On Wed, Feb 15, 2017 at 12:43:06PM +0800, lixi...@cmss.chinamobile.com wrote: > From: Xiubo Li <lixi...@cmss.chinamobile.com> > > This will allow UIO based drivers, like TCMU, have opportunities to > implement their own mmap magics. > > Signed-off-by: Xiubo Li <lixi...@cmss.chinamobile.com> > --- > drivers/uio/uio.c | 2 ++ > include/linux/uio_driver.h | 1 + > 2 files changed, 3 insertions(+) > > diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c > index fba021f..6ca0ae0 100644 > --- a/drivers/uio/uio.c > +++ b/drivers/uio/uio.c > @@ -708,6 +708,8 @@ static int uio_mmap(struct file *filep, struct > vm_area_struct *vma) > case UIO_MEM_LOGICAL: > case UIO_MEM_VIRTUAL: > return uio_mmap_logical(vma); > + case UIO_MEM_CUSTOM: > + return 0;
How does this help? Can you provide an update to the documentation in Documentation/driver-api/uio-howto.rst to show how to use this? thanks, greg k-h
