[PATCH v6 02/12] iommu/vt-d: Change flags type to unsigned int in binding mm

Fenghua Yu
2020-07-13T23:48:48Z

"flags" passed to intel_svm_bind_mm() is a bit mask and should be
defined as "unsigned int" instead of "int".

Change its type to "unsigned int".

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
---
v5:
- Reviewed by Lu Baolu

v2:
- Add this new patch per Thomas' comment.

drivers/iommu/intel/svm.c | 7 ++++---
include/linux/intel-iommu.h | 2 +-
2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 778089d198eb..8a0cf2f0dd54 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -427,7 +427,8 @@ int intel_svm_unbind_gpasid(struct device *dev, u32 pasid)

/* Caller must hold pasid_mutex, mm reference */
static int
-intel_svm_bind_mm(struct device *dev, int flags, struct svm_dev_ops *ops,
+intel_svm_bind_mm(struct device *dev, unsigned int flags,
+ struct svm_dev_ops *ops,
struct mm_struct *mm, struct intel_svm_dev **sd)
{
struct intel_iommu *iommu = intel_svm_device_to_iommu(dev);
@@ -954,7 +955,7 @@ intel_svm_bind(struct device *dev, struct mm_struct *mm, void *drvdata)
{
struct iommu_sva *sva = ERR_PTR(-EINVAL);
struct intel_svm_dev *sdev = NULL;
- int flags = 0;
+ unsigned int flags = 0;
int ret;

/*
@@ -963,7 +964,7 @@ intel_svm_bind(struct device *dev, struct mm_struct *mm, void *drvdata)
* and intel_svm etc.
*/
if (drvdata)
- flags = *(int *)drvdata;
+ flags = *(unsigned int *)drvdata;
mutex_lock(&pasid_mutex);
ret = intel_svm_bind_mm(dev, flags, NULL, mm, &sdev);
if (ret)
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 643951e28dd4..d129baf7e0b8 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -760,7 +760,7 @@ struct intel_svm {
struct mm_struct *mm;

struct intel_iommu *iommu;
- int flags;
+ unsigned int flags;
u32 pasid;
int gpasid; /* In case that guest PASID is different from host PASID */
struct list_head devs;
--
2.19.1