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[patch 08/30] genirq: Provide kstat_irqdesc_cpu()
- To: LKML <linux-kernel@xxxxxxxxxxxxxxx>
- From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- Date: Thu, 10 Dec 2020 20:25:44 +0100
- Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, "James E.J. Bottomley" <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>, Helge Deller <deller@xxxxxx>, afzal mohammed <afzal.mohd.ma@xxxxxxxxx>, linux-parisc@xxxxxxxxxxxxxxx, Russell King <linux@xxxxxxxxxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, Mark Rutland <mark.rutland@xxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxx>, Heiko Carstens <hca@xxxxxxxxxxxxx>, linux-s390@xxxxxxxxxxxxxxx, Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>, Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>, Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>, David Airlie <airlied@xxxxxxxx>, Daniel Vetter <daniel@xxxxxxxx>, Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@xxxxxxxxx>, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>, Wambui Karuga <wambui.karugax@xxxxxxxxx>, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>, Linus Walleij <linus.walleij@xxxxxxxxxx>, linux-gpio@xxxxxxxxxxxxxxx, Lee Jones <lee.jones@xxxxxxxxxx>, Jon Mason <jdmason@xxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, Allen Hubbe <allenbh@xxxxxxxxx>, linux-ntb@xxxxxxxxxxxxxxxx, Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>, Rob Herring <robh@xxxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Michal Simek <michal.simek@xxxxxxxxxx>, linux-pci@xxxxxxxxxxxxxxx, Karthikeyan Mitran <m.karthikeyan@xxxxxxxxxxxxxx>, Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>, Tariq Toukan <tariqt@xxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, netdev@xxxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, Saeed Mahameed <saeedm@xxxxxxxxxx>, Leon Romanovsky <leon@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 10 Dec 2020 19:42:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Most users of kstat_irqs_cpu() have the irq descriptor already. No point in
calling into the core code and looking it up once more.
Use it in per_cpu_count_show() to start with.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/irqdesc.h | 6 ++++++
kernel/irq/irqdesc.c | 4 ++--
2 files changed, 8 insertions(+), 2 deletions(-)
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -113,6 +113,12 @@ static inline void irq_unlock_sparse(voi
extern struct irq_desc irq_desc[NR_IRQS];
#endif
+static inline unsigned int irq_desc_kstat_cpu(struct irq_desc *desc,
+ unsigned int cpu)
+{
+ return desc->kstat_irqs ? *per_cpu_ptr(desc->kstat_irqs, cpu) : 0;
+}
+
static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
{
return container_of(data->common, struct irq_desc, irq_common_data);
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -147,12 +147,12 @@ static ssize_t per_cpu_count_show(struct
struct kobj_attribute *attr, char *buf)
{
struct irq_desc *desc = container_of(kobj, struct irq_desc, kobj);
- int cpu, irq = desc->irq_data.irq;
ssize_t ret = 0;
char *p = "";
+ int cpu;
for_each_possible_cpu(cpu) {
- unsigned int c = kstat_irqs_cpu(irq, cpu);
+ unsigned int c = irq_desc_kstat_cpu(desc, cpu);
ret += scnprintf(buf + ret, PAGE_SIZE - ret, "%s%u", p, c);
p = ",";
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