Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-12 23:23:03 +00:00
Code Issues Packages Projects Releases Wiki Activity

genirq: Remove mask argument from setup_affinity()

Browse Source 
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@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/20170619235444.851571573@linutronix.de
This commit is contained in:
Thomas Gleixner 2017-06-20 01:37:21 +02:00
parent 8e7b632237
commit cba4235e60
3 changed files with 29 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/irq/internals.h
View File

@ -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);

53
kernel/irq/manage.c
View File

@ -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) {

8
kernel/irq/proc.c
View File

@ -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;