1 files changed, 9 insertions, 0 deletions

diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c
index dea80d4357f0..3dcb080c44a0 100644
--- a/arch/um/kernel/process_kern.c
+++ b/arch/um/kernel/process_kern.c
@@ -466,12 +466,21 @@ int singlestepping(void * t)
         return 2;
 }
 
+/*
+ * Only x86 and x86_64 have an arch_align_stack().
+ * All other arches have "#define arch_align_stack(x) (x)"
+ * in their asm/system.h
+ * As this is included in UML from asm-um/system-generic.h,
+ * we can use it to behave as the subarch does.
+ */
+#ifndef arch_align_stack
 unsigned long arch_align_stack(unsigned long sp)
 {
         if (randomize_va_space)
                 sp -= get_random_int() % 8192;
         return sp & ~0xf;
 }
+#endif
 
 
 /*