[PATCH][ia64][1/2] bugfix stack layout upside-down

[KAMEZAWA Hiroyuki]

ia64 expects following vm layout
==
[register-stack]
[memory-stack]
==
But, when ulimit -s is used  and stack-base-address-randomization works,
vm layout is sometimes following.
==
[memory-stack]
[register-stack]
==

If this happens,  register-stack cannot be expanded.

This patch fixes this bug by adjusting register-stack.

Signed-Off-By: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

Index: linux-2.6.21-rc4/arch/ia64/mm/init.c
===================================================================
--- linux-2.6.21-rc4.orig/arch/ia64/mm/init.c
+++ linux-2.6.21-rc4/arch/ia64/mm/init.c
@@ -155,7 +155,7 @@ ia64_set_rbs_bot (void)
 
 	if (stack_size > MAX_USER_STACK_SIZE)
 		stack_size = MAX_USER_STACK_SIZE;
-	current->thread.rbs_bot = STACK_TOP - stack_size;
+	current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size);
 }
 
 /*

-
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