pussuw commented on code in PR #5985:
URL: https://github.com/apache/incubator-nuttx/pull/5985#discussion_r844298516


##########
arch/risc-v/src/common/riscv_percpu.c:
##########
@@ -86,13 +92,39 @@ void riscv_percpu_init(void)
 
 void riscv_percpu_add_hart(uintptr_t hartid)
 {
-  /* Hart IDs go from 0...4 */
+  riscv_percpu_t *percpu;
+  uintptr_t       stack_top;
+
+  /* Get free entry for this hart, this must not fail */
+
+  percpu = (riscv_percpu_t *)sq_remfirst(&g_freelist);
+  DEBUGASSERT(percpu);
+
+  /* Get interrupt stack (if any) */
+
+  stack_top = 0;

Review Comment:
   stack_top = (uintptr_t)&g_intstacktop;
   
   ^-  is this guaranteed to be 0/NULL if g_intstacktop is not defined, does 
the linker do relocation fix or something ?



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