* [PATCH v1 1/1] iommu/vt-d: Don't cast parameter in for_each_set_bit()
@ 2022-02-09 17:49 Andy Shevchenko
2022-02-10 1:19 ` Lu Baolu
0 siblings, 1 reply; 2+ messages in thread
From: Andy Shevchenko @ 2022-02-09 17:49 UTC (permalink / raw)
To: Joerg Roedel, Lu Baolu, iommu, linux-kernel
Cc: David Woodhouse, Joerg Roedel, Will Deacon, Andy Shevchenko
While in this particular case it would not be a (critical) issue,
the pattern itself is bad and error prone in case the location
of the parameter is changed.
Don't cast parameter to unsigned long pointer in for_each_set_bit().
Instead copy to a local variable on stack of a proper type and use.
Fixes: 6ee1b77ba3ac ("iommu/vt-d: Add svm/sva invalidate function")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/iommu/intel/iommu.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 92fea3fbbb11..777e81b8f4f5 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4973,6 +4973,7 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev,
struct dmar_domain *dmar_domain = to_dmar_domain(domain);
struct device_domain_info *info;
struct intel_iommu *iommu;
+ unsigned long cache_bits;
unsigned long flags;
int cache_type;
u8 bus, devfn;
@@ -5008,9 +5009,8 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev,
size = to_vtd_size(inv_info->granu.addr_info.granule_size,
inv_info->granu.addr_info.nb_granules);
- for_each_set_bit(cache_type,
- (unsigned long *)&inv_info->cache,
- IOMMU_CACHE_INV_TYPE_NR) {
+ cache_bits = inv_info->cache;
+ for_each_set_bit(cache_type, &cache_bits, IOMMU_CACHE_INV_TYPE_NR) {
int granu = 0;
u64 pasid = 0;
u64 addr = 0;
--
2.34.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v1 1/1] iommu/vt-d: Don't cast parameter in for_each_set_bit()
2022-02-09 17:49 [PATCH v1 1/1] iommu/vt-d: Don't cast parameter in for_each_set_bit() Andy Shevchenko
@ 2022-02-10 1:19 ` Lu Baolu
0 siblings, 0 replies; 2+ messages in thread
From: Lu Baolu @ 2022-02-10 1:19 UTC (permalink / raw)
To: Andy Shevchenko, Joerg Roedel, iommu, linux-kernel
Cc: baolu.lu, David Woodhouse, Joerg Roedel, Will Deacon
Hi Andy,
On 2/10/22 1:49 AM, Andy Shevchenko wrote:
> While in this particular case it would not be a (critical) issue,
> the pattern itself is bad and error prone in case the location
> of the parameter is changed.
>
> Don't cast parameter to unsigned long pointer in for_each_set_bit().
> Instead copy to a local variable on stack of a proper type and use.
>
> Fixes: 6ee1b77ba3ac ("iommu/vt-d: Add svm/sva invalidate function")
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---
> drivers/iommu/intel/iommu.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 92fea3fbbb11..777e81b8f4f5 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -4973,6 +4973,7 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev,
> struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> struct device_domain_info *info;
> struct intel_iommu *iommu;
> + unsigned long cache_bits;
> unsigned long flags;
> int cache_type;
> u8 bus, devfn;
> @@ -5008,9 +5009,8 @@ intel_iommu_sva_invalidate(struct iommu_domain *domain, struct device *dev,
> size = to_vtd_size(inv_info->granu.addr_info.granule_size,
> inv_info->granu.addr_info.nb_granules);
>
> - for_each_set_bit(cache_type,
> - (unsigned long *)&inv_info->cache,
> - IOMMU_CACHE_INV_TYPE_NR) {
> + cache_bits = inv_info->cache;
> + for_each_set_bit(cache_type, &cache_bits, IOMMU_CACHE_INV_TYPE_NR) {
> int granu = 0;
> u64 pasid = 0;
> u64 addr = 0;
Thanks for your patch. The function that you are changing becomes dead
code (nobody uses it and there's no plan to use it anymore) now. I
already have a patch to remove this function.
Best regards,
baolu
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