Commit db7f47cf authored by Paul Menage's avatar Paul Menage Committed by Linus Torvalds

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: default avatarLi Zefan <>
Signed-off-by: default avatarPaul Menage <>
Cc: Ingo Molnar <>
Cc: Peter Zijlstra <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent a1bc5a4e
......@@ -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
......@@ -517,6 +517,7 @@ static int validate_change(const struct cpuset *cur, const struct cpuset *trial)
return 0;
* 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)
if (val < -1 || val >= SD_LV_MAX)
return -EINVAL;
if (val != cs->relax_domain_level) {
cs->relax_domain_level = val;
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