Commit-ID: 52b166af40faec9813cd5ac26d6ba9adec2e3a9d
Gitweb: http://git.kernel.org/tip/52b166af40faec9813cd5ac26d6ba9adec2e3a9d
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Tue, 20 Jun 2017 01:37:42 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 22 Jun 2017 18:21:21 +0200
x86/apic: Move online masking to core code
All implementations of apic->cpu_mask_to_apicid_and() mask out the offline
cpus. The callsite already has a mask available, which has the offline CPUs
removed. Use that and remove the extra bits.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Link: http://lkml.kernel.org/r/20170619235446.560868224@xxxxxxxxxxxxx
---
arch/x86/kernel/apic/apic.c | 27 +++++++++------------------
arch/x86/kernel/apic/vector.c | 5 ++++-
arch/x86/kernel/apic/x2apic_cluster.c | 25 +++++++++----------------
3 files changed, 22 insertions(+), 35 deletions(-)
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index e9b322f..8a0bde3 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2205,19 +2205,12 @@ int default_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
const struct cpumask *andmask,
unsigned int *apicid)
{
- unsigned int cpu;
+ unsigned int cpu = cpumask_first_and(cpumask, andmask);
- for_each_cpu_and(cpu, cpumask, andmask) {
- if (cpumask_test_cpu(cpu, cpu_online_mask))
- break;
- }
-
- if (likely(cpu < nr_cpu_ids)) {
- *apicid = per_cpu(x86_cpu_to_apicid, cpu);
- return 0;
- }
-
- return -EINVAL;
+ if (cpu >= nr_cpu_ids)
+ return -EINVAL;
+ *apicid = per_cpu(x86_cpu_to_apicid, cpu);
+ return 0;
}
int flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
@@ -2226,14 +2219,12 @@ int flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
{
unsigned long cpu_mask = cpumask_bits(cpumask)[0] &
cpumask_bits(andmask)[0] &
- cpumask_bits(cpu_online_mask)[0] &
APIC_ALL_CPUS;
- if (likely(cpu_mask)) {
- *apicid = (unsigned int)cpu_mask;
- return 0;
- }
- return -EINVAL;
+ if (!cpu_mask)
+ return -EINVAL;
+ *apicid = (unsigned int)cpu_mask;
+ return 0;
}
/*
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 47c5d01..0f94ddb 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -221,8 +221,11 @@ success:
* Cache destination APIC IDs into cfg->dest_apicid. This cannot fail
* as we already established, that mask & d->domain & cpu_online_mask
* is not empty.
+ *
+ * vector_searchmask is a subset of d->domain and has the offline
+ * cpus masked out.
*/
- BUG_ON(apic->cpu_mask_to_apicid_and(mask, d->domain,
+ BUG_ON(apic->cpu_mask_to_apicid_and(mask, vector_searchmask,
&d->cfg.dest_apicid));
return 0;
}
diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c
index 5a35f20..d73baa8 100644
--- a/arch/x86/kernel/apic/x2apic_cluster.c
+++ b/arch/x86/kernel/apic/x2apic_cluster.c
@@ -108,31 +108,24 @@ x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
const struct cpumask *andmask,
unsigned int *apicid)
{
+ unsigned int cpu;
u32 dest = 0;
u16 cluster;
- int i;
-
- for_each_cpu_and(i, cpumask, andmask) {
- if (!cpumask_test_cpu(i, cpu_online_mask))
- continue;
- dest = per_cpu(x86_cpu_to_logical_apicid, i);
- cluster = x2apic_cluster(i);
- break;
- }
- if (!dest)
+ cpu = cpumask_first_and(cpumask, andmask);
+ if (cpu >= nr_cpu_ids)
return -EINVAL;
- for_each_cpu_and(i, cpumask, andmask) {
- if (!cpumask_test_cpu(i, cpu_online_mask))
- continue;
- if (cluster != x2apic_cluster(i))
+ dest = per_cpu(x86_cpu_to_logical_apicid, cpu);
+ cluster = x2apic_cluster(cpu);
+
+ for_each_cpu_and(cpu, cpumask, andmask) {
+ if (cluster != x2apic_cluster(cpu))
continue;
- dest |= per_cpu(x86_cpu_to_logical_apicid, i);
+ dest |= per_cpu(x86_cpu_to_logical_apicid, cpu);
}
*apicid = dest;
-
return 0;
}
--
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
|