I've compiled custom kernel:
(linux-3.17.4-gentoo, Linux localhost 3.17.4-gentoo #9 SMP Thu May 21 16:23:08 EEST 2015 x86_64 Intel(R) Core(TM) i3-2350M CPU @ 2.30GHz GenuineIntel GNU/Linux)
and saw some warnings few days ago. Is there any log file where i can see them again?