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sparc/irq: Remove on-stack cpumask var

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In general it's preferable to avoid placing cpumasks on the stack, as
for large values of NR_CPUS these can consume significant amounts of
stack space and make stack overflows more likely.

- Both 2 arguments of cpumask_equal() is constant and free of change, no
  need to allocate extra cpumask variables.

- Merge cpumask_and(), cpumask_first() and cpumask_empty() into
  cpumask_first_and().

Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
Reviewed-by: Andreas Larsson <andreas@gaisler.com>
Link: https://lore.kernel.org/r/20240424025548.3765250-3-dawei.li@shingroup.cn
Signed-off-by: Andreas Larsson <andreas@gaisler.com>
This commit is contained in:
Dawei Li 2024-04-24 10:55:45 +08:00 committed by Andreas Larsson
parent 7aba3a85da
commit c4650ba96c
1 changed files with 3 additions and 7 deletions
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10
arch/sparc/kernel/irq_64.c
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@ -349,17 +349,13 @@ static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid)
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
static int irq_choose_cpu(unsigned int irq, const struct cpumask *affinity) static int irq_choose_cpu(unsigned int irq, const struct cpumask *affinity)
{ {
cpumask_t mask;
int cpuid; int cpuid;
cpumask_copy(&mask, affinity); if (cpumask_equal(affinity, cpu_online_mask)) {
if (cpumask_equal(&mask, cpu_online_mask)) {
cpuid = map_to_cpu(irq); cpuid = map_to_cpu(irq);
} else { } else {
cpumask_t tmp; cpuid = cpumask_first_and(affinity, cpu_online_mask);
cpuid = cpuid < nr_cpu_ids ? cpuid : map_to_cpu(irq);
cpumask_and(&tmp, cpu_online_mask, &mask);
cpuid = cpumask_empty(&tmp) ? map_to_cpu(irq) : cpumask_first(&tmp);
} }
return cpuid; return cpuid;