diff options
| author | Andrew Morton <akpm@osdl.org> | 2004-06-23 18:50:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-06-23 18:50:29 -0700 |
| commit | d2cec97bc421d6f9c2ee0d9bd8e0ce47d0022cac (patch) | |
| tree | 527641d4a33f472af4e9b233f65108e7cf0a96d1 /kernel | |
| parent | 8c1ce9d6d628945ff23f844dbe9f21f5d5383b99 (diff) | |
| download | history-d2cec97bc421d6f9c2ee0d9bd8e0ce47d0022cac.tar.gz | |
[PATCH] cpumask: make cpu_present_map real even on non-smp
From: Paul Jackson <pj@sgi.com>
This patch makes cpu_present_map a real map for all configurations, instead of
a constant for non-SMP. It also moves the definition of cpu_present_map out
of kernel/cpu.c into kernel/sched.c, because cpu.c isn't compiled into non-SMP
kernels.
The pattern is that each of the possible, present and online cpu maps are
actual kernel global cpumask_t variables, for all configurations. They are
documented in include/linux/cpumask.h. Some of the UP (NR_CPUS=1) code
cheats, and hardcodes the assumption that the single bit position of these
maps is always set, as an optimization.
Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cpu.c | 8 | ||||
| -rw-r--r-- | kernel/sched.c | 10 |
2 files changed, 10 insertions, 8 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 72b984c67eb32d..083521327e64dc 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -20,14 +20,6 @@ DECLARE_MUTEX(cpucontrol); static struct notifier_block *cpu_chain; -/* - * Represents all cpu's present in the system - * In systems capable of hotplug, this map could dynamically grow - * as new cpu's are detected in the system via any platform specific - * method, such as ACPI for e.g. - */ -cpumask_t cpu_present_map; -EXPORT_SYMBOL(cpu_present_map); /* Need to know about CPUs going up/down? */ int register_cpu_notifier(struct notifier_block *nb) diff --git a/kernel/sched.c b/kernel/sched.c index 8f49ba1202c3a4..a614d7ebf7c3af 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2941,6 +2941,16 @@ out_unlock: return retval; } +/* + * Represents all cpu's present in the system + * In systems capable of hotplug, this map could dynamically grow + * as new cpu's are detected in the system via any platform specific + * method, such as ACPI for e.g. + */ + +cpumask_t cpu_present_map; +EXPORT_SYMBOL(cpu_present_map); + /** * sys_sched_getaffinity - get the cpu affinity of a process * @pid: pid of the process |