arch-riscv: Ignore set_robust_list and get_robust_list syscalls

Change-Id: I5a4744e5aed07337144af9f07978b83405b6695b
Reviewed-on: https://gem5-review.googlesource.com/6902
Reviewed-by: Alec Roelke <ar4jc@virginia.edu>
Maintainer: Alec Roelke <ar4jc@virginia.edu>
diff --git a/src/arch/riscv/linux/process.cc b/src/arch/riscv/linux/process.cc
index 53dbbc2..4c10efe 100644
--- a/src/arch/riscv/linux/process.cc
+++ b/src/arch/riscv/linux/process.cc
@@ -168,8 +168,8 @@
     {96,   SyscallDesc("set_tid_address", setTidAddressFunc)},
     {97,   SyscallDesc("unshare")},
     {98,   SyscallDesc("futex", futexFunc<RiscvLinux>)},
-    {99,   SyscallDesc("set_robust_list")},
-    {100,  SyscallDesc("get_robust_list")},
+    {99,   SyscallDesc("set_robust_list", ignoreFunc, SyscallDesc::WarnOnce)},
+    {100,  SyscallDesc("get_robust_list", ignoreFunc, SyscallDesc::WarnOnce)},
     {101,  SyscallDesc("nanosleep")},
     {102,  SyscallDesc("getitimer")},
     {103,  SyscallDesc("setitimer")},