Commit-ID: c38da5692e3a4d5d303c04cbf7e526f1eb761076
Gitweb: http://git.kernel.org/tip/c38da5692e3a4d5d303c04cbf7e526f1eb761076
Author: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
AuthorDate: Wed, 11 Mar 2009 16:33:55 +1030
Commit: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Wed, 18 Mar 2009 13:51:51 +0100
x86: cpumask: x86 mmio-mod.c use cpumask_var_t for downed_cpus
Impact: cleanup, reduce memory usage for CONFIG_CPUMASK_OFFSTACK=y
Part of the "getting rid of obsolete cpumask_t" patch:
1) Use cpumask_var_t: this is a pointer if CONFIG_CPUMASK_OFFSTACK=y
2) Call alloc_cpumask_var() on first entry into enter_uniprocessor()
3) Use modern cpumask_* functions.
Signed-off-by: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Pekka Paalanen <pq@xxxxxx>
LKML-Reference: <200903111633.55952.rusty@xxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/mm/mmio-mod.c | 19 +++++++++++++------
1 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/arch/x86/mm/mmio-mod.c b/arch/x86/mm/mmio-mod.c
index 2c4baa8..c9342ed 100644
--- a/arch/x86/mm/mmio-mod.c
+++ b/arch/x86/mm/mmio-mod.c
@@ -378,27 +378,34 @@ static void clear_trace_list(void)
}
#ifdef CONFIG_HOTPLUG_CPU
-static cpumask_t downed_cpus;
+static cpumask_var_t downed_cpus;
static void enter_uniprocessor(void)
{
int cpu;
int err;
+ if (downed_cpus == NULL &&
+ !alloc_cpumask_var(&downed_cpus, GFP_KERNEL)) {
+ pr_notice(NAME "Failed to allocate mask\n");
+ goto out;
+ }
+
get_online_cpus();
- downed_cpus = cpu_online_map;
- cpu_clear(first_cpu(cpu_online_map), downed_cpus);
+ cpumask_copy(downed_cpus, cpu_online_mask);
+ cpumask_clear_cpu(cpumask_first(cpu_online_mask), downed_cpus);
if (num_online_cpus() > 1)
pr_notice(NAME "Disabling non-boot CPUs...\n");
put_online_cpus();
- for_each_cpu_mask(cpu, downed_cpus) {
+ for_each_cpu(cpu, downed_cpus) {
err = cpu_down(cpu);
if (!err)
pr_info(NAME "CPU%d is down.\n", cpu);
else
pr_err(NAME "Error taking CPU%d down: %d\n", cpu, err);
}
+out:
if (num_online_cpus() > 1)
pr_warning(NAME "multiple CPUs still online, "
"may miss events.\n");
@@ -411,10 +418,10 @@ static void __ref leave_uniprocessor(void)
int cpu;
int err;
- if (cpus_weight(downed_cpus) == 0)
+ if (downed_cpus == NULL || cpumask_weight(downed_cpus) == 0)
return;
pr_notice(NAME "Re-enabling CPUs...\n");
- for_each_cpu_mask(cpu, downed_cpus) {
+ for_each_cpu(cpu, downed_cpus) {
err = cpu_up(cpu);
if (!err)
pr_info(NAME "enabled CPU%d.\n", cpu);
--
To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|