On 01.07.22 23:00, Samuel Holland wrote: Hello Samuel
Some architectures and irqchip drivers modify the cpumask returned by irq_data_get_affinity_mask, usually by copying in to it. This is problematic for uniprocessor configurations, where the affinity mask should be constant, as it is known at compile time. Add and use a setter for the affinity mask, following the pattern of irq_data_update_effective_affinity. This allows the getter function to return a const cpumask pointer. Signed-off-by: Samuel Holland <samuel@xxxxxxxxxxxx> --- Changes in v3: - New patch to introduce irq_data_update_affinity arch/alpha/kernel/irq.c | 2 +- arch/ia64/kernel/iosapic.c | 2 +- arch/ia64/kernel/irq.c | 4 ++-- arch/ia64/kernel/msi_ia64.c | 4 ++-- arch/parisc/kernel/irq.c | 2 +- drivers/irqchip/irq-bcm6345-l1.c | 4 ++-- drivers/parisc/iosapic.c | 2 +- drivers/sh/intc/chip.c | 2 +- drivers/xen/events/events_base.c | 7 ++++--- include/linux/irq.h | 6 ++++++ 10 files changed, 21 insertions(+), 14 deletions(-) diff --git a/arch/alpha/kernel/irq.c b/arch/alpha/kernel/irq.c index f6d2946edbd2..15f2effd6baf 100644 --- a/arch/alpha/kernel/irq.c +++ b/arch/alpha/kernel/irq.c @@ -60,7 +60,7 @@ int irq_select_affinity(unsigned int irq) cpu = (cpu < (NR_CPUS-1) ? cpu + 1 : 0); last_cpu = cpu;- cpumask_copy(irq_data_get_affinity_mask(data), cpumask_of(cpu));+ irq_data_update_affinity(data, cpumask_of(cpu)); chip->irq_set_affinity(data, cpumask_of(cpu), false); return 0; } diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c index 35adcf89035a..99300850abc1 100644 --- a/arch/ia64/kernel/iosapic.c +++ b/arch/ia64/kernel/iosapic.c @@ -834,7 +834,7 @@ iosapic_unregister_intr (unsigned int gsi) if (iosapic_intr_info[irq].count == 0) { #ifdef CONFIG_SMP /* Clear affinity */ - cpumask_setall(irq_get_affinity_mask(irq)); + irq_data_update_affinity(irq_get_irq_data(irq), cpu_all_mask); #endif /* Clear the interrupt information */ iosapic_intr_info[irq].dest = 0; diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c index ecef17c7c35b..275b9ea58c64 100644 --- a/arch/ia64/kernel/irq.c +++ b/arch/ia64/kernel/irq.c @@ -57,8 +57,8 @@ static char irq_redir [NR_IRQS]; // = { [0 ... NR_IRQS-1] = 1 }; void set_irq_affinity_info (unsigned int irq, int hwid, int redir) { if (irq < NR_IRQS) { - cpumask_copy(irq_get_affinity_mask(irq), - cpumask_of(cpu_logical_id(hwid))); + irq_data_update_affinity(irq_get_irq_data(irq), + cpumask_of(cpu_logical_id(hwid))); irq_redir[irq] = (char) (redir & 0xff); } } diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c index df5c28f252e3..025e5133c860 100644 --- a/arch/ia64/kernel/msi_ia64.c +++ b/arch/ia64/kernel/msi_ia64.c @@ -37,7 +37,7 @@ static int ia64_set_msi_irq_affinity(struct irq_data *idata, msg.data = data;pci_write_msi_msg(irq, &msg);- cpumask_copy(irq_data_get_affinity_mask(idata), cpumask_of(cpu)); + irq_data_update_affinity(idata, cpumask_of(cpu));return 0;} @@ -132,7 +132,7 @@ static int dmar_msi_set_affinity(struct irq_data *data, msg.address_lo |= MSI_ADDR_DEST_ID_CPU(cpu_physical_id(cpu));dmar_msi_write(irq, &msg);- cpumask_copy(irq_data_get_affinity_mask(data), mask); + irq_data_update_affinity(data, mask);return 0;} diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c index 0fe2d79fb123..5ebb1771b4ab 100644 --- a/arch/parisc/kernel/irq.c +++ b/arch/parisc/kernel/irq.c @@ -315,7 +315,7 @@ unsigned long txn_affinity_addr(unsigned int irq, int cpu) { #ifdef CONFIG_SMP struct irq_data *d = irq_get_irq_data(irq); - cpumask_copy(irq_data_get_affinity_mask(d), cpumask_of(cpu)); + irq_data_update_affinity(d, cpumask_of(cpu)); #endifreturn per_cpu(cpu_data, cpu).txn_addr;diff --git a/drivers/irqchip/irq-bcm6345-l1.c b/drivers/irqchip/irq-bcm6345-l1.c index 142a7431745f..6899e37810a8 100644 --- a/drivers/irqchip/irq-bcm6345-l1.c +++ b/drivers/irqchip/irq-bcm6345-l1.c @@ -216,11 +216,11 @@ static int bcm6345_l1_set_affinity(struct irq_data *d, enabled = intc->cpus[old_cpu]->enable_cache[word] & mask; if (enabled) __bcm6345_l1_mask(d); - cpumask_copy(irq_data_get_affinity_mask(d), dest); + irq_data_update_affinity(d, dest); if (enabled) __bcm6345_l1_unmask(d); } else { - cpumask_copy(irq_data_get_affinity_mask(d), dest); + irq_data_update_affinity(d, dest); } raw_spin_unlock_irqrestore(&intc->lock, flags);diff --git a/drivers/parisc/iosapic.c b/drivers/parisc/iosapic.cindex 8a3b0c3a1e92..3a8c98615634 100644 --- a/drivers/parisc/iosapic.c +++ b/drivers/parisc/iosapic.c @@ -677,7 +677,7 @@ static int iosapic_set_affinity_irq(struct irq_data *d, if (dest_cpu < 0) return -1;- cpumask_copy(irq_data_get_affinity_mask(d), cpumask_of(dest_cpu));+ irq_data_update_affinity(d, cpumask_of(dest_cpu)); vi->txn_addr = txn_affinity_addr(d->irq, dest_cpu);spin_lock_irqsave(&iosapic_lock, flags);diff --git a/drivers/sh/intc/chip.c b/drivers/sh/intc/chip.c index 358df7510186..828d81e02b37 100644 --- a/drivers/sh/intc/chip.c +++ b/drivers/sh/intc/chip.c @@ -72,7 +72,7 @@ static int intc_set_affinity(struct irq_data *data, if (!cpumask_intersects(cpumask, cpu_online_mask)) return -1;- cpumask_copy(irq_data_get_affinity_mask(data), cpumask);+ irq_data_update_affinity(data, cpumask);return IRQ_SET_MASK_OK_NOCOPY;} diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index 46d9295d9a6e..5e8321f43cbd 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -528,9 +528,10 @@ static void bind_evtchn_to_cpu(evtchn_port_t evtchn, unsigned int cpu, BUG_ON(irq == -1);if (IS_ENABLED(CONFIG_SMP) && force_affinity) {- cpumask_copy(irq_get_affinity_mask(irq), cpumask_of(cpu)); - cpumask_copy(irq_get_effective_affinity_mask(irq), - cpumask_of(cpu)); + struct irq_data *data = irq_get_irq_data(irq); + + irq_data_update_affinity(data, cpumask_of(cpu)); + irq_data_update_effective_affinity(data, cpumask_of(cpu)); }
Nit: commit description says about reusing irq_data_update_affinity() only, but here we also reuse irq_data_update_effective_affinity(), so I would mention that in the description.
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx> # Xen bits [snip] -- Regards, Oleksandr Tyshchenko