These macros are needed to make sure the compiler does not optimize away
atomic constructs such as "while (!READ_ONCE(foo))" loops that do not
modify foo within the loop
Also move the barrier() define where it belongs while we are here, it is
needed for READ_ONCE/WRITE_ONCE and including ihk/cpu.h here causes
include loops
Change-Id: Ia533a849ed674719ccbc0495be47d22a3c47b8f8
Probably only needed for recent system, see ihk's 3271b5e6 ("fix
compilation with recent glibc (cpu_set define change)")
The root of the problem really is that we rely on system headers for
mckernel that ought to be independent...
Change-Id: Ieb9a017e5a7697ad767087370ced7b615efc917e
Was done in x86_64 for fileobj in commit 249bda4aef ("fileobj: use
MCS locks for per-file page hash")
Change-Id: I61957de336b6657687803e6288afed9360a42032
