diff --git a/include/asm-powerpc/kexec.h b/include/asm-powerpc/kexec.h
index e363752276ef349b1792c2b43a78ddc0031e731e..fffdf690b8404548b47d3747a17b521682158038 100644
--- a/include/asm-powerpc/kexec.h
+++ b/include/asm-powerpc/kexec.h
@@ -55,6 +55,12 @@ extern void default_machine_crash_shutdown(struct pt_regs *regs);
 
 #endif /* !CONFIG_KEXEC */
 
+/*
+ * Provide a dummy definition to avoid build failures. Will remain
+ * empty till crash dump support is enabled.
+ */
+static inline void crash_setup_regs(struct pt_regs *newregs,
+					struct pt_regs *oldregs) { }
 #endif /* ! __ASSEMBLY__ */
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_KEXEC_H */
diff --git a/include/asm-s390/kexec.h b/include/asm-s390/kexec.h
index b4809d98fe69139423f71578758d2447b68ed553..ce28ddda0f507266a10e297844e7500d73ff290d 100644
--- a/include/asm-s390/kexec.h
+++ b/include/asm-s390/kexec.h
@@ -36,4 +36,8 @@
 
 #define MAX_NOTE_BYTES 1024
 
+/* Provide a dummy definition to avoid build failures. */
+static inline void crash_setup_regs(struct pt_regs *newregs,
+					struct pt_regs *oldregs) { }
+
 #endif /*_S390_KEXEC_H */