[PATCH] powerpc/powernv: Select CONFIG_PRINTK to fix build failure

In an allnoconfig we get the following build failure: arch/powerpc/platforms/built-in.o: In function `.__machine_initcall_powernv_opal_init': opal.c:(.init.text+0x468): undefined reference to `.log_buf_addr_get' opal.c:(.init.text+0x474): undefined reference to `.log_buf_len_get' make: *** [vmlin

[PATCH] srcu: Isolate srcu sections using CONFIG_SRCU

Isolate the SRCU functions and data structures within CONFIG_SRCU so that there is a compile time failure if srcu is used when not enabled. This was decided to be better than waiting until link time for a failure to occur. There are places which include kvm headers and utilize kvm data structures