[PATCH 2.6.18] x86_64: silence warning when stack unwinding is disabled

[Mikael Pettersson <mikpe@it.uu.se>]

Compiling kernel 2.6.18 on x86_64 with CONFIG_STACK_UNWIND=n gives:

arch/x86_64/kernel/traps.c: In function 'show_trace':
arch/x86_64/kernel/traps.c:287: warning: cast to pointer from integer of different size

This is because UNW_SP() evaluates to 0, of type int, which
is cast to a pointer by traps.c. Fix: evaluate to 0UL instead.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>

--- linux-2.6.18/include/asm-x86_64/unwind.h.~1~	2006-09-20 19:28:57.000000000 +0200
+++ linux-2.6.18/include/asm-x86_64/unwind.h	2006-09-20 20:17:52.000000000 +0200
@@ -95,7 +95,7 @@ static inline int arch_unw_user_mode(con
 #else
 
 #define UNW_PC(frame) ((void)(frame), 0)
-#define UNW_SP(frame) ((void)(frame), 0)
+#define UNW_SP(frame) ((void)(frame), 0UL)
 
 static inline int arch_unw_user_mode(const void *info)
 {
-
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