Martin Natano wrote:
> 0 is the same as UIO_USERSPACE, but more readable. No binary change.

Makes sense. The entire tree uses the symbolic enum values.
These are the only places that use 0.
 
> Index: ./arch/octeon/dev/amdcf.c
> ===================================================================
> RCS file: /cvs/src/sys/arch/octeon/dev/amdcf.c,v
> retrieving revision 1.1
> diff -u -p -u -r1.1 amdcf.c
> --- ./arch/octeon/dev/amdcf.c 20 Jul 2015 19:44:32 -0000      1.1
> +++ ./arch/octeon/dev/amdcf.c 9 Jan 2016 17:56:04 -0000
> @@ -548,7 +548,7 @@ amdcfioctl(dev_t dev, u_long xfer, caddr
>               auio.uio_iov = &aiov;
>               auio.uio_iovcnt = 1;
>               auio.uio_resid = fop->df_count;
> -             auio.uio_segflg = 0;
> +             auio.uio_segflg = UIO_USERSPACE;
>               auio.uio_offset =
>                       fop->df_startblk * sc->sc_dk.dk_label->d_secsize;
>               auio.uio_procp = p;
> Index: ./arch/octeon/dev/octcf.c
> ===================================================================
> RCS file: /cvs/src/sys/arch/octeon/dev/octcf.c,v
> retrieving revision 1.27
> diff -u -p -u -r1.27 octcf.c
> --- ./arch/octeon/dev/octcf.c 20 Jul 2015 01:38:31 -0000      1.27
> +++ ./arch/octeon/dev/octcf.c 9 Jan 2016 17:56:09 -0000
> @@ -616,7 +616,7 @@ octcfioctl(dev_t dev, u_long xfer, caddr
>               auio.uio_iov = &aiov;
>               auio.uio_iovcnt = 1;
>               auio.uio_resid = fop->df_count;
> -             auio.uio_segflg = 0;
> +             auio.uio_segflg = UIO_USERSPACE;
>               auio.uio_offset =
>                       fop->df_startblk * wd->sc_dk.dk_label->d_secsize;
>               auio.uio_procp = p;
> Index: ./dev/ata/wd.c
> ===================================================================
> RCS file: /cvs/src/sys/dev/ata/wd.c,v
> retrieving revision 1.119
> diff -u -p -u -r1.119 wd.c
> --- ./dev/ata/wd.c    26 Aug 2015 22:29:39 -0000      1.119
> +++ ./dev/ata/wd.c    9 Jan 2016 17:56:10 -0000
> @@ -836,7 +836,7 @@ wdioctl(dev_t dev, u_long xfer, caddr_t 
>               auio.uio_iov = &aiov;
>               auio.uio_iovcnt = 1;
>               auio.uio_resid = fop->df_count;
> -             auio.uio_segflg = 0;
> +             auio.uio_segflg = UIO_USERSPACE;
>               auio.uio_offset =
>                       fop->df_startblk * wd->sc_dk.dk_label->d_secsize;
>               auio.uio_procp = p;
> 
> cheers,
> natano
> 

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