cpumask updates for um

The following changes since commit 5bee17f18b595937e6beafeee5197868a3f74a06:
Kyle McMartin (1):
parisc: sba_iommu: fix build bug when CONFIG_PARISC_AGP=y

are available in the git repository at:

ssh://master.kernel.org/home/ftp/pub/scm/linux/kernel/git/rusty/linux-2.6-cpumask-for-um.git master

Rusty Russell (3):
cpumask: prepare for iterators to only go to nr_cpu_ids/nr_cpumask_bits.: um
cpumask: Use accessors code.: um
cpumask: use mm_cpumask() wrapper: um

 arch/um/include/asm/mmu_context.h |    4 ++--
 arch/um/kernel/smp.c              |    2 +-
 arch/um/kernel/um_arch.c          |    2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

commit 9ca79a68564459385c0a8db903ec6ffe6b00c50c

Author: Rusty Russell <[email protected]>
Date:   Mon Mar 16 14:27:41 2009 +1030

cpumask: use mm_cpumask() wrapper: um

Makes code futureproof against the impending change to mm->cpu_vm_mask.

It's also a chance to use the new cpumask_ ops which take a pointer (the older ones are deprecated, but there's no hurry for arch code).

index 54f42e8..edd719e 100644
@@ -35,8 +35,8 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	unsigned cpu = smp_processor_id();
 
 	if(prev != next){
-		cpu_clear(cpu, prev->cpu_vm_mask);
-		cpu_set(cpu, next->cpu_vm_mask);
+		cpumask_clear(cpu, mm_cpumask(prev));
+		cpumask_set_cpu(cpu, mm_cpumask(next));
 		if(next != &init_mm)
 			__switch_mm(&next->context.id);
 	}

commit 577e3b46d67a0dc236a9eb89c06861a8b4580a02

Author: Rusty Russell <[email protected]>
Date:   Mon Mar 16 14:27:41 2009 +1030

cpumask: Use accessors code.: um

Impact: use new API

Use the accessors rather than frobbing bits directly. Most of this is in arch code I haven't even compiled, but is straightforward.

index 98351c7..106bf27 100644
@@ -111,7 +111,7 @@ void smp_prepare_cpus(unsigned int maxcpus)
 	int i;
 
 	for (i = 0; i < ncpus; ++i)
-		cpu_set(i, cpu_possible_map);
+		set_cpu_possible(i, true);
 
 	cpu_clear(me, cpu_online_map);
 	cpu_set(me, cpu_online_map);

commit 816a1c29fc3d9bb95dde5806c29629d16947bfe7

Author: Rusty Russell <[email protected]>
Date:   Mon Mar 16 14:27:40 2009 +1030

cpumask: prepare for iterators to only go to nr_cpu_ids/nr_cpumask_bits.: um

Impact: cleanup, futureproof

In fact, all cpumask ops will only be valid (in general) for bit numbers < nr_cpu_ids. So use that instead of NR_CPUS in various places.

This is always safe: no cpu number can be >= nr_cpu_ids, and nr_cpu_ids is initialized to NR_CPUS at boot.

index 8d84250..bbf96ab 100644
@@ -80,7 +80,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 
 static void *c_start(struct seq_file *m, loff_t *pos)
 {
-	return *pos < NR_CPUS ? cpu_data + *pos : NULL;
+	return *pos < nr_cpu_ids ? cpu_data + *pos : NULL;
 }
 
 static void *c_next(struct seq_file *m, void *v, loff_t *pos)