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Date:	Tue,  6 Oct 2015 17:21:55 +0200
From:	Rasmus Villemoes <>
To:	Rusty Russell <>,
	Greg Kroah-Hartman <>,
	Oleg Nesterov <>,
	Thomas Gleixner <>
Cc:	Michael Ellerman <>,
	Rasmus Villemoes <>,
Subject: [PATCH v2 2/6] kernel/cpu.c: change type of cpu_possible_bits and friends

Change cpu_possible_bits and friends (online, present, active) from
being bitmaps that happen to have the right size to actually being
struct cpumasks. Also rename them to __cpu_xyz_mask. This is mostly a
small cleanup in preparation for exporting them and, eventually,
eliminating the extra indirection through the cpu_xyz_mask variables.

Acked-by: Rusty Russell <>
Signed-off-by: Rasmus Villemoes <>
 kernel/cpu.c | 44 ++++++++++++++++++++++----------------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 82cf9dff4295..fea4a3ce3011 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -772,71 +772,71 @@ const DECLARE_BITMAP(cpu_all_bits, NR_CPUS) = CPU_BITS_ALL;
-static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly
+static struct cpumask __cpu_possible_mask __read_mostly
-static DECLARE_BITMAP(cpu_possible_bits, CONFIG_NR_CPUS) __read_mostly;
+static struct cpumask __cpu_possible_mask __read_mostly;
-const struct cpumask *const cpu_possible_mask = to_cpumask(cpu_possible_bits);
+const struct cpumask *const cpu_possible_mask = &__cpu_possible_mask;
-static DECLARE_BITMAP(cpu_online_bits, CONFIG_NR_CPUS) __read_mostly;
-const struct cpumask *const cpu_online_mask = to_cpumask(cpu_online_bits);
+static struct cpumask __cpu_online_mask __read_mostly;
+const struct cpumask *const cpu_online_mask = &__cpu_online_mask;
-static DECLARE_BITMAP(cpu_present_bits, CONFIG_NR_CPUS) __read_mostly;
-const struct cpumask *const cpu_present_mask = to_cpumask(cpu_present_bits);
+static struct cpumask __cpu_present_mask __read_mostly;
+const struct cpumask *const cpu_present_mask = &__cpu_present_mask;
-static DECLARE_BITMAP(cpu_active_bits, CONFIG_NR_CPUS) __read_mostly;
-const struct cpumask *const cpu_active_mask = to_cpumask(cpu_active_bits);
+static struct cpumask __cpu_active_mask __read_mostly;
+const struct cpumask *const cpu_active_mask = &__cpu_active_mask;
 void set_cpu_possible(unsigned int cpu, bool possible)
 	if (possible)
-		cpumask_set_cpu(cpu, to_cpumask(cpu_possible_bits));
+		cpumask_set_cpu(cpu, &__cpu_possible_mask);
-		cpumask_clear_cpu(cpu, to_cpumask(cpu_possible_bits));
+		cpumask_clear_cpu(cpu, &__cpu_possible_mask);
 void set_cpu_present(unsigned int cpu, bool present)
 	if (present)
-		cpumask_set_cpu(cpu, to_cpumask(cpu_present_bits));
+		cpumask_set_cpu(cpu, &__cpu_present_mask);
-		cpumask_clear_cpu(cpu, to_cpumask(cpu_present_bits));
+		cpumask_clear_cpu(cpu, &__cpu_present_mask);
 void set_cpu_online(unsigned int cpu, bool online)
 	if (online) {
-		cpumask_set_cpu(cpu, to_cpumask(cpu_online_bits));
-		cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits));
+		cpumask_set_cpu(cpu, &__cpu_online_mask);
+		cpumask_set_cpu(cpu, &__cpu_active_mask);
 	} else {
-		cpumask_clear_cpu(cpu, to_cpumask(cpu_online_bits));
+		cpumask_clear_cpu(cpu, &__cpu_online_mask);
 void set_cpu_active(unsigned int cpu, bool active)
 	if (active)
-		cpumask_set_cpu(cpu, to_cpumask(cpu_active_bits));
+		cpumask_set_cpu(cpu, &__cpu_active_mask);
-		cpumask_clear_cpu(cpu, to_cpumask(cpu_active_bits));
+		cpumask_clear_cpu(cpu, &__cpu_active_mask);
 void init_cpu_present(const struct cpumask *src)
-	cpumask_copy(to_cpumask(cpu_present_bits), src);
+	cpumask_copy(&__cpu_present_mask, src);
 void init_cpu_possible(const struct cpumask *src)
-	cpumask_copy(to_cpumask(cpu_possible_bits), src);
+	cpumask_copy(&__cpu_possible_mask, src);
 void init_cpu_online(const struct cpumask *src)
-	cpumask_copy(to_cpumask(cpu_online_bits), src);
+	cpumask_copy(&__cpu_online_mask, src);

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