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author | Jiang Liu <jiang.liu@linux.intel.com> | 2015-04-14 10:30:10 +0800 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2015-04-24 15:36:55 +0200 |
commit | f7fa7aeeecb7a9abdd5f5d069a71ffb3e99a2a07 (patch) | |
tree | cfdc9b18cdc63da678488b5e6008e40a06ff334b /arch/x86/kernel/apic/vector.c | |
parent | d746d1ebd30c48562a3fb512ab18d5822f137820 (diff) | |
download | op-kernel-dev-f7fa7aeeecb7a9abdd5f5d069a71ffb3e99a2a07.zip op-kernel-dev-f7fa7aeeecb7a9abdd5f5d069a71ffb3e99a2a07.tar.gz |
x86/irq: Avoid memory allocation in __assign_irq_vector()
Function __assign_irq_vector() is protected by vector_lock, so use
a global temporary cpu_mask to avoid allocating/freeing cpu_mask.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: David Cohen <david.a.cohen@linux.intel.com>
Cc: Sander Eikelenboom <linux@eikelenboom.it>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dimitri Sivanich <sivanich@sgi.com>
Link: http://lkml.kernel.org/r/1428978610-28986-34-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/apic/vector.c')
-rw-r--r-- | arch/x86/kernel/apic/vector.c | 33 |
1 files changed, 17 insertions, 16 deletions
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index ad786f8..1c7dd42 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -30,6 +30,7 @@ struct apic_chip_data { struct irq_domain *x86_vector_domain; static DEFINE_RAW_SPINLOCK(vector_lock); +static cpumask_var_t vector_cpumask; static struct irq_chip lapic_controller; #ifdef CONFIG_X86_IO_APIC static struct apic_chip_data *legacy_irq_data[NR_IRQS_LEGACY]; @@ -116,14 +117,10 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START; static int current_offset = VECTOR_OFFSET_START % 16; int cpu, err; - cpumask_var_t tmp_mask; if (d->move_in_progress) return -EBUSY; - if (!alloc_cpumask_var(&tmp_mask, GFP_ATOMIC)) - return -ENOMEM; - /* Only try and allocate irqs on cpus that are present */ err = -ENOSPC; cpumask_clear(d->old_domain); @@ -131,21 +128,22 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, while (cpu < nr_cpu_ids) { int new_cpu, vector, offset; - apic->vector_allocation_domain(cpu, tmp_mask, mask); + apic->vector_allocation_domain(cpu, vector_cpumask, mask); - if (cpumask_subset(tmp_mask, d->domain)) { + if (cpumask_subset(vector_cpumask, d->domain)) { err = 0; - if (cpumask_equal(tmp_mask, d->domain)) + if (cpumask_equal(vector_cpumask, d->domain)) break; /* * New cpumask using the vector is a proper subset of * the current in use mask. So cleanup the vector * allocation for the members that are not used anymore. */ - cpumask_andnot(d->old_domain, d->domain, tmp_mask); + cpumask_andnot(d->old_domain, d->domain, + vector_cpumask); d->move_in_progress = cpumask_intersects(d->old_domain, cpu_online_mask); - cpumask_and(d->domain, d->domain, tmp_mask); + cpumask_and(d->domain, d->domain, vector_cpumask); break; } @@ -159,16 +157,18 @@ next: } if (unlikely(current_vector == vector)) { - cpumask_or(d->old_domain, d->old_domain, tmp_mask); - cpumask_andnot(tmp_mask, mask, d->old_domain); - cpu = cpumask_first_and(tmp_mask, cpu_online_mask); + cpumask_or(d->old_domain, d->old_domain, + vector_cpumask); + cpumask_andnot(vector_cpumask, mask, d->old_domain); + cpu = cpumask_first_and(vector_cpumask, + cpu_online_mask); continue; } if (test_bit(vector, used_vectors)) goto next; - for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask) { + for_each_cpu_and(new_cpu, vector_cpumask, cpu_online_mask) { if (per_cpu(vector_irq, new_cpu)[vector] > VECTOR_UNDEFINED) goto next; @@ -181,14 +181,13 @@ next: d->move_in_progress = cpumask_intersects(d->old_domain, cpu_online_mask); } - for_each_cpu_and(new_cpu, tmp_mask, cpu_online_mask) + for_each_cpu_and(new_cpu, vector_cpumask, cpu_online_mask) per_cpu(vector_irq, new_cpu)[vector] = irq; d->cfg.vector = vector; - cpumask_copy(d->domain, tmp_mask); + cpumask_copy(d->domain, vector_cpumask); err = 0; break; } - free_cpumask_var(tmp_mask); if (!err) { /* cache destination APIC IDs into cfg->dest_apicid */ @@ -397,6 +396,8 @@ int __init arch_early_irq_init(void) arch_init_msi_domain(x86_vector_domain); arch_init_htirq_domain(x86_vector_domain); + BUG_ON(!alloc_cpumask_var(&vector_cpumask, GFP_KERNEL)); + return arch_early_ioapic_init(); } |