diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2022-02-09 19:47:58 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2022-02-15 17:51:26 +0100 |
| commit | 8ddf4eff71e12e4295b54ac8b02439ad22271fd2 (patch) | |
| tree | 796e3ccd8c57fcfe6af7298f135031743832c1e3 /drivers/perf | |
| parent | iommu/arm-smmu-v3: fix event handling soft lockup (diff) | |
| download | linux-8ddf4eff71e12e4295b54ac8b02439ad22271fd2.tar.xz linux-8ddf4eff71e12e4295b54ac8b02439ad22271fd2.zip | |
perf/smmuv3: Don't cast parameter in bit operations
While in this particular case it would not be a (critical) issue,
the pattern itself is bad and error prone in case somebody blindly
copies to their code.
Don't cast parameter to unsigned long pointer in the bit operations.
Instead copy to a local variable on stack of a proper type and use.
Note, new compilers might warn on this line for potential outbound access.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20220209184758.56578-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/arm_smmuv3_pmu.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c index c49108a72865..00d4c45a8017 100644 --- a/drivers/perf/arm_smmuv3_pmu.c +++ b/drivers/perf/arm_smmuv3_pmu.c @@ -654,6 +654,7 @@ static int smmu_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node) static irqreturn_t smmu_pmu_handle_irq(int irq_num, void *data) { struct smmu_pmu *smmu_pmu = data; + DECLARE_BITMAP(ovs, BITS_PER_TYPE(u64)); u64 ovsr; unsigned int idx; @@ -663,7 +664,8 @@ static irqreturn_t smmu_pmu_handle_irq(int irq_num, void *data) writeq(ovsr, smmu_pmu->reloc_base + SMMU_PMCG_OVSCLR0); - for_each_set_bit(idx, (unsigned long *)&ovsr, smmu_pmu->num_counters) { + bitmap_from_u64(ovs, ovsr); + for_each_set_bit(idx, ovs, smmu_pmu->num_counters) { struct perf_event *event = smmu_pmu->events[idx]; struct hw_perf_event *hwc; |