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authorPaul Gortmaker <paul.gortmaker@windriver.com>2017-01-04 15:08:15 -0500
committerAlex Williamson <alex.williamson@redhat.com>2017-01-04 13:22:38 -0700
commitc6ef7fd40eddad38a8825cbd6bb2ce8bdbba88f5 (patch)
treed7b398cea5abb297dbf873d7185dfb87f44f9a01 /include/linux/mdev.h
parente19f32da5ded958238eac1bbe001192acef191a2 (diff)
vfio-mdev: fix non-standard ioctl return val causing i386 build fail
What appears to be a copy and paste error from the line above gets the ioctl a ssize_t return value instead of the traditional "int". The associated sample code used "long" which meant it would compile for x86-64 but not i386, with the latter failing as follows: CC [M] samples/vfio-mdev/mtty.o samples/vfio-mdev/mtty.c:1418:20: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types] .ioctl = mtty_ioctl, ^ samples/vfio-mdev/mtty.c:1418:20: note: (near initialization for ‘mdev_fops.ioctl’) cc1: some warnings being treated as errors Since in this case, vfio is working with struct file_operations; as such: long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); long (*compat_ioctl) (struct file *, unsigned int, unsigned long); ...and so here we just standardize on long vs. the normal int that user space typically sees and documents as per "man ioctl" and similar. Fixes: 9d1a546c53b4 ("docs: Sample driver to demonstrate how to use Mediated device framework.") Cc: Kirti Wankhede <kwankhede@nvidia.com> Cc: Neo Jia <cjia@nvidia.com> Cc: kvm@vger.kernel.org Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'include/linux/mdev.h')
-rw-r--r--include/linux/mdev.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 3ee44b8d2bb3..b6e048e1045f 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -78,7 +78,7 @@ struct mdev_parent_ops {
size_t count, loff_t *ppos);
ssize_t (*write)(struct mdev_device *mdev, const char __user *buf,
size_t count, loff_t *ppos);
- ssize_t (*ioctl)(struct mdev_device *mdev, unsigned int cmd,
+ long (*ioctl)(struct mdev_device *mdev, unsigned int cmd,
unsigned long arg);
int (*mmap)(struct mdev_device *mdev, struct vm_area_struct *vma);
};