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Date: Thu, 22 Jun 2017 09:51:29 -0700
From: tip-bot for Thomas Gleixner <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: axboe@...nel.dk, marc.zyngier@....com, hch@....de,
peterz@...radead.org, mpe@...erman.id.au, hpa@...or.com,
tglx@...utronix.de, keith.busch@...el.com,
linux-kernel@...r.kernel.org, mingo@...nel.org
Subject: [tip:irq/core] genirq: Remove mask argument from setup_affinity()
Commit-ID: cba4235e6031e9318d68186f6d765c531cbea4e1
Gitweb: http://git.kernel.org/tip/cba4235e6031e9318d68186f6d765c531cbea4e1
Author: Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Tue, 20 Jun 2017 01:37:21 +0200
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 22 Jun 2017 18:21:14 +0200
genirq: Remove mask argument from setup_affinity()
No point to have this alloc/free dance of cpumasks. Provide a static mask
for setup_affinity() and protect it proper.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Marc Zyngier <marc.zyngier@....com>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: Keith Busch <keith.busch@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Christoph Hellwig <hch@....de>
Link: http://lkml.kernel.org/r/20170619235444.851571573@linutronix.de
---
kernel/irq/internals.h | 2 +-
kernel/irq/manage.c | 53 ++++++++++++++++++++++----------------------------
kernel/irq/proc.c | 8 +++++---
3 files changed, 29 insertions(+), 34 deletions(-)
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index 094db5b..33ca838 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -109,7 +109,7 @@ static inline void unregister_handler_proc(unsigned int irq,
extern bool irq_can_set_affinity_usr(unsigned int irq);
-extern int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask);
+extern int irq_select_affinity_usr(unsigned int irq);
extern void irq_set_thread_affinity(struct irq_desc *desc);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 284f4eb..e2f20d5 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -345,15 +345,18 @@ EXPORT_SYMBOL_GPL(irq_set_affinity_notifier);
/*
* Generic version of the affinity autoselector.
*/
-static int setup_affinity(struct irq_desc *desc, struct cpumask *mask)
+static int irq_setup_affinity(struct irq_desc *desc)
{
struct cpumask *set = irq_default_affinity;
- int node = irq_desc_get_node(desc);
+ int ret, node = irq_desc_get_node(desc);
+ static DEFINE_RAW_SPINLOCK(mask_lock);
+ static struct cpumask mask;
/* Excludes PER_CPU and NO_BALANCE interrupts */
if (!__irq_can_set_affinity(desc))
return 0;
+ raw_spin_lock(&mask_lock);
/*
* Preserve the managed affinity setting and a userspace affinity
* setup, but make sure that one of the targets is online.
@@ -367,43 +370,42 @@ static int setup_affinity(struct irq_desc *desc, struct cpumask *mask)
irqd_clear(&desc->irq_data, IRQD_AFFINITY_SET);
}
- cpumask_and(mask, cpu_online_mask, set);
+ cpumask_and(&mask, cpu_online_mask, set);
if (node != NUMA_NO_NODE) {
const struct cpumask *nodemask = cpumask_of_node(node);
/* make sure at least one of the cpus in nodemask is online */
- if (cpumask_intersects(mask, nodemask))
- cpumask_and(mask, mask, nodemask);
+ if (cpumask_intersects(&mask, nodemask))
+ cpumask_and(&mask, &mask, nodemask);
}
- irq_do_set_affinity(&desc->irq_data, mask, false);
- return 0;
+ ret = irq_do_set_affinity(&desc->irq_data, &mask, false);
+ raw_spin_unlock(&mask_lock);
+ return ret;
}
#else
/* Wrapper for ALPHA specific affinity selector magic */
-static inline int setup_affinity(struct irq_desc *d, struct cpumask *mask)
+int irq_setup_affinity(struct irq_desc *desc)
{
- return irq_select_affinity(irq_desc_get_irq(d));
+ return irq_select_affinity(irq_desc_get_irq(desc));
}
#endif
/*
- * Called when affinity is set via /proc/irq
+ * Called when a bogus affinity is set via /proc/irq
*/
-int irq_select_affinity_usr(unsigned int irq, struct cpumask *mask)
+int irq_select_affinity_usr(unsigned int irq)
{
struct irq_desc *desc = irq_to_desc(irq);
unsigned long flags;
int ret;
raw_spin_lock_irqsave(&desc->lock, flags);
- ret = setup_affinity(desc, mask);
+ ret = irq_setup_affinity(desc);
raw_spin_unlock_irqrestore(&desc->lock, flags);
return ret;
}
-
#else
-static inline int
-setup_affinity(struct irq_desc *desc, struct cpumask *mask)
+static inline int setup_affinity(struct irq_desc *desc)
{
return 0;
}
@@ -1128,7 +1130,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
struct irqaction *old, **old_ptr;
unsigned long flags, thread_mask = 0;
int ret, nested, shared = 0;
- cpumask_var_t mask;
if (!desc)
return -EINVAL;
@@ -1187,11 +1188,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
}
}
- if (!alloc_cpumask_var(&mask, GFP_KERNEL)) {
- ret = -ENOMEM;
- goto out_thread;
- }
-
/*
* Drivers are often written to work w/o knowledge about the
* underlying irq chip implementation, so a request for a
@@ -1256,7 +1252,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
*/
if (thread_mask == ~0UL) {
ret = -EBUSY;
- goto out_mask;
+ goto out_unlock;
}
/*
* The thread_mask for the action is or'ed to
@@ -1300,7 +1296,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
pr_err("Threaded irq requested with handler=NULL and !ONESHOT for irq %d\n",
irq);
ret = -EINVAL;
- goto out_mask;
+ goto out_unlock;
}
if (!shared) {
@@ -1308,7 +1304,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
if (ret) {
pr_err("Failed to request resources for %s (irq %d) on irqchip %s\n",
new->name, irq, desc->irq_data.chip->name);
- goto out_mask;
+ goto out_unlock;
}
init_waitqueue_head(&desc->wait_for_threads);
@@ -1320,7 +1316,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
if (ret) {
irq_release_resources(desc);
- goto out_mask;
+ goto out_unlock;
}
}
@@ -1357,7 +1353,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
}
/* Set default affinity mask once everything is setup */
- setup_affinity(desc, mask);
+ irq_setup_affinity(desc);
} else if (new->flags & IRQF_TRIGGER_MASK) {
unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK;
@@ -1401,8 +1397,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
irq_add_debugfs_entry(irq, desc);
new->dir = NULL;
register_handler_proc(irq, new);
- free_cpumask_var(mask);
-
return 0;
mismatch:
@@ -1415,9 +1409,8 @@ mismatch:
}
ret = -EBUSY;
-out_mask:
+out_unlock:
raw_spin_unlock_irqrestore(&desc->lock, flags);
- free_cpumask_var(mask);
out_thread:
if (new->thread) {
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index c53edad..d35bb8d 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -120,9 +120,11 @@ static ssize_t write_irq_affinity(int type, struct file *file,
* one online CPU still has to be targeted.
*/
if (!cpumask_intersects(new_value, cpu_online_mask)) {
- /* Special case for empty set - allow the architecture
- code to set default SMP affinity. */
- err = irq_select_affinity_usr(irq, new_value) ? -EINVAL : count;
+ /*
+ * Special case for empty set - allow the architecture code
+ * to set default SMP affinity.
+ */
+ err = irq_select_affinity_usr(irq) ? -EINVAL : count;
} else {
irq_set_affinity(irq, new_value);
err = count;
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