: Ok now you have a question. I dunno, do you notice anything broken?

I've already googled and no one seems to know for sure why it happens.

Hey this thread is on the first page of results. Talk about fast.

If compile aes as module seems everything is OK. But if it is compiled as built-in, the error message print during system boot.

Having it as a module should not matter.

bash-3.2# cat /proc/crypto
name : stdrng
driver : krng
module : kernel
priority : 200
refcnt : 1
selftest : passed
type : rng
seedsize : 0

name : aes
driver : aes-generic
module : kernel
priority : 100
refcnt : 1
selftest : passed
type : cipher
blocksize : 16
min keysize : 16
max keysize : 32

name : des3_ede
driver : des3_ede-generic
module : kernel
priority : 0
refcnt : 1
selftest : passed
type : cipher
blocksize : 8
min keysize : 24
max keysize : 24

name : des
driver : des-generic
module : kernel
priority : 0
refcnt : 1
selftest : passed
type : cipher
blocksize : 8
min keysize : 8
max keysize : 8

name : sha512
driver : sha512-generic
module : kernel
priority : 0
refcnt : 1
selftest : passed
type : digest
blocksize : 128
digestsize : 64

name : sha384
driver : sha384-generic
module : kernel
priority : 0
refcnt : 1
selftest : passed
type : digest
blocksize : 128
digestsize : 48

name : sha256
driver : sha256-generic
module : kernel
priority : 0
refcnt : 1
selftest : passed
type : digest
blocksize : 64
digestsize : 32

name : sha224
driver : sha224-generic
module : kernel
priority : 0
refcnt : 1
selftest : passed
type : digest
blocksize : 64
digestsize : 28

name : sha1
driver : sha1-generic
module : kernel
priority : 0
refcnt : 1
selftest : passed
type : digest
blocksize : 64
digestsize : 20

name : md5
driver : md5-generic
module : kernel
priority : 0
refcnt : 1
selftest : passed
type : digest
blocksize : 64
digestsize : 16

name : aes
driver : aes-asm
module : kernel
priority : 200
refcnt : 1
selftest : unknown
type : cipher
blocksize : 16
min keysize : 16
max keysize : 32

As u can see the last one selftest is "unknown", causeing the failure.

I upgraded the linux-headers, recompiled the kernel and glibc and I don't get the error anymore.

Ya, you prolly changed the configuration to either modules or not compiled at all. Either way I suggest dont use any ecryption or crypto that comes with the kernel; rather get it from some place else such as gnupg? or openssl?

The Encryption algorhythms were always builtin. I use TrueCrypt and Luks so I need the kernel based encryption or else they won't work.