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@xxxxxxxxxx>
---
Compile tested on both 32 and 64 bits x86. I've no KVM capable hardware
that is already running v3.13-rc* at hand. Besides, I wouldn't know how
to test the codepaths I'm changing here.
virt/kvm/vfio.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index ca4260e..b4f9507 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);
--
1.8.4.2
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