Re: [PATCH] print_dev_t for 2.6.0-test1-mm

From: Greg KH (
Date: Wed Jul 16 2003 - 16:02:54 EST

On Wed, Jul 16, 2003 at 01:09:15PM -0700, Andrew Morton wrote:
> > Here's a patch against 2.6.0-test1-mm that fixes up the different places
> > where we export a dev_t to userspace. This fixes all of the compiler
> > warnings that were previously reported with these files.
> I added this as well:
> static inline char *format_dev_t(char *buffer, dev_t dev)
> {
> sprintf(buffer, "%04lx\n", (unsigned long)dev);
> return buffer;
> }
> tp be placed direct in a printk().


> We'll probably need to do something more fancy in here later, because once
> a dev_t becomes 32:32, it'll need to be printed out with "%016llx", which
> is daft.
> So we'll need to come up with some standardised way of presenting a dev_t
> to the user. Presumably that will just be
> sprintf(buf, "%d:%d", major(dev), minor(dev));
> But if we do this, will it break your existing stuff?

No, I don't think there are any users of udev right now :)

I wouldn't mind the ':' being there, makes my life a bit easier, but for
some reason Al Viro didn't want to do that a long time ago...

If we put the ':' in there, it protects userspace from having to deal
with different sized dev_t, so that really makes sense.


greg k-h
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