[PATCH 10/12] UML - S390 preparation, arch_align_stack

[Jeff Dike]

From: Bodo Stroesser <bstroesser@xxxxxxxxxxxxxxxxxxx>

Only x86 and x86_64 use arch_align_stack(), all other subarches
have:
 #define arch_align_stack(x) (x)
So, if this definition is found, UML's own arch_align_stack()
should be skipped.

Signed-off-by: Bodo Stroesser <bstroesser@xxxxxxxxxxxxxxxxxxx>
Index: linux-2.6.11-mm/arch/um/kernel/process_kern.c
===================================================================
--- linux-2.6.11-mm.orig/arch/um/kernel/process_kern.c	2005-04-30 13:13:04.000000000 -0400
+++ linux-2.6.11-mm/arch/um/kernel/process_kern.c	2005-04-30 13:20:41.000000000 -0400
@@ -462,12 +462,21 @@
 	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
 
 
 /*

-
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