riscv: ignore nanosleep syscall

Change-Id: I564a09564da668a5db3e75f15b33efaca363d71a
Reviewed-on: https://gem5-review.googlesource.com/c/9624
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Jason Lowe-Power <jason@lowepower.com>
diff --git a/src/arch/riscv/linux/process.cc b/src/arch/riscv/linux/process.cc
index 03104b2..7239920 100644
--- a/src/arch/riscv/linux/process.cc
+++ b/src/arch/riscv/linux/process.cc
@@ -188,7 +188,7 @@
     {98,   SyscallDesc("futex", futexFunc<RiscvLinux64>)},
     {99,   SyscallDesc("set_robust_list", ignoreFunc, SyscallDesc::WarnOnce)},
     {100,  SyscallDesc("get_robust_list", ignoreFunc, SyscallDesc::WarnOnce)},
-    {101,  SyscallDesc("nanosleep")},
+    {101,  SyscallDesc("nanosleep", ignoreFunc, SyscallDesc::WarnOnce)},
     {102,  SyscallDesc("getitimer")},
     {103,  SyscallDesc("setitimer")},
     {104,  SyscallDesc("kexec_load")},