[PATCH 3/8] cpumask: Optimize cpumask_of_cpu in arch/x86/kernel/ldt.c

[Mike Travis]

  * Optimize various places where a pointer to the cpumask_of_cpu value
    will result in reducing stack pressure.

Based on linux-2.6.tip/master at the following commit:

    commit 0a91813e16ebd5c2d9b5c2acd5b7c91742112c4f
    Merge: 9a635fa... 724dce0...
    Author: Ingo Molnar <mingo@xxxxxxx>
    Date:   Tue Jul 15 14:55:17 2008 +0200

Signed-off-by: Mike Travis <travis@xxxxxxx>
---
 arch/x86/kernel/ldt.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- linux-2.6.tip.orig/arch/x86/kernel/ldt.c
+++ linux-2.6.tip/arch/x86/kernel/ldt.c
@@ -62,12 +62,12 @@ static int alloc_ldt(mm_context_t *pc, i
 
 	if (reload) {
 #ifdef CONFIG_SMP
-		cpumask_t mask;
+		cpumask_of_cpu_ptr_declare(mask);
 
 		preempt_disable();
 		load_LDT(pc);
-		mask = cpumask_of_cpu(smp_processor_id());
-		if (!cpus_equal(current->mm->cpu_vm_mask, mask))
+		cpumask_of_cpu_ptr_next(mask, smp_processor_id());
+		if (!cpus_equal(current->mm->cpu_vm_mask, *mask))
 			smp_call_function(flush_ldt, current->mm, 1);
 		preempt_enable();
 #else

-- 
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