linux-kernel - Re: [PATCH] Change userspace MKDEV, MAJOR, MINOR-macros from 8+8 bit, to 12+20 bit layout

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Message-ID: <20140914174622.GA10315@kroah.com>
Date:	Sun, 14 Sep 2014 10:46:22 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Stephan Müller <fruktopus@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-api@...r.kernel.org
Subject: Re: [PATCH] Change userspace MKDEV, MAJOR, MINOR-macros from 8+8
 bit, to 12+20 bit layout

On Sun, Sep 14, 2014 at 07:35:28PM +0200, Stephan Müller wrote:
> Delete old userspace-only versions (8+8 bit). Instead expose the kernel-space
> definitions (12+20 bit).
> 
> Signed-off-by: Stephan Mueller <fruktopus@...il.com>
> ---
> 
> Browsing some code I found that user-space and kernel-space macros for (un-)packing major/minor device numbers differ. The user-space ones using still the old 16 bit scheme. There was no explaining comment around and most libraries have their own macros anyway so it should not be a problematic UAPI change. So IMHO we could win some coherence in abandon this discrepancy.
> Please correct me if I am wrong.

You are wrong, we can't change this api, things will break :(

sorry,

greg k-h
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