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SubjectRe: [PATCH 2/2] chardev: showing minor range for chardev in the output of /proc/devices
On Tue, Feb 12, 2019 at 11:18:22PM +0800, cgxu519 wrote:
> On 2/12/19 5:02 PM, Greg KH wrote:
> > On Tue, Feb 12, 2019 at 04:47:39PM +0800, Chengguang Xu wrote:
> > > Currently chardev allows to share major, showing
> > > major with minor range for chardev will be more
> > > helpful.
> > >
> > > Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
> > > ---
> > > fs/char_dev.c | 4 +++-
> > > 1 file changed, 3 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/fs/char_dev.c b/fs/char_dev.c
> > > index b25b1da097d5..6f00acdeb308 100644
> > > --- a/fs/char_dev.c
> > > +++ b/fs/char_dev.c
> > > @@ -55,7 +55,9 @@ void chrdev_show(struct seq_file *f, off_t offset)
> > > mutex_lock(&chrdevs_lock);
> > > for (cd = chrdevs[major_to_index(offset)]; cd; cd = cd->next) {
> > > if (cd->major == offset)
> > > - seq_printf(f, "%3d %s\n", cd->major, cd->name);
> > > + seq_printf(f, "%3d %s (%u-%u)\n", cd->major, cd->name,
> > > + cd->baseminor,
> > > + cd->baseminor + cd->minorct - 1);
> > You are changing the format of a userspace file, what tools are going to
> > break when you do this?
>
> I'll remove this part in V2. Do you have any idea how to get the minor
> range info for particular major? Or adding a similar file to somewhere
> under /sys is acceptable?

Why do you need to know the minor range? What can userspace do with
this that actually matters?

thanks,

greg k-h

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