CC      kernel/power/consoleearlysuspend.o
kernel/power/consoleearlysuspend.c: In function 'console_early_suspend':
kernel/power/consoleearlysuspend.c:28:2: error: implicit declaration of function 'acquire_console_sem' [-Werror=implicit-function-declaration]
  acquire_console_sem();
  ^
kernel/power/consoleearlysuspend.c:34:2: error: implicit declaration of function 'release_console_sem' [-Werror=implicit-function-declaration]
  release_console_sem();
  ^
cc1: some warnings being treated as errors
scripts/Makefile.build:308: recipe for target 'kernel/power/consoleearlysuspend.o' failed
make[2]: *** [kernel/power/consoleearlysuspend.o] Error 1
scripts/Makefile.build:455: recipe for target 'kernel/power' failed
make[1]: *** [kernel/power] Error 2
Makefile:798: recipe for target 'kernel' failed