diff options
authorPaul Menage <menage@google.com>2009-04-02 16:57:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-02 19:04:57 -0700
commitdb7f47cf4805e30decb0841764b21b7c4000f7dc (patch)
parenta1bc5a4eee990a1f290735c8694d0aebdad095fa (diff)
cpusets: allow cpusets to be configured/built on non-SMP systems
Allow cpusets to be configured/built on non-SMP systems Currently it's impossible to build cpusets under UML on x86-64, since cpusets depends on SMP and x86-64 UML doesn't support SMP. There's code in cpusets that doesn't depend on SMP. This patch surrounds the minimum amount of cpusets code with #ifdef CONFIG_SMP in order to allow cpusets to build/run on UP systems (for testing purposes under UML). Reviewed-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Paul Menage <menage@google.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2 files changed, 16 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 92d41060393..1398a14b019 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -531,7 +531,7 @@ config CGROUP_DEVICE
config CPUSETS
bool "Cpuset support"
- depends on SMP && CGROUPS
+ depends on CGROUPS
This option will let you create and manage CPUSETs which
allow dynamically partitioning a system into sets of CPUs and
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 3ff910eb30d..2b93b50cbe4 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -517,6 +517,7 @@ static int validate_change(const struct cpuset *cur, const struct cpuset *trial)
return 0;
+#ifdef CONFIG_SMP
* Helper routine for generate_sched_domains().
* Do cpusets a, b have overlapping cpus_allowed masks?
@@ -811,6 +812,18 @@ static void do_rebuild_sched_domains(struct work_struct *unused)
+#else /* !CONFIG_SMP */
+static void do_rebuild_sched_domains(struct work_struct *unused)
+static int generate_sched_domains(struct cpumask **domains,
+ struct sched_domain_attr **attributes)
+ *domains = NULL;
+ return 1;
+#endif /* CONFIG_SMP */
static DECLARE_WORK(rebuild_sched_domains_work, do_rebuild_sched_domains);
@@ -1164,8 +1177,10 @@ int current_cpuset_is_being_rebound(void)
static int update_relax_domain_level(struct cpuset *cs, s64 val)
+#ifdef CONFIG_SMP
if (val < -1 || val >= SD_LV_MAX)
return -EINVAL;
if (val != cs->relax_domain_level) {
cs->relax_domain_level = val;