diff options
| author | Dawei Li <dawei.li@shingroup.cn> | 2024-04-24 05:55:45 +0300 |
|---|---|---|
| committer | Andreas Larsson <andreas@gaisler.com> | 2024-05-08 20:42:15 +0300 |
| commit | c4650ba96cb01b83cb87fb4eddc2e313ea17f4cb (patch) | |
| tree | 085fe412425f1814c70acc2990c313ff1614e541 /arch/sparc | |
| parent | 7aba3a85daee7d81fbdbccc9d3d9a27dbd4b45aa (diff) | |
| download | linux-c4650ba96cb01b83cb87fb4eddc2e313ea17f4cb.tar.xz | |
sparc/irq: Remove on-stack cpumask var
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>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/kernel/irq_64.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c index 5280e325d4d6..01ee800efde3 100644 --- a/arch/sparc/kernel/irq_64.c +++ b/arch/sparc/kernel/irq_64.c @@ -349,17 +349,13 @@ static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid) #ifdef CONFIG_SMP static int irq_choose_cpu(unsigned int irq, const struct cpumask *affinity) { - cpumask_t mask; int cpuid; - cpumask_copy(&mask, affinity); - if (cpumask_equal(&mask, cpu_online_mask)) { + if (cpumask_equal(affinity, cpu_online_mask)) { cpuid = map_to_cpu(irq); } else { - cpumask_t tmp; - - cpumask_and(&tmp, cpu_online_mask, &mask); - cpuid = cpumask_empty(&tmp) ? map_to_cpu(irq) : cpumask_first(&tmp); + cpuid = cpumask_first_and(affinity, cpu_online_mask); + cpuid = cpuid < nr_cpu_ids ? cpuid : map_to_cpu(irq); } return cpuid; |