Reduce dead code, fix aarch64.

src/percpu.rs

@@ -8,7 +8,6 @@ use syscall::PtraceFlags;
 use crate::context::empty_cr3;
 use crate::context::memory::AddrSpaceWrapper;
 use crate::cpu_set::MAX_CPU_COUNT;
-use crate::memory::FreeList;
 use crate::ptrace::Session;
 use crate::{context::switch::ContextSwitchPercpu, cpu_set::LogicalCpuId};
 
@@ -32,8 +31,6 @@ pub struct PercpuBlock {
     #[cfg(feature = "profiling")]
     pub profiling: Option<&'static crate::profiling::RingBuffer>,
 
-    //pub freelist: crate::memory::FreeList,
-
     pub ptrace_flags: Cell<PtraceFlags>,
     pub ptrace_session: RefCell<Option<Weak<Session>>>,
     pub inside_syscall: Cell<bool>,
@@ -141,7 +138,6 @@ impl PercpuBlock {
             ptrace_flags: Cell::new(Default::default()),
             ptrace_session: RefCell::new(None),
             inside_syscall: Cell::new(false),
-            //freelist: FreeList::new(),
 
             #[cfg(feature = "syscall_debug")]
             syscall_debug_info: Cell::new(SyscallDebugInfo::default()),