kvm: vfio: silence GCC warning

Building vfio.o triggers a GCC warning (when building for 32 bits x86):
    arch/x86/kvm/../../../virt/kvm/vfio.c: In function 'kvm_vfio_set_group':
    arch/x86/kvm/../../../virt/kvm/vfio.c:104:22: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
      void __user *argp = (void __user *)arg;
                          ^

Silence this warning by casting arg to unsigned long.

argp's current type, "void __user *", is always casted to "int32_t
__user *". So its type might as well be changed to "int32_t __user *".

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index ca4260e35037..b4f9507ae650 100644
--- a/virt/kvm/vfio.c
+++ b/virt/kvm/vfio.c
@@ -101,14 +101,14 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
         struct kvm_vfio *kv = dev->private;
         struct vfio_group *vfio_group;
         struct kvm_vfio_group *kvg;
-        void __user *argp = (void __user *)arg;
+        int32_t __user *argp = (int32_t __user *)(unsigned long)arg;
         struct fd f;
         int32_t fd;
         int ret;
 
         switch (attr) {
         case KVM_DEV_VFIO_GROUP_ADD:
-                if (get_user(fd, (int32_t __user *)argp))
+                if (get_user(fd, argp))
                         return -EFAULT;
 
                 f = fdget(fd);
@@ -148,7 +148,7 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
                 return 0;
 
         case KVM_DEV_VFIO_GROUP_DEL:
-                if (get_user(fd, (int32_t __user *)argp))
+                if (get_user(fd, argp))
                         return -EFAULT;
 
                 f = fdget(fd);