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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-12-09 18:49:50 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-12 13:47:21 +0100 |
| commit | ee79d1bdb6a10499e53f80b1e8d14110215178ba (patch) | |
| tree | e9273d48cadb0b2ba77865e3405ad5e3e9664ff9 | |
| parent | c1dfdc7597d051b09555d4ae2acb90403e238746 (diff) | |
| download | kernel_samsung_smdk4412-ee79d1bdb6a10499e53f80b1e8d14110215178ba.zip kernel_samsung_smdk4412-ee79d1bdb6a10499e53f80b1e8d14110215178ba.tar.gz kernel_samsung_smdk4412-ee79d1bdb6a10499e53f80b1e8d14110215178ba.tar.bz2 | |
sched: let arch_update_cpu_topology indicate if topology changed
Change arch_update_cpu_topology so it returns 1 if the cpu topology changed
and 0 if it didn't change. This will be useful for the next patch which adds
a call to this function in partition_sched_domains.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/s390/kernel/topology.c | 5 | ||||
| -rw-r--r-- | include/linux/topology.h | 2 | ||||
| -rw-r--r-- | kernel/sched.c | 8 |
3 files changed, 11 insertions, 4 deletions
diff --git a/arch/s390/kernel/topology.c b/arch/s390/kernel/topology.c index a947899..bf96f1b 100644 --- a/arch/s390/kernel/topology.c +++ b/arch/s390/kernel/topology.c @@ -212,7 +212,7 @@ static void update_cpu_core_map(void) cpu_core_map[cpu] = cpu_coregroup_map(cpu); } -void arch_update_cpu_topology(void) +int arch_update_cpu_topology(void) { struct tl_info *info = tl_info; struct sys_device *sysdev; @@ -221,7 +221,7 @@ void arch_update_cpu_topology(void) if (!machine_has_topology) { update_cpu_core_map(); topology_update_polarization_simple(); - return; + return 0; } stsi(info, 15, 1, 2); tl_to_cores(info); @@ -230,6 +230,7 @@ void arch_update_cpu_topology(void) sysdev = get_cpu_sysdev(cpu); kobject_uevent(&sysdev->kobj, KOBJ_CHANGE); } + return 1; } static void topology_work_fn(struct work_struct *work) diff --git a/include/linux/topology.h b/include/linux/topology.h index 117f1b7..0c5b5ac 100644 --- a/include/linux/topology.h +++ b/include/linux/topology.h @@ -49,7 +49,7 @@ for_each_online_node(node) \ if (nr_cpus_node(node)) -void arch_update_cpu_topology(void); +int arch_update_cpu_topology(void); /* Conform to ACPI 2.0 SLIT distance definitions */ #define LOCAL_DISTANCE 10 diff --git a/kernel/sched.c b/kernel/sched.c index ef212da..fcfbbd9 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -7675,8 +7675,14 @@ static struct sched_domain_attr *dattr_cur; */ static cpumask_t fallback_doms; -void __attribute__((weak)) arch_update_cpu_topology(void) +/* + * arch_update_cpu_topology lets virtualized architectures update the + * cpu core maps. It is supposed to return 1 if the topology changed + * or 0 if it stayed the same. + */ +int __attribute__((weak)) arch_update_cpu_topology(void) { + return 0; } /* |