From: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Date: Sat, 7 May 2005 04:30:53 +0000 (-0700)
Subject: [PATCH] uml: S390 preparation, arch_align_stack
X-Git-Tag: v2.6.12-rc4~3
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b8bd0220c1ac6273eda66e25d992654219f846b6;p=linux-2.6

[PATCH] uml: S390 preparation, arch_align_stack

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@fujitsu-siemens.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/arch/um/kernel/process_kern.c b/arch/um/kernel/process_kern.c
index dea80d4357..3dcb080c44 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
 
 
 /*