diff options
| author | Dawei Li <dawei.li@shingroup.cn> | 2024-04-03 23:59:46 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-04-09 16:47:15 +0100 |
| commit | cf276ee46bc44aa188d6a9ea36f83118f48bac67 (patch) | |
| tree | 890ceaf2de021313d77baa6406fdf2333f1cac76 | |
| parent | bea2a13b207ef48732daf329564101a07df14e3a (diff) | |
| download | linux-cf276ee46bc44aa188d6a9ea36f83118f48bac67.tar.gz | |
perf/dwc_pcie: Avoid placing cpumask on the stack
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.
Use cpumask_any_and_but() to avoid the need for a temporary cpumask on
the stack.
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Dawei Li <dawei.li@shingroup.cn>
Reviewed-by: Shuai Xue <xueshuai@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240403155950.2068109-7-dawei.li@shingroup.cn
Signed-off-by: Will Deacon <will@kernel.org>
| -rw-r--r-- | drivers/perf/dwc_pcie_pmu.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/perf/dwc_pcie_pmu.c b/drivers/perf/dwc_pcie_pmu.c index 957058ad0099e..c5e328f238419 100644 --- a/drivers/perf/dwc_pcie_pmu.c +++ b/drivers/perf/dwc_pcie_pmu.c @@ -690,9 +690,8 @@ static int dwc_pcie_pmu_offline_cpu(unsigned int cpu, struct hlist_node *cpuhp_n { struct dwc_pcie_pmu *pcie_pmu; struct pci_dev *pdev; - int node; - cpumask_t mask; unsigned int target; + int node; pcie_pmu = hlist_entry_safe(cpuhp_node, struct dwc_pcie_pmu, cpuhp_node); /* Nothing to do if this CPU doesn't own the PMU */ @@ -702,10 +701,9 @@ static int dwc_pcie_pmu_offline_cpu(unsigned int cpu, struct hlist_node *cpuhp_n pcie_pmu->on_cpu = -1; pdev = pcie_pmu->pdev; node = dev_to_node(&pdev->dev); - if (cpumask_and(&mask, cpumask_of_node(node), cpu_online_mask) && - cpumask_andnot(&mask, &mask, cpumask_of(cpu))) - target = cpumask_any(&mask); - else + + target = cpumask_any_and_but(cpumask_of_node(node), cpu_online_mask, cpu); + if (target >= nr_cpu_ids) target = cpumask_any_but(cpu_online_mask, cpu); if (target >= nr_cpu_ids) { |